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1. The Early Data Release of the Dark Energy Spectroscopic Instrument

Author: DESI Collaboration, A. G. Adame, J. Aguilar, S. Ahlen, S. Alam, G. Aldering, D. M. Alexander, R. Alfarsy, C. Allende Prieto, M. Alvarez, O. Alves, A. Anand, F. Andrade-Oliveira, E. Armengaud, J. Asorey, S. Avila, A. Aviles, S. Bailey, A. Balaguera-Antolínez, O. Ballester, C. Baltay, A. Bault, J. Bautista, J. Behera, S. F. Beltran, S. BenZvi, L. Beraldo e Silva, J. R. Bermejo-Climent, A. Berti, R. Besuner, F. Beutler, D. Bianchi, C. Blake, R. Blum, A. S. Bolton, S. Brieden, A. Brodzeller, D. Brooks, Z. Brown, E. Buckley-Geer, E. Burtin, L. Cabayol-Garcia, Z. Cai, R. Canning, L. Cardiel-Sas, A. Carnero Rosell, F. J. Castander, J. L. Cervantes-Cota, S. Chabanier, E. Chaussidon, J. Chaves-Montero, S. Chen, X. Chen, C. Chuang, T. Claybaugh, S. Cole, A. P. Cooper, A. Cuceu, T. M. Davis, K. Dawson, R. de Belsunce, R. de la Cruz, A. de la Macorra, J. Della Costa, A. de Mattia, R. Demina, U. Demirbozan, J. DeRose, A. Dey, B. Dey, G. Dhungana, J. Ding, Z. Ding, P. Doel, R. Doshi, K. Douglass, A. Edge, S. Eftekharzadeh, D. J. Eisenstein, A. Elliott, J. Ereza, S. Escoffier, P. Fagrelius, X. Fan, K. Fanning, V. A. Fawcett, S. Ferraro, B. Flaugher, A. Font-Ribera, J. E. Forero-Romero, D. Forero-Sánchez, C. S. Frenk, B. T. Gänsicke, L. Á. García, J. García-Bellido, C. Garcia-Quintero, L. H. Garrison, H. Gil-Marín, J. Golden-Marx, S. Gontcho A Gontcho, A. X. Gonzalez-Morales, V. Gonzalez-Perez, C. Gordon, O. Graur, D. Green, D. Gruen, J. Guy, B. Hadzhiyska, C. Hahn, J. J. Han, M. M. S Hanif, H. K. Herrera-Alcantar, K. Honscheid, J. Hou, C. Howlett, D. Huterer, V. Iršič, M. Ishak, A. Jacques, A. Jana, L. Jiang, J. Jimenez, Y. P. Jing, S. Joudaki, R. Joyce, E. Jullo, S. Juneau, N. G. Karaçaylı, T. Karim, R. Kehoe, S. Kent, A. Khederlarian, S. Kim, D. Kirkby, T. Kisner, F. Kitaura, N. Kizhuprakkat, J. Kneib, S. E. Koposov, A. Kovács, A. Kremin, A. Krolewski, B. L’Huillier, O. Lahav, A. Lambert, C. Lamman, T.-W. Lan, M. Landriau, D. Lang, J. U. Lange, J. Lasker, A. Leauthaud, L. Le Guillou, M. E. Levi, T. S. Li, E. Linder, A. Lyons, C. Magneville, M. Manera, C. J. Manser, D. Margala, P. Martini, P. McDonald, G. E. Medina, L. Medina-Varela, A. Meisner, J. Mena-Fernández, J. Meneses-Rizo, M. Mezcua, R. Miquel, P. Montero-Camacho, J. Moon, S. Moore, J. Moustakas, E. Mueller, J. Mundet, A. Muñoz-Gutiérrez, A. D. Myers, S. Nadathur, L. Napolitano, R. Neveux, J. A. Newman, J. Nie, R. Nikutta, G. Niz, P. Norberg, H. E. Noriega, E. Paillas, N. Palanque-Delabrouille, A. Palmese, Z. Pan, D. Parkinson, S. Penmetsa, W. J. Percival, A. Pérez-Fernández, I. Pérez-Ràfols, M. Pieri, C. Poppett, A. Porredon, S. Pothier, F. Prada, R. Pucha, A. Raichoor, C. Ramírez-Pérez, S. Ramirez-Solano, M. Rashkovetskyi, C. Ravoux, A. Rocher, C. Rockosi, A. J. Ross, G. Rossi, R. Ruggeri, V. Ruhlmann-Kleider, C. G. Sabiu, K. Said, A. Saintonge, L. Samushia, E. Sanchez, C. Saulder, E. Schaan, E. F. Schlafly, D. Schlegel, D. Scholte, M. Schubnell, H. Seo, A. Shafieloo, R. Sharples, W. Sheu, J. Silber, F. Sinigaglia, M. Siudek, Z. Slepian, A. Smith, M. T. Soumagnac, D. Sprayberry, L. Stephey, J. Suárez-Pérez, Z. Sun, T. Tan, G. Tarlé, R. Tojeiro, L. A. Ureña-López, R. Vaisakh, D. Valcin, F. Valdes, M. Valluri, M. Vargas-Magaña, A. Variu, L. Verde, M. Walther, B. Wang, M. S. Wang, B. A. Weaver, N. Weaverdyck, R. H. Wechsler, M. White, Y. Xie, J. Yang, C. Yèche, J. Yu, S. Yuan, H. Zhang, Z. Zhang, C. Zhao, Z. Zheng, R. Zhou, Z. Zhou, H. Zou, S. Zou, and Y. Zu
Subjects: Astronomy data reduction, Observational cosmology, Astronomy databases, Astronomy data analysis, Astronomy software, Surveys, Astronomy, QB1-991
Abstract: The Dark Energy Spectroscopic Instrument (DESI) completed its 5 month Survey Validation in 2021 May. Spectra of stellar and extragalactic targets from Survey Validation constitute the first major data sample from the DESI survey. This paper describes the public release of those spectra, the catalogs of derived properties, and the intermediate data products. In total, the public release includes good-quality spectral information from 466,447 objects targeted as part of the Milky Way Survey, 428,758 as part of the Bright Galaxy Survey, 227,318 as part of the Luminous Red Galaxy sample, 437,664 as part of the Emission Line Galaxy sample, and 76,079 as part of the Quasar sample. In addition, the release includes spectral information from 137,148 objects that expand the scope beyond the primary samples as part of a series of secondary programs. Here, we describe the spectral data, data quality, data products, Large-Scale Structure science catalogs, access to the data, and references that provide relevant background to using these spectra.
Published: 2024
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2. Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument

Author: DESI Collaboration, A. G. Adame, J. Aguilar, S. Ahlen, S. Alam, G. Aldering, D. M. Alexander, R. Alfarsy, C. Allende Prieto, M. Alvarez, O. Alves, A. Anand, F. Andrade-Oliveira, E. Armengaud, J. Asorey, S. Avila, A. Aviles, S. Bailey, A. Balaguera-Antolínez, O. Ballester, C. Baltay, A. Bault, J. Bautista, J. Behera, S. F. Beltran, S. BenZvi, L. Beraldo e Silva, J. R. Bermejo-Climent, A. Berti, R. Besuner, F. Beutler, D. Bianchi, C. Blake, R. Blum, A. S. Bolton, S. Brieden, A. Brodzeller, D. Brooks, Z. Brown, E. Buckley-Geer, E. Burtin, L. Cabayol-Garcia, Z. Cai, R. Canning, L. Cardiel-Sas, A. Carnero Rosell, F. J. Castander, J. L. Cervantes-Cota, S. Chabanier, E. Chaussidon, J. Chaves-Montero, S. Chen, X. Chen, C. Chuang, T. Claybaugh, S. Cole, A. P. Cooper, A. Cuceu, T. M. Davis, K. Dawson, R. de Belsunce, R. de la Cruz, A. de la Macorra, A. de Mattia, R. Demina, U. Demirbozan, J. DeRose, A. Dey, B. Dey, G. Dhungana, J. Ding, Z. Ding, P. Doel, R. Doshi, K. Douglass, A. Edge, S. Eftekharzadeh, D. J. Eisenstein, A. Elliott, S. Escoffier, P. Fagrelius, X. Fan, K. Fanning, V. A. Fawcett, S. Ferraro, J. Ereza, B. Flaugher, A. Font-Ribera, D. Forero-Sánchez, J. E. Forero-Romero, C. S. Frenk, B. T. Gänsicke, L. Á. García, J. García-Bellido, C. Garcia-Quintero, L. H. Garrison, H. Gil-Marín, J. Golden-Marx, S. Gontcho A Gontcho, A. X. Gonzalez-Morales, V. Gonzalez-Perez, C. Gordon, O. Graur, D. Green, D. Gruen, J. Guy, B. Hadzhiyska, C. Hahn, J. J. Han, M. M. S Hanif, H. K. Herrera-Alcantar, K. Honscheid, J. Hou, C. Howlett, D. Huterer, V. Iršič, M. Ishak, A. Jana, L. Jiang, J. Jimenez, Y. P. Jing, S. Joudaki, E. Jullo, R. Joyce, S. Juneau, N. Kizhuprakkat, N. G. Karaçaylı, T. Karim, R. Kehoe, S. Kent, A. Khederlarian, S. Kim, D. Kirkby, T. Kisner, F. Kitaura, J. Kneib, S. E. Koposov, A. Kovács, A. Kremin, A. Krolewski, B. L’Huillier, O. Lahav, A. Lambert, C. Lamman, T.-W. Lan, M. Landriau, D. Lang, J. U. Lange, J. Lasker, L. Le Guillou, A. Leauthaud, M. E. Levi, T. S. Li, E. Linder, A. Lyons, C. Magneville, M. Manera, C. J. Manser, D. Margala, P. Martini, P. McDonald, G. E. Medina, L. Medina-Varela, A. Meisner, J. Mena-Fernández, J. Meneses-Rizo, M. Mezcua, R. Miquel, P. Montero-Camacho, J. Moon, S. Moore, J. Moustakas, E. Mueller, J. Mundet, A. Muñoz-Gutiérrez, A. D. Myers, S. Nadathur, L. Napolitano, R. Neveux, J. A. Newman, J. Nie, G. Niz, P. Norberg, H. E. Noriega, E. Paillas, N. Palanque-Delabrouille, A. Palmese, P. Zhiwei, D. Parkinson, S. Penmetsa, W. J. Percival, A. Pérez-Fernández, I. Pérez-Ràfols, M. Pieri, C. Poppett, A. Porredon, F. Prada, R. Pucha, A. Raichoor, C. Ramírez-Pérez, S. Ramirez-Solano, M. Rashkovetskyi, C. Ravoux, A. Rocher, C. Rockosi, A. J. Ross, G. Rossi, R. Ruggeri, V. Ruhlmann-Kleider, C. G. Sabiu, K. Said, A. Saintonge, L. Samushia, E. Sanchez, C. Saulder, E. Schaan, E. F. Schlafly, D. Schlegel, D. Scholte, M. Schubnell, H. Seo, A. Shafieloo, R. Sharples, W. Sheu, J. Silber, F. Sinigaglia, M. Siudek, Z. Slepian, A. Smith, D. Sprayberry, L. Stephey, J. Suárez-Pérez, Z. Sun, T. Tan, G. Tarlé, R. Tojeiro, L. A. Ureña-López, R. Vaisakh, D. Valcin, F. Valdes, M. Valluri, M. Vargas-Magaña, A. Variu, L. Verde, M. Walther, B. Wang, M. S. Wang, B. A. Weaver, N. Weaverdyck, R. H. Wechsler, M. White, Y. Xie, J. Yang, C. Yèche, J. Yu, S. Yuan, H. Zhang, Z. Zhang, C. Zhao, Z. Zheng, R. Zhou, Z. Zhou, H. Zou, S. Zou, and Y. Zu
Subjects: Cosmology, Redshift surveys, Astronomy, QB1-991
Abstract: The Dark Energy Spectroscopic Instrument (DESI) was designed to conduct a survey covering 14,000 deg ^2 over 5 yr to constrain the cosmic expansion history through precise measurements of baryon acoustic oscillations (BAO). The scientific program for DESI was evaluated during a 5 month survey validation (SV) campaign before beginning full operations. This program produced deep spectra of tens of thousands of objects from each of the stellar Milky Way Survey (MWS), Bright Galaxy Survey (BGS), luminous red galaxy (LRG), emission line galaxy (ELG), and quasar target classes. These SV spectra were used to optimize redshift distributions, characterize exposure times, determine calibration procedures, and assess observational overheads for the 5 yr program. In this paper, we present the final target selection algorithms, redshift distributions, and projected cosmology constraints resulting from those studies. We also present a One-Percent Survey conducted at the conclusion of SV covering 140 deg ^2 using the final target selection algorithms with exposures of a depth typical of the main survey. The SV indicates that DESI will be able to complete the full 14,000 deg ^2 program with spectroscopically confirmed targets from the MWS, BGS, LRG, ELG, and quasar programs with total sample sizes of 7.2, 13.8, 7.46, 15.7, and 2.87 million, respectively. These samples will allow exploration of the Milky Way halo, clustering on all scales, and BAO measurements with a statistical precision of 0.28% over the redshift interval z < 1.1, 0.39% over the redshift interval 1.1 < z < 1.9, and 0.46% over the redshift interval 1.9 < z < 3.5.
Published: 2024
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3. Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section

Author: R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, E. Burtin, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, M. Dziewiecki, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, K. Juraskova, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, I.I. Kuznetsov, A. Kveton, A.A. Lednev, E.A. Levchenko, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, M. Pešková, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rogacheva, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, M. Tasevsky, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, A. Vidon, M. Virius, S. Wallner, M. Wilfert, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, and M. Ziembicki
Subjects: Physics, QC1-999
Abstract: We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160GeV/c polarised μ+ and μ− beams of the CERN SPS impinging on a liquid hydrogen target. We determine the dependence of the average of the measured μ+ and μ− cross sections for deeply virtual Compton scattering on the squared four-momentum transfer t from the initial to the final proton. The slope B of the t-dependence is fitted with a single exponential function, which yields B=(4.3±0.6stat|sys−0.3+0.1)(GeV/c)−2. This result can be converted into a transverse extension of partons in the proton, 〈r⊥2〉=(0.58±0.04stat|sys−0.02+0.01±0.04model)fm. For this measurement, the average virtuality of the photon mediating the interaction is 〈Q2〉=1.8(GeV/c)2 and the average value of the Bjorken variable is 〈xBj〉=0.056. Keywords: Quantum chromodynamics, Deep inelastic scattering, Exclusive reactions, Deeply virtual Compton scattering, Generalized Parton Distributions, Proton size, COMPASS
Published: 2019
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4. Corrigendum to 'Odd and even partial waves of ηπ− and η′π− in π−p → η(′)π−p at 191 GeV/c' [Phys. Lett. B 740 (2015) 303–311]

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E.R. Bielert, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, M. Mikhasenko, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Physics, QC1-999
Abstract: In Fig. 5 on p. 311 of our Phys. Lett. B 740 (2015) 303 an adjustment by 180∘ is required for the phases with respect to the L=2,M=1 wave, of the following waves: L=1,3,5 with M=1, and L=2 with M=2. After this correction (Fig. 5 (corrected) below), the extracted partial waves describe the angular distribution of the η(′) in the Gottfried-Jackson (GJ) frame, using Eq. (4) with implicit Condon-Shortley phase convention. The other results of our paper are not affected. The right-handed GJ coordinate system was defined by the z-axis pointing in the direction of the beam in the η(′)π− center-of-mass system and the y-axis pointing in the direction of precoilGJ×pbeamGJ.
Published: 2020
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5. Interplay among transversity induced asymmetries in hadron leptoproduction

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, W.-C. Chang, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, N. d'Hose, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, A. Ferrero, M. Finger, M. Finger Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, N. Horikawa, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, P. Montuenga, A. Nagaytsev, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, G. Pesaro, M. Pesek, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, T. Weisrock, M. Wilfert, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Physics, QC1-999
Abstract: In the fragmentation of a transversely polarized quark several left–right asymmetries are possible for the hadrons in the jet. When only one unpolarized hadron is selected, it exhibits an azimuthal modulation known as the Collins effect. When a pair of oppositely charged hadrons is observed, three asymmetries can be considered, a di-hadron asymmetry and two single hadron asymmetries. In lepton deep inelastic scattering on transversely polarized nucleons all these asymmetries are coupled with the transversity distribution. From the high statistics COMPASS data on oppositely charged hadron-pair production we have investigated for the first time the dependence of these three asymmetries on the difference of the azimuthal angles of the two hadrons. The similarity of transversity induced single and di-hadron asymmetries is discussed. A new analysis of the data allows quantitative relationships to be established among them, providing for the first time strong experimental indication that the underlying fragmentation mechanisms are all driven by a common physical process.
Published: 2016
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6. The spin structure function g1p of the proton and a test of the Bjorken sum rule

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, C. Azevedo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, W.-C. Chang, M. Chiosso, I. Choi, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, A. Ferrero, M. Finger, M. Finger jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse-Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, N. Horikawa, N. d'Hose, C. -Yu Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pesek, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, T. Weisrock, M. Wilfert, R. Windmolders, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Physics, QC1-999
Abstract: New results for the double spin asymmetry A1p and the proton longitudinal spin structure function g1p are presented. They were obtained by the COMPASS Collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH3 target. The data were collected in 2011 and complement those recorded in 2007 at 160 GeV, in particular at lower values of x. They improve the statistical precision of g1p(x) by about a factor of two in the region x≲0.02. A next-to-leading order QCD fit to the g1 world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, ΔΣ, ranging from 0.26 to 0.36, and to a re-evaluation of the first moment of g1p. The uncertainty of ΔΣ is mostly due to the large uncertainty in the present determinations of the gluon helicity distribution. A new evaluation of the Bjorken sum rule based on the COMPASS results for the non-singlet structure function g1NS(x,Q2) yields as ratio of the axial and vector coupling constants |gA/gV|=1.22±0.05 (stat.)±0.10 (syst.), which validates the sum rule to an accuracy of about 9%.
Published: 2016
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7. Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high pT

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, W.-C. Chang, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, R. Joosten, P. Jörg, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, N. Kuchinski, R. Kuhn, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, P. Montuenga, A. Nagaytsev, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, T. Weisrock, M. Wilfert, J. ter Wolbeek, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: COMPASS, Deep inelastic scattering, Double spin asymmetry, High pT, ΔG, Physics, QC1-999
Abstract: We measured the longitudinal double spin asymmetries ALL for single hadron muoproduction off protons and deuterons at photon virtuality Q2
Published: 2016
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8. Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised protons

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E.R. Bielert, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, G. Pesaro, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Physics, QC1-999
Abstract: Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. The Collins asymmetries exhibit in the valence region a non-zero signal for pions and there are hints of non-zero signal also for kaons. The Sivers asymmetries are found to be positive for positive pions and kaons and compatible with zero otherwise.
Published: 2015
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9. Search for exclusive photoproduction of Zc±(3900) at COMPASS

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E.R. Bielert, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Physics, QC1-999
Abstract: A search for the exclusive production of the Zc±(3900) hadron by virtual photons has been performed in the channel Zc±(3900)→J/ψπ±. The data cover the range from 7 GeV to 19 GeV in the centre-of-mass energy of the photon–nucleon system. The full set of the COMPASS data set collected with a muon beam between 2002 and 2011 has been used. An upper limit for the ratio BR(Zc±(3900)→J/ψπ±)×σγN→Zc±(3900)N/σγN→J/ψN of 3.7×10−3 has been established at the confidence level of 90%. Keywords: COMPASS, Zc(3900), Photoproduction, Tetraquark
Published: 2015
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10. Odd and even partial waves of ηπ− and η′π− in π−p→η(′)π−p at 191 GeV/c

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E.R. Bielert, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Physics, QC1-999
Abstract: Exclusive production of ηπ− and η′π− has been studied with a 191 GeV/c π− beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum (L) characteristics in the inspected invariant mass range up to 3 GeV/c2. A striking similarity between the two systems is observed for the L=2,4,6 intensities (scaled by kinematical factors) and the relative phases. The known resonances a2(1320) and a4(2040) are in line with this similarity. In contrast, a strong enhancement of η′π− over ηπ− is found for the L=1,3,5 waves, which carry non-qq¯ quantum numbers. The L=1 intensity peaks at 1.7 GeV/c2 in η′π− and at 1.4 GeV/c2 in ηπ−, the corresponding phase motions with respect to L=2 are different.
Published: 2015
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11. A high-statistics measurement of transverse spin effects in dihadron production from muon–proton semi-inclusive deep-inelastic scattering

Author: C. Adolph, R. Akhunzyanov, M.G. Alekseev, Yu. Alexandrov, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, R. Bertini, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bravar, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Joerg, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, Z. Kral, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, I. Orlov, A.G. Olshevsky, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, M. Pesek, D. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, G. Reicherz, E. Rocco, V. Rodionov, E. Rondio, A. Rychter, N.S. Rossiyskaya, D.I. Ryabchikov, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, A. Schmidt, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, J. Vondra, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, and M. Ziembicki
Subjects: Physics, QC1-999
Abstract: A measurement of the azimuthal asymmetry in dihadron production in deep-inelastic scattering of muons on transversely polarised proton (NH3) targets is presented. They provide independent access to the transversity distribution functions through the measurement of the Collins asymmetry in single hadron production. The data were taken in the year 2010 with the COMPASS spectrometer using a 160 GeV/c muon beam of the CERN SPS, increasing by a factor of about four the overall statistics with respect to the previously published data taken in the year 2007. The measured sizeable asymmetry is in good agreement with the published data. An approximate equality of the Collins asymmetry and the dihadron asymmetry is observed, suggesting a common physical mechanism in the underlying fragmentation.
Published: 2014
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12. Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, Yu. Alexandrov, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, R. Bertini, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bravar, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Joerg, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, Z. Kral, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, I. Orlov, A.G. Olshevsky, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, M. Pesek, D. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, G. Reicherz, E. Rocco, V. Rodionov, E. Rondio, A. Rychter, N.S. Rossiyskaya, D.I. Ryabchikov, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, A. Schmidt, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szableski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, J. Vondra, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, and M. Ziembicki
Subjects: Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS longitudinally polarised muon beam at 160 GeV/c and a 6LiD target. The amplitudes of the three azimuthal modulations cos⁡ϕh, cos⁡2ϕh and sin⁡ϕh were obtained binning the data separately in each of the relevant kinematic variables x, z or pTh and binning in a three-dimensional grid of these three variables. The amplitudes of the cos⁡ϕh and cos⁡2ϕh modulations show strong kinematic dependencies both for positive and negative hadrons.
Published: 2014
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13. Spin alignment and violation of the OZI rule in exclusive ω and ϕ production in pp collisions

Author: C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Joerg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, M. Sapozhnikov, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szableski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink
Subjects: Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Exclusive production of the isoscalar vector mesons ω and ϕ is measured with a 190 GeV/c proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable xF of the fast proton. A significant violation of the OZI rule is found, confirming earlier findings. Its kinematic dependence on xF and on the invariant mass MpV of the system formed by fast proton pfast and vector meson V is discussed in terms of diffractive production of pfastV resonances in competition with central production. The measurement of the spin density matrix element ρ00 of the vector mesons in different selected reference frames provides another handle to distinguish the contributions of these two major reaction types. Again, dependences of the alignment on xF and on MpV are found. Most of the observations can be traced back to the existence of several excited baryon states contributing to ω production which are absent in the case of the ϕ meson. Removing the low-mass MpV resonant region, the OZI rule is found to be violated by a factor of eight, independently of xF.
Published: 2014
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14. Corrigendum to 'Odd and even partial waves of ηπ− and η′π− in π−p → η(′)π−p at 191 GeV/c' [Phys. Lett. B 740 (2015) 303–311]

Author: S. Takekawa, L. Steiger, E. M. Kabuß, R. Panknin, I.A. Savin, N.S. Rossiyskaya, A. Srnka, A. Grasso, Frank Klein, Yu. Kisselev, M. Ostrick, E.R. Bielert, M. Boer, S. Ramos, M. Wilfert, S.-U. Chung, F. Tessarotto, J. Pretz, S.S. Dasgupta, S. Neubert, V. Anosov, S. Gerassimov, D.V. Peshekhonov, C. Quintans, N. Horikawa, M. Büchele, P. Sznajder, H. Wollny, P. Jörg, M. V. Zavertyaev, François Herrmann, Yu. Ivanshin, O.Yu. Shevchenko, S. Levorato, C. Braun, Z.V. Kroumchtein, B. Badelek, M. Stolarski, J.H. Koivuniemi, T. Iwata, M. Krämer, T. Szameitat, Asher Berlin, Fabrice Gautheron, S. Tessaro, D. Hahne, C. Marchand, D.I. Ryabchikov, M. A. Faessler, M. Gorzellik, Ch. Höppner, T. Nagel, A. Lehmann, C. Regali, O. Kouznetsov, K. Königsmann, Miroslav Sulc, R. Joosten, F. Hinterberger, B. Ketzer, R. Sulej, Yu.A. Khokhlov, J. Novy, A. Rychter, M. Chiosso, Franco Bradamante, F. Haas, O.P. Gavrichtchouk, I. Gnesi, Martin Bodlak, R. Hashimoto, R.P. Kurjata, M. Slunecka, R. Akhunzyanov, Y. Miyachi, L. Sinha, K. Klimaszewski, T. Matsuda, R. Geyer, M. Ziembicki, M. Finger, S. Sarkar, Laura Silva, A. Maggiora, A. Zink, I. Konorov, B. Gobbo, G. D. Alexeev, Aram Kotzinian, W. Dünnweber, V.N. Kolosov, K. Schönning, A.A. Lednev, K. Kurek, W. Meyer, Maria Liz Crespo, Lei Wang, M. Virius, T. Michigami, V. Jary, F. H. Heinsius, Federica Sozzi, S. Schopferer, R. Windmolders, Andres Cicuttin, I. Orlov, V.D. Samoylenko, G. Reicherz, L. Capozza, K. Kondo, S. Goertz, P. Schiavon, Mikhail Mikhasenko, S. Grabmüller, K. Bicker, A.B. Ivanov, S. V. Donskov, A. Magnon, Y. Bedfer, S. Sosio, O.Yu. Denisov, F. Kunne, R. Jahn, S. Dalla Torre, V. Duic, A. Sandacz, Alessandro Bressan, D. von Harrach, A. Austregesilo, C. Elia, G.V. Khaustov, G. Baum, G.V. Meshcheryakov, A.S. Nunes, Bakur Parsamyan, P.D. Eversheim, W. Eyrich, P. Jasinski, D. Panzieri, Janusz Marzec, M.G. Alexeev, S. Uhl, R. Beck, B. Grube, H. Suzuki, Nour Makke, J. Bieling, H. Matsuda, T. Grussenmeyer, M. Quaresma, Michal Dziewiecki, S. Platchkov, Yu. V. Mikhailov, Christian Schill, J. ter Wolbeek, C. Franco, J. Pochodzalla, Jan Matousek, S. Sirtl, A.G. Olshevsky, Andrea Ferrero, F. Nerling, Q. Curiel, R. Birsa, J. Lichtenstadt, M. Levillain, D. Neyret, W.-D. Nowak, H. Schmieden, P. Bordalo, F. Thibaud, J. Barth, V. Frolov, Soumen Paul, J.M. Friedrich, N. Kuchinski, J. Bisplinghoff, Gerhard K. Mallot, K. Schmidt, Norihiro Doshita, S. Huber, Matthias Schott, Anne-Laure Martin, T. Weisrock, N. d'Hose, E. Zemlyanichkina, E. Burtin, V.F. Konstantinov, S. Ishimoto, H. Fischer, V. Andrieux, Adam Szabelski, A. Nagaytsev, F. Balestra, K. Zaremba, V.A. Polyakov, G. Sbrizzai, A. Amoroso, N. du Fresne von Hohenesche, T. Schlüter, E. Rocco, C. Adolph, Johannes Bernhard, A.V. Efremov, A. Guskov, and I. Uman
Subjects: Physics, Nuclear and High Energy Physics, Angular distribution, Recoil, Coordinate system, Phase (waves), Atomic physics, Beam (structure), lcsh:Physics, lcsh:QC1-999
Abstract: In Fig. 5 on p. 311 of our Phys. Lett. B 740 (2015) 303 an adjustment by 180 ∘ is required for the phases with respect to the L = 2 , M = 1 wave, of the following waves: L = 1 , 3 , 5 with M = 1 , and L = 2 with M = 2 . After this correction (Fig. 5 (corrected) below), the extracted partial waves describe the angular distribution of the η ( ′ ) in the Gottfried-Jackson (GJ) frame, using Eq. (4) with implicit Condon-Shortley phase convention. The other results of our paper are not affected. The right-handed GJ coordinate system was defined by the z-axis pointing in the direction of the beam in the η ( ′ ) π − center-of-mass system and the y-axis pointing in the direction of p recoil GJ × p beam GJ .
Published: 2020

15. Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section

Author: C. Quintans, A. Vidon, N. C. R. Makins, E. Fuchey, M. V. Zavertyaev, Nikolay Anfimov, Mikhail Mikhasenko, K. Zaremba, V.A. Polyakov, Y.-S. Lian, Franco Bradamante, R. Joosten, C. Marchand, Alexandr Selyunin, G. Sbrizzai, Jan Matousek, G. Reicherz, M. Levillain, C.-Y. Hsieh, B. Grube, V. Frolov, A. Amoroso, N. du Fresne von Hohenesche, C. Riedl, Aram Kotzinian, Nour Makke, W. C. Chang, S.A. Mamon, P. Schiavon, Soumen Paul, V. Andrieux, H. Schmieden, J.M. Friedrich, Adam Szabelski, S. V. Donskov, M. Pešek, A. Srnka, Z.V. Kroumchtein, M. Quaresma, S.-U. Chung, S. Huber, I. J. Choi, A.S. Nunes, P.D. Eversheim, W. Duennweber, J. Pochodzalla, R. Akhunzyanov, T. Sawada, J. Novy, D. Panzieri, Janusz Marzec, K. Schoennig, R.P. Kurjata, H. Suzuki, C.D.R. Azevedo, H. Matsuda, Ilya Kuznetsov, S. Platchkov, M. Faessler, M. Stolarski, François Herrmann, D.V. Peshekhonov, B.I. Vasilishin, M. Virius, T. Grussenmeyer, F. Tessarotto, E. Zemlyanichkina, P. Bordalo, A. Nagaytsev, F. Balestra, N. Pierre, Andres Cicuttin, A. Moretti, R.R. Dusaev, F. Nerling, V. Tskhay, M. Chiosso, G. Hamar, Frank Klein, M. Kraemer, J. ter Wolbeek, Jan Tomsa, G. D. Alexeev, I.A. Savin, W. Meyer, A.V. Efremov, I. Orlov, V.D. Samoylenko, D.I. Ryabchikov, M. Slunecka, Yu. Kisselev, F. Gautheron, Miroslav Sulc, Markus Ball, Yu. Ivanshin, R. Salac, I. Gnesi, F. Tosello, K. Kurek, M. Ziembicki, M. Ostrick, O.P. Gavrichtchouk, W.-D. Nowak, Martin Bodlak, L. Sinha, M. Buechele, L. Dhara, T. Matsuda, E.R. Bielert, B. Badelek, N. I. Zhuravlev, Norihiro Doshita, M. Meyer, A.G. Chumakov, E. Burtin, A. Maggiora, E.A. Levchenko, B. Ketzer, N. d'Hose, G.V. Meshcheryakov, A. Austregesilo, J. Barth, V.F. Konstantinov, S. Dalla Torre, G.V. Khaustov, A. Rychter, Yu. V. Mikhailov, S. Wallner, R. Longo, V.N. Kolosov, S. Sirtl, J.F.C.A. Veloso, J. Smolik, A. Vauth, O. Subrt, P. Zavada, S. Ishimoto, H. Fischer, Gerhard K. Mallot, J. Pretz, Alan D. Martin, M.G. Alexeev, S. Uhl, A.G. Olshevsky, R. Heitz, A. Grasso, Maria Liz Crespo, Y. Miyachi, A.A. Lednev, O.M. Kouznetsov, J. Giarra, Michal Dziewiecki, M. Grosse Perdekamp, C. Franco, D. Neyret, W. Augustyniak, S. Ramos, M. Gorzellik, V. Jary, F. Pereira, O.Yu. Denisov, S. Gerassimov, N. Horikawa, A. Sandacz, Andrew Ivanov, Arseniy Rybnikov, S. Sarkar, Z. Kral, F. Kunne, T. Szameitat, K. Juraskova, S. Tessaro, D. Hahne, P. Sznajder, N.S. Rogacheva, D. von Harrach, C. Regali, F. Krinner, Yu.A. Khokhlov, B. Marianski, Bakur Parsamyan, D. Steffen, P. Joerg, S. Levorato, R. Beck, A. Kerbizi, V.E. Burtsev, N. Mitrofanov, A. Thiel, M. Tasevsky, E. Mitrofanov, G. Pesaro, A. Gridin, E. Seder, Celso Augusto Guimarães Santos, J. Lichtenstadt, Valery E. Lyubovitskij, M. Finger, R. Birsa, Andrea Ferrero, S. Dasgupta, A. Antoshkin, K. Kondo, Kamil Augsten, Y. Bedfer, C. Chatterjee, V. Anosov, J.H. Koivuniemi, M. Pešková, Jen-Chieh Peng, S.S. Dasgupta, A. Kveton, G. Nukazuka, A. Magnon, I. Konorov, Laura Silva, Yakov Petrovich Kulinich, E. M. Kabuss, Takahiro Iwata, B.M. Veit, K. Bicker, Johannes Bernhard, Ch. Dreisbach, A. Guskov, Andrea Bressan, M. Wilfert, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, COMPASS, Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badelek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, R., Bodlak, M., Bordalo, P., Bradamante, F., Bressan, A., Buchele, M., Burtin, E., Burtsev, V. E., Chang, W. -C., Chatterjee, C., Chiosso, M., Choi, I., Chumakov, A. G., Chung, S. -U., Cicuttin, A., Crespo, M. L., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Y., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, C., Dunnweber, W., Dusaev, R. R., Dziewiecki, M., Efremov, A., Eversheim, P. D., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Hahne, D., Hamar, G., von Harrach, D., Heitz, R., Herrmann, F., Horikawa, N., D'Hose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y., Iwata, T., Jary, V., Joosten, R., Jorg, P., Juraskova, K., Kabuss, E., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Y. A., Kisselev, Y., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Kramer, M., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Kuznetsov, I. I., Kveton, A., Lednev, A. A., Levchenko, E. A., Levillain, M., Levorato, S., Lian, Y. -S., Lichtenstadt, J., Longo, R., Lyubovitskij, V. E., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Mamon, S. A., Marianski, B., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Y. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Nagaytsev, A., Nerling, F., Neyret, D., Novy, J., Nowak, W. -D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. -C., Pereira, F., Pesek, M., Peskova, M., Peshekhonov, D. V., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Rogacheva, N. S., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmieden, H., Schonning, K., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Tasevsky, M., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Tskhay, V., Uhl, S., Vasilishin, B. I., Vauth, A., Veit, B. M., Veloso, J., Vidon, A., Virius, M., Wallner, S., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., and Ziembicki, M.
Subjects: Photon, generalized parton distribution, muon: polarization, Proton, Generalized Parton Distribution, Parton, measured [cross section], Proton size, nucl-ex, momentum transfer dependence, 01 natural sciences, COMPASS, Subatomär fysik, p: size, Subatomic Physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, Monte Carlo, Quantum chromodynamics, Physics, Range (particle radiation), photon: production, Generalized Parton Distributions, Deep inelastic scattering, Deeply virtual Compton scattering, Exclusive reactions, Exclusive reaction, lcsh:QC1-999, transverse, beam [muon], slope, size: (transverse), Particle Physics - Experiment, Quark, Nuclear and High Energy Physics, exclusive reaction, slope: (calculated), liquid: target [hydrogen], photon: mediation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, hydrogen: liquid: target, 0103 physical sciences, ddc:530, Nuclear Physics - Experiment, 010306 general physics, beam: polarization, hep-ex, 010308 nuclear & particles physics, muon: beam, 160 GeV/c, +muon+p+photon%22">muon p --> muon p photon, size [p], Compton scattering, cross section: measured, CERN SPS, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, lcsh:Physics, experimental results
Abstract: Physics letters / B B793, 188-194 (2019). doi:10.1016/j.physletb.2019.04.038, Published by North-Holland Publ., Amsterdam
Published: 2019

16. The spin structure functiong1pof the proton and a test of the Bjorken sum rule

Author: N.S. Rossiyskaya, F. Giordano, F. Haas, A. Grasso, V. Anosov, A.G. Olshevsky, F. Tessarotto, Laura Silva, C. Riedl, S. Ramos, Fabrice Gautheron, Q. Curiel, D. Neyret, L. Capozza, K. Kondo, A. Srnka, P. Sznajder, R. Jahn, A. Lehmann, J. Pretz, V. Andrieux, K. Bicker, P.D. Eversheim, J. Lichtenstadt, Adam Szabelski, K. Klimaszewski, M. Büchele, Andres Cicuttin, H. Suzuki, I. Orlov, C.D.R. Azevedo, V.D. Samoylenko, G. Reicherz, S. Dalla Torre, O.Yu. Denisov, K. Zaremba, F. Kunne, J.H. Koivuniemi, W.-D. Nowak, P. Kremser, V.A. Polyakov, D.I. Ryabchikov, G. Sbrizzai, M. Levillain, E. M. Kabuß, A. Nagaytsev, Yu. Kisselev, V. Frolov, E. Burtin, A. Amoroso, V.F. Konstantinov, Takahiro Iwata, F. Balestra, M. Ostrick, Soumen Paul, R. Beck, S. Ishimoto, M. Stolarski, Jen-Chieh Peng, H. Fischer, E. Rocco, E.R. Bielert, R. Joosten, C. Adolph, R. Akhunzyanov, G. Baum, I.A. Savin, Andrea Ferrero, Miroslav Sulc, Bakur Parsamyan, F. Hinterberger, V. Tskhay, G. D. Alexeev, E. Fuchey, R.P. Kurjata, I. J. Choi, A.B. Ivanov, M. Boer, S. Dasgupta, A. Austregesilo, A.V. Efremov, O.P. Gavrichtchouk, F. Krinner, Martin Bodlak, M. Finger, L. Sinha, Aram Kotzinian, S. G. Gerassimov, T. Matsuda, Johannes Bernhard, Jan Matousek, A. Guskov, A. Zink, Frank Klein, Andrea Bressan, Alexandr Selyunin, R. Windmolders, M. Chiosso, A. Magnon, R. Birsa, M. Gorzellik, Yu. Ivanshin, M. Krämer, W. Meyer, Maria Liz Crespo, V.I. Nikolaenko, M.G. Alexeev, S. Uhl, S. Sarkar, G.V. Meshcheryakov, Michal Dziewiecki, K. Kurek, V. Jary, M. Ziembicki, Yu. V. Mikhailov, S. Sirtl, B. Grube, W. Eyrich, Nour Makke, F. H. Heinsius, W. C. Chang, Y. Bedfer, S.-U. Chung, D. von Harrach, S. V. Donskov, M. Pešek, A.S. Nunes, C.-Yu. Hsieh, François Herrmann, G.V. Khaustov, D. Panzieri, Janusz Marzec, I. Konorov, M. Quaresma, T. Grussenmeyer, D.V. Peshekhonov, M. Slunecka, T. Szameitat, Federica Sozzi, S. Schopferer, I. Gnesi, J. ter Wolbeek, Z.V. Kroumchtein, N. du Fresne von Hohenesche, F. Thibaud, J. Barth, Gerhard K. Mallot, T. Weisrock, N. Horikawa, F. Tosello, S. Tessaro, D. Hahne, P. Schiavon, Yu.A. Khokhlov, H. Matsuda, M. Wilfert, C. Quintans, O. Kouznetsov, Franco Bradamante, J.F.C.A. Veloso, V. Duic, Alan D. Martin, S.S. Dasgupta, M. V. Zavertyaev, H. Schmieden, R. Hashimoto, J.M. Friedrich, N. Kuchinski, J. Bisplinghoff, S. Huber, C. Marchand, E. Zemlyanichkina, C. Regali, A. Rychter, R. Longo, V.N. Kolosov, K. Schönning, K. Königsmann, S. Platchkov, F. Nerling, J. Novy, C. Franco, A. Maggiora, Celso Augusto Guimarães Santos, S. Grabmüller, K. Schmidt, Norihiro Doshita, N. d'Hose, J. Pochodzalla, P. Bordalo, T. Nagel, L. Dhara, C. Braun, Y. Miyachi, A.A. Lednev, T. Michigami, B. Badelek, A. Sandacz, B. Ketzer, S. Takekawa, F. Pereira, M. Virius, P. Jörg, O.Yu. Shevchenko, S. Levorato, M. Grosse-Perdekamp, and Naomi C R Makins
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Muon, Proton, 010308 nuclear & particles physics, Deep inelastic scattering, 01 natural sciences, Helicity, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Sum rule in quantum mechanics, 010306 general physics, Nucleon, Spin-½
Abstract: New results for the double spin asymmetry A(1)(p) and the proton longitudinal spin structure function g(1)(p) are presented. They were obtained by the COMPASS Collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH3 target. The data were collected in 2011 and complement those recorded in 2007 at 160 GeV, in particular at lower values of x. They improve the statistical precision of g(1)(p)(x) by about a factor of two in the region x less than or similar to 0.02. A next-to-leading order QCD fit to the g(1) world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, Delta Sigma, ranging from 0.26 to 0.36, and to a re-evaluation of the first moment of g(1)(p). The uncertainty of Delta Sigma is mostly due to the large uncertainty in the present determinations of the gluon helicity distribution. A new evaluation of the Bjorken sum rule based on the COMPASS results for the non-singlet structure function g(1)(NS) (x, Q(2)) yields as ratio of the axial and vector coupling constants vertical bar gA/gV vertical bar = 1.22 +/- 0.05 (stat.) +/- 0.10 (syst.), which validates the sum rule to an accuracy of about 9%.
Published: 2016

17. Transverse Extension of Partons in the Proton probed by Deeply Virtual Compton Scattering

Author: R. Akhunzyanov, M. G. Alexeev, G. D. Alexeev, A. Amoroso, V. Andrieux, N. V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C. D. R. Azevedo, B. Badelek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E. R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Buechele, E. Burtin, V. E. Burtsev, W. -C. Chang, C. Chatterjee, M. Chiosso, I. Choi, A. G. Chumakov, S. -U. Chung, A. Cicuttin, M. L. Crespo, S. Dalla Torre, S. S. Dasgupta, S. Dasgupta, O. Yu. Denisov, L. Dhara, S. V. Donskov, N. Doshita, Ch. Dreisbach, W. Duennweber, R. R. Dusaev, M. Dziewiecki, A. Efremov, P. D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J. M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O. P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C. -Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Joerg, K. Juraskova, E. Kabuss, A. Kerbizi, B. Ketzer, G. V. Khaustov, Yu. A. Khokhlov, Yu. Kisselev, F. Klein, J. H. Koivuniemi, V. N. Kolosov, K. Kondo, I. Konorov, V. F. Konstantinov, A. M. Kotzinian, O. M. Kouznetsov, Z. Kral, M. Kraemer, F. Krinner, Z. V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R. P. Kurjata, I. I. Kuznetsov, A. Kveton, A. A. Lednev, E. A. Levchenko, M. Levillain, S. Levorato, Y. -S. Lian, J. Lichtenstadt, R. Longo, V. E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G. K. Mallot, S. A. Mamon, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. V. Meshcheryakov, M. Meyer, W. Meyer, Yu. V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, F. Nerling, D. Neyret, J. Novy, W. -D. Nowak, G. Nukazuka, A. S. Nunes, A. G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J. -C. Peng, F. Pereira, G. Pesaro, M. Pesek, M. Peskova, D. V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V. A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N. S. Rogacheva, D. I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V. D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I. A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, H. Schmieden, K. Schoennig, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, M. Tasevsky, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B. I. Vasilishin, A. Vauth, B. M. Veit, J. Veloso, A. Vidon, M. Virius, S. Wallner, M. Wilfert, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, COMPASS, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: slope: (calculated), photon: production, muon: polarization, beam: polarization, 160 GeV/c, +muon+p+photon%22">muon p --> muon p photon, photon: mediation, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], CERN SPS, cross section: measured, momentum transfer dependence, COMPASS, High Energy Physics - Experiment, hydrogen: liquid: target, High Energy Physics - Experiment (hep-ex), deeply virtual Compton scattering, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), size: (transverse), Nuclear Experiment, Monte Carlo
Abstract: We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160 GeV/$c$ polarized $\mu^+$ and $\mu^-$ beams of the CERN SPS impinging on a liquid hydrogen target. We determine the dependence of the average of the measured $\mu^+$ and $\mu^-$ cross sections for deeply virtual Compton scattering on the squared four-momentum transfer $t$ from the initial to the final final proton. The slope $B$ of the $t$-dependence is fitted with a single exponential function, which yields $B=(4.3 \ \pm \ 0.6_{\text{stat}}\_{- \ 0.3}^{+ \ 0.1}\big\rvert_{\text{sys}}) (\text{GeV}/c)^{-2}$. This result can be converted into an average transverse extension of partons in the proton, $\sqrt{\langle r_{\perp}^2 \rangle} = (0.58 \ \pm \ 0.04_{\text{stat}}\_{- \ 0.02}^{+ \ 0.01}\big\rvert_{\text{sys}})\text{fm}$. For this measurement, the average virtuality of the photon mediating the interaction is $\langle Q^2 \rangle = 1.8\,(\text{GeV/}c)^2$ and the average value of the Bjorken variable is $\langle x_{\text{Bj}} \rangle = 0.056$., Comment: 13 pages, 5 figures
Published: 2018
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18. Search for exclusive photoproduction ofZc±(3900) at COMPASS

Author: F. Sozzi, T. Weisrock, S. Gerassimov, V.D. Samoylenko, E. Zemlyanichkina, Yu.A. Khokhlov, S. Tessaro, R. Windmolders, K. Kondo, P. Jasinski, J. ter Wolbeek, O.P. Gavrichtchouk, L. Sinha, S.S. Dasgupta, R. Sulej, M. Wilfert, Alan D. Martin, A. Maggiora, L. Silva, T. Matsuda, A. Zink, Adam Szabelski, Andres Cicuttin, A. Srnka, R. Joosten, H. Wollny, M. V. Zavertyaev, D.V. Peshekhonov, I. Orlov, N. Doshita, F. Kunne, W. Dünnweber, R. Geyer, M. Chiosso, M. Dziewiecki, D. Hahne, G. Sbrizzai, Takahiro Iwata, I. Konorov, K. Schmidt, V.F. Konstantinov, N. Horikawa, A. Filin, Yu.V. Mikhailov, R. Beck, S. Sosio, P. Sznajder, M. Slunecka, M.G. Alexeev, S. Dalla Torre, C. Braun, P. Jörg, A. Efremov, M. Virius, F. Herrmann, F. Balestra, G. Reicherz, J. Bisplinghoff, J. Pochodzalla, A. Sandacz, C. Quintans, M. Büchele, H. Fischer, A. Rychter, A. Lehmann, Günter Baum, O.Yu. Shevchenko, R. Panknin, Christian Schill, S. Takekawa, J.H. Koivuniemi, K. Königsmann, A. Grasso, I. Gnesi, S. Uhl, E.R. Bielert, A. Nagaytsev, S.-U. Chung, K. Klimaszewski, W.-D. Nowak, Franco Bradamante, M. Ostrick, Bakur Parsamyan, J. Marzec, Johannes Bernhard, F.H. Heinsius, W. Eyrich, A.G. Olshevsky, Andrea Bressan, S. Neubert, R.P. Kurjata, M. Stolarski, Yu. Kisselev, K. Zaremba, F. Nerling, F. Hinterberger, P. Schiavon, L. Steiger, Lei Wang, S. Ramos, A.B. Ivanov, S. Grabmüller, H. Suzuki, T. Schlüter, R. Jahn, A. Ferrero, E. Burtin, V. Duic, Q. Curiel, A. Guskov, I. Uman, J. Pretz, L. Capozza, J. Bieling, E. M. Kabuß, Z.V. Kroumchtein, C. Regali, M. Schott, Ch. Höppner, P. Bordalo, Y. Bedfer, S. Huber, A. Amoroso, Y. Miyachi, A.A. Lednev, F. Gautheron, M. Gorzellik, K. Kurek, S. Platchkov, H. Matsuda, M. Quaresma, A.M. Kotzinian, V. Anosov, N. du Fresne von Hohenesche, I.A. Savin, T. Michigami, G.K. Mallot, V.I. Nikolaenko, Yu. Ivanshin, A. Austregesilo, M. A. Faessler, M. Boer, E. Rocco, C. Franco, D. von Harrach, T. Nagel, S. Schopferer, B. Badełek, S. Goertz, J. Novy, M. Ziembicki, F. Haas, W. Meyer, Maria Liz Crespo, B. Gobbo, S. Paul, C. Adolph, V.A. Polyakov, A. Berlin, C. Elia, G.V. Khaustov, N. Kuchinski, J.M. Friedrich, V. Jary, O.M. Kouznetsov, P.D. Eversheim, N. Makke, A. Magnon, M. Sulc, K. Schönning, V.N. Kolosov, S. Sarkar, N. d'Hose, M. Finger, A.S. Nunes, D. Panzieri, T. Grussenmeyer, S. Ishimoto, R. Birsa, J. Lichtenstadt, T. Szameitat, G.D. Alexeev, D. Neyret, J. Matousek, M. Krämer, B. Grube, J. Barth, H. Schmieden, K. Bicker, R. Hashimoto, D.I. Ryabchikov, F. Tessarotto, M. Levillain, V. Frolov, O.Yu. Denisov, S. Levorato, V. Andrieux, F. Klein, G.V. Meshcheryakov, N.S. Rossiyskaya, S. Sirtl, S.V. Donskov, B. Ketzer, C. Marchand, R. Akhunzyanov, M. Bodlak, and F. Thibaud
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Compass, Hadron, Analytical chemistry, Sigma, High Energy Physics::Experiment, Production (computer science), Tetraquark, Zc(3900), Range (computer programming)
Abstract: A search for the exclusive production of the Z(c)(+/-)(3900) hadron by virtual photons has been performed in the channel Z(c)(+/-)(3900). J/Psi pi(+/-). The data cover the range from 7GeV to 19GeV in the centre-of- mass energy of the photon-nucleon system. The full set of the COMPASS data set collected with a muon beam between 2002 and 2011 has been used. An upper limit for the ratio BR(Z(c)(+/-)(3900)-> J/Psi pi(+/-)) x sigma(gamma N) -> Z(c)(+/-)(3900) N/sigma gamma N -> J/Psi N 3.7 x10(-3) has been established at the confidence level of90%. (C) 2015 The Authors. Published by Elsevier B.V.
Published: 2015

19. Quark helicity distributions from longitudinal spin asymmetries in muon–proton and muon–deuteron scattering

Author: M.G. Alekseev, V.Yu. Alexakhin, Yu. Alexandrov, G.D. Alexeev, A. Amoroso, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, Y. Bedfer, J. Bernhard, R. Bertini, M. Bettinelli, R. Birsa, J. Bisplinghoff, P. Bordalo, F. Bradamante, A. Bravar, A. Bressan, G. Brona, E. Burtin, M.P. Bussa, D. Chaberny, M. Chiosso, S.U. Chung, A. Cicuttin, M. Colantoni, M.L. Crespo, S. Dalla Torre, S. Das, S.S. Dasgupta, O.Yu. Denisov, L. Dhara, V. Diaz, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, A. Efremov, A. El Alaoui, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, H. Fischer, C. Franco, J.M. Friedrich, R. Garfagnini, F. Gautheron, O.P. Gavrichtchouk, R. Gazda, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, S. Grabmüller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, F. Haas, D. von Harrach, T. Hasegawa, F.H. Heinsius, F. Herrmann, C. Heß, F. Hinterberger, N. Horikawa, Ch. Höppner, N. d'Hose, C. Ilgner, S. Ishimoto, O. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, P. Jasinski, G. Jegou, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, R. Konopka, I. Konorov, V.F. Konstantinov, A. Korzenev, A.M. Kotzinian, O. Kouznetsov, K. Kowalik, M. Krämer, A. Kral, Z.V. Kroumchtein, R. Kuhn, F. Kunne, K. Kurek, L. Lauser, J.M. Le Goff, A.A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, T. Liska, A. Maggiora, M. Maggiora, A. Magnon, N. Makke, G.K. Mallot, A. Mann, C. Marchand, A. Martin, J. Marzec, F. Massmann, T. Matsuda, W. Meyer, T. Michigami, Yu.V. Mikhailov, M.A. Moinester, A. Mutter, A. Nagaytsev, T. Nagel, J. Nassalski, T. Negrini, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, A.S. Nunes, A.G. Olshevsky, M. Ostrick, A. Padee, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, B. Pawlukiewicz-Kaminska, E. Perevalova, G. Pesaro, D.V. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V.A. Polyakov, G. Pontecorvo, J. Pretz, C. Quintans, J.-F. Rajotte, S. Ramos, V. Rapatsky, G. Reicherz, A. Richter, F. Robinet, E. Rocco, E. Rondio, D.I. Ryabchikov, V.D. Samoylenko, A. Sandacz, H. Santos, M.G. Sapozhnikov, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, L. Schmitt, S. Schopferer, W. Schröder, O.Yu. Shevchenko, H.-W. Siebert, L. Silva, L. Sinha, A.N. Sissakian, M. Slunecka, G.I. Smirnov, S. Sosio, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, R. Sulej, S. Takekawa, S. Tessaro, F. Tessarotto, A. Teufel, L.G. Tkatchev, S. Uhl, I. Uman, M. Virius, N.V. Vlassov, A. Vossen, Q. Weitzel, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, J. Zhao, N. Zhuravlev, A. Zvyagin, M. G., Alekseev, Alexakhin, V. Y. u., Alexandrovo, Y. u., G. D., Alexeev, A., Amoroso, A., Austregesilo, B., Badełek, F., Balestra, J., Barth, G., Baum, Y., Bedfer, J., Bernhard, R., Bertini, M., Bettinelli, R., Birsa, J., Bisplinghoff, P., Bordalo, Bradamante, Franco, A., Bravar, Bressan, Andrea, G., Brona, E., Burtin, M. P., Bussa, D., Chaberny, M., Chiosso, S. U., Chung, A., Cicuttin, M., Colantoni, M. L., Crespo, S., Dalla Torre, S., Da, S. S., Dasgupta, Denisov, O. Y. u., L., Dhara, V., Diaz, S. V., Donskov, N., Doshita, Duic, Venicio, W., Dunnweber, A., Efremov, A., El Alaoui, P. D., Eversheim, W., Eyrich, M., Faessler, A., Ferrero, A., Filin, M., Finger, M. Finger J., R., H., Fischeri, C., Franco, J. M., Friedrich, R., Garfagnini, F., Gautheron, O. P., Gavrichtchouk, R., Gazda, S., Gerassimov, R., Geyer, Giorgi, Marcello, I., Gnesi, B., Gobbo, S., Goertz, S., Grabmuller, A., Grasso, B., Grube, R., Gushterski, A., Guskov, F., Haa, D., von Harrach, T., Hasegawa, F. H., Heinsiu, F., Herrmann, C., He, F., Hinterberger, N., Horikawa, Hoppner, C. h., N., D’Hose, C., Ilgnerj, S., Ishimoto, O., Ivanov, Ivanshin, Y. u., T., Iwata, R., Jahn, P., Jasinski, G., Jegou, R., Joosten, E., Kabu, D., Kang, B., Ketzer, G. V., Khaustov, Khokhlov, Y. u. A., Kisselev, Y. u., F., Klein, K., Klimaszewski, S., Koblitz, J. H., Koivuniemi, V. N., Kolosov, K., Kondo, K., Konigsmann, R., Konopka, I., Konorov, V. F., Konstantinov, A., Korzenev, A. M., Kotzinian, O., Kouznetsov, K., Kowalik, M., Kramer, A., Kral, Z. V., Kroumchtein, R., Kuhn, F., Kunne, K., Kurek, L., Lauseri, J. M., Le Goff, A. A., Lednev, A., Lehmann, Levorato, Stefano, J., Lichtenstadt, T., Liska, A., Maggiora, M., Maggiora, A., Magnon, N., Makke, G. K., Mallot, A., Mann, C., Marchand, Martin, Anna, J., Marzec, F., Massmann, T., Matsuda, W., Meyer, T., Michigami, Mikhailov, Y. u. V., M. A., Moinester, A., Mutteri, A., Nagaytsev, T., Nagel, J., Nassalski, T., Negrini, F., Nerling, S., Neubert, D., Neyret, V. I., Nikolaenko, A. S., Nune, A. G., Olshevsky, M., Ostrick, A., Padee, R., Panknin, D., Panzieri, B., Parsamyan, S., Paul, B., Pawlukiewicz Kaminska, E., Perevalova, Pesaro, Giulia, D. V., Peshekhonov, G., Piragino, S., Platchkov, J., Pochodzalla, J., Polak, V. A., Polyakov, G., Pontecorvo, J., Pretz, C., Quintan, J. F., Rajotte, S., Ramo, V., Rapatsky, G., Reicherz, A., Richter, F., Robinet, E., Rocco, E., Rondio, D. I., Ryabchikov, V. D., Samoylenko, A., Sandacz, H., Santo, M. G., Sapozhnikov, S., Sarkar, I. A., Savin, Sbrizzai, Giulio, Schiavon, Paolo, C., Schill, T., Schluter, L., Schmitt, S., Schopfereri, W., Schroder, Shevchenko, O. Y. u., H. W., Siebert, L., Silva, L., Sinha, A. N., Sissakian, M., Slunecka, G. I., Smirnov, S., Sosio, Sozzi, Federica, A., Srnka, M., Stolarskij, M., Sulc, R., Sulej, Takekawa, Stefano, S., Tessaro, F., Tessarotto, A., Teufel, L. G., Tkatchev, S., Uhl, I., Uman, M., Viriu, N. V., Vlassov, A., Vossen, Q., Weitzel, R., Windmolder, W., Wi´slicki, H., Wollny, K., Zaremba, M., Zavertyaev, E., Zemlyanichkina, M., Ziembicki, J., Zhao, N., Zhuravlev, and A., Zvyagin
Subjects: Quark, Nuclear and High Energy Physics, Proton, High Energy Physics::Lattice, media_common.quotation_subject, Nuclear Theory, FOS: Physical sciences, COMPASS, 01 natural sciences, Asymmetry, Semi-inclusive deep inelastic scattering, Spin, Structure function, Parton distribution functions, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, COMPASS experiment, Nuclear Experiment, 010306 general physics, Spin-½, media_common, Physics, function, Muon, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, Structure, Helicity, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: Double-spin asymmetries for production of charged pions and kaons in semi-inclusive deep-inelastic muon scattering have been measured by the COMPASS experiment at CERN. The data, obtained by scattering a 160 GeV muon beam off a longitudinally polarised NH_3 target, cover a range of the Bjorken variable x between 0.004 and 0.7. A leading order evaluation of the helicity distributions for the three lightest quarks and antiquark flavours derived from these asymmetries and from our previous deuteron data is presented. The resulting values of the sea quark distributions are small and do not show any sizable dependence on x in the range of the measurements. No significant difference is observed between the strange and antistrange helicity distributions, both compatible with zero. The integrated value of the flavour asymmetry of the helicity distribution of the light-quark sea, \Delta u-bar - \Delta d-bar, is found to be slightly positive, about 1.5 standard deviations away from zero., Comment: 13 pages, 5 figures
Published: 2010

20. Resonance production and ππ S -wave in π−+p→π−π−π++precoil at 190 GeV/c

Author: N. Horikawa, Sergey Donskov, R. Jahn, M. Boer, F. Tosello, W-C Chang, S. Platchkov, E. M. Kabuß, S. Tessaro, D. Hahne, E. Fuchey, I.A. Savin, A.A. Lednev, V.D. Samoylenko, W. Augustyniak, S. Ramos, M. Slunečka, F. Krinner, M. Gorzellik, Yu.A. Khokhlov, Jan Matousek, G. Nukazuka, F. Nerling, P. Sznajder, W.-D. Nowak, P.D. Eversheim, Yu.V. Mikhailov, Laura Silva, O.P. Gavrichtchouk, S. Paul, Michael Kramer, H. Suzuki, C.D.R. Azevedo, M. Wilfert, Martin Bodlak, L. Sinha, J. Nový, T. Matsuda, A. Zink, K. Kondo, G.V. Khaustov, Yu. Kisselev, A. Lehmann, Duic, M. Levillain, Takahiro Iwata, M. Pešek, Aram Kotzinian, D.I. Ryabchikov, A.S. Nunes, M. Ostrick, D. Panzieri, J.F.C.A. Veloso, Janusz Marzec, Y. Bedfer, K. Klimaszewski, S. Dasgupta, E.R. Bielert, Johannes Bernhard, A. Guskov, T. Grussenmeyer, K. Zaremba, M. Ziembicki, M. Büchele, K. Schmidt, C. Quintans, W. Meyer, Maria Liz Crespo, K. Bicker, François Herrmann, V.A. Polyakov, I. J. Choi, Andres Cicuttin, I. Orlov, F. H. Heinsius, M.G. Alexeev, S. Uhl, J.H. Koivuniemi, G. Reicherz, C. Regali, Norihiro Doshita, J. ter Wolbeek, M. Grosse Perdekamp, S. Dalla Torre, A. Austregesilo, Michal Dziewiecki, N. d'Hose, N.S. Rossiyskaya, Marcin Stolarski, P. Kremser, T. Szameitat, S. Takekawa, F. Thibaud, J. Barth, Andrew Ivanov, G.V. Meshcheryakov, Adam Szabelski, J. Pretz, S. Sirtl, S. Sarkar, Ferdinando Giordano, A. Grasso, Gerhard K. Mallot, O.Yu. Denisov, D. von Harrach, G. Sbrizzai, O. Kouznetsov, F. Kunne, T. Weisrock, S. U. Chung, I. Konorov, Franco Bradamante, Miroslav Sulc, Federica Sozzi, S. Schopferer, Y. Miyachi, A. Nagaytsev, F. Balestra, F. Hinterberger, R. Joosten, P. Montuenga, A. Magnon, P. Schiavon, P. Jörg, A. Bressan, Andrea Ferrero, T. Michigami, A. Amoroso, V.N. Kolosov, Tskhay, A. Sandacz, O.Yu. Shevchenko, S. Levorato, F. Haas, S.S. Dasgupta, R. Beck, H. Matsuda, Naomi C R Makins, N. du Fresne von Hohenesche, Celso Augusto Guimarães Santos, T. Schlüter, R. Birsa, C. Riedl, M. Finger, R. Akhunzyanov, M. Virius, Anosov, C. Adolph, J. C. Peng, G. D. Alexeev, W. Dünnweber, S. G. Gerassimov, A.V. Efremov, Fabrice Gautheron, M. A. Faessler, H. Schmieden, J.M. Friedrich, N. Kuchinski, A. Srnka, J. Bisplinghoff, S. Huber, Vladimir Nikolaenko, E. Zemlyanichkina, A. Rychter, R. Longo, K. Schönning, C-Y Hsieh, S. Grabmüller, Frolov, Frank Klein, J. Pochodzalla, C. Franco, Anne-Laure Martin, F. A. Pereira, K. Königsmann, Yu. Ivanshin, P. Bordalo, E. Burtin, V.F. Konstantinov, A. Maggiora, L. Dhara, C. Braun, R.P. Kurjata, Andrieux, H. Fischer, B. Badelek, R. Hashimoto, Jary, Z.V. Kroumchtein, M. V. Zavertyaev, B. Ketzer, B. Marianski, Bakur Parsamyan, C. Marchand, A.G. Olshevsky, J. Lichtenstadt, Q. Curiel, D. Neyret, B. Grube, D.V. Peshekhonov, S. Ishimoto, M. Chiosso, I. Gnesi, K. Kurek, Alexandr Selyunin, W. Eyrich, Nour Makke, M. Quaresma, and F. Tessarotto
Subjects: Quantum chromodynamics, Physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, 01 natural sciences, Nuclear physics, Amplitude, Recoil, 0103 physical sciences, S-wave, Pi, Isobar, 010306 general physics
Abstract: The COMPASS collaboration has collected the currently largest data set on diffractively produced pi(-) pi(-) pi(+) final states using a negative pion beam of 190 GeV/c momentum impinging on a stationary proton target. This data set allows for a systematic partial-wave analysis in 100 bins of three-pion mass, 0.5 < m(3 pi) < 2.5 GeV/c(2), and in 11 bins of the reduced four-momentum transfer squared, 0.1 < t' < 1.0 (GeV/c)(2). This two-dimensional analysis offers sensitivity to genuine one-step resonance production, i.e. the production of a state followed by its decay, as well as to more complex dynamical effects in nonresonant 3 pi production. In this paper, we present detailed studies on selected 3p partial waves with J(PC) = 0(-+) ,1(++) ,2(-+) ,2(++) ,and 4(++). In these waves, we observe the well-known groundstate mesons as well as a new narrow axial-vector meson a(1)(1420) decaying into f(0) (980)pi. In addition, we present the results of a novel method to extract the amplitude of the pi(-)pi(+) subsystem with I(G)J(PC) = 0(+)0(++) in various partial waves from the pi(-)pi(-)pi(+) data. Evidence is found for correlation of the f (0)(980) and f(0)(1500) appearing as intermediate pi(-)pi(+) isobars in the decay of the known pi(1800) and pi(2)(1880).
Published: 2017

21. Transverse target spin asymmetries in exclusive ρ0 muoproduction

Author: C. Adolph, R. Akhunzyanov, M.G. Alekseev, V.Yu. Alexakhin, Yu. Alexandrov, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, R. Bertini, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bravar, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, C. Heß, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Joerg, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, Z. Kral, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, I. Orlov, A.G. Olshevsky, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, M. Pesek, D. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, G. Reicherz, E. Rocco, V. Rodionov, E. Rondio, N.S. Rossiyskaya, D.I. Ryabchikov, V.D. Samoylenko, A. Sandacz, M.G. Sapozhnikov, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, A. Schmidt, K. Schmidt, L. Schmitt, H. Schmïden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. Ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, J. Vondra, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, and M. Ziembicki
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, Elementary particle, Parton, 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, media_common, Lepton
Abstract: COMPASS has studied exclusive production of ρ 0 mesons using a 160 GeV/ c muon beam and a transversely polarised NH 3 target. Five single-spin and three double-spin azimuthal aymmetries were measured in dependence on Q 2 , x Bj , or p T 2 . Except the sin ϕ S asymmetry, obtained to be − 0.019 ± 0.008( stat .) ± 0.003( syst .), all others were found to be consistent with zero within experimental uncertainties. Phenomenological GPD-based model calculations agree well with the data and interpret the result as evidence for the existence of chiral-odd, transverse generalised parton distributions.
Published: 2014

22. Odd and even partial waves of f ηπ−ηπ− and η′π−η′π− in π−p→η(′)π−pπ−p→η(′)π−p at 191 GeV/c

Author: Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badełek, B., Balestra, F., Barth, J., Baum, G., Bek, R., Bedfer, Y., Berlin, A., Bernhardm, J., K. Bicker, J, Q, E. R. Bielert, J, J. Bieling, D, R. Birsa, Y, J. Bisplinghoff, C, M. Bodlak, S, M. Boer, V, P. Bordao, L, Bradamante, Franco, Y, C. Braun, H, Bressan, Andrea, M. Büchele, I, E. Burtin, V, L. Capozza, V, M. Chiosso, Aa, Suchung, S. U. Chung q, Acicuttin, A. Cicuttin z, M. L. Crespo, Z, Q. Curiel, V, DALLA TORRE, Silvia, Dasgupta, SHUDDHA SHANKAR, S. Dasgupta, Y, O. Y. u. Denisov, Ac, S. V. Donskov, U, N. Doshita, Ag, Duic, Venicio, W. Dünnweber, P, M. Dziewiecki, Af, Aefremov, A. Efremov g, C. Elia, X, Pdeversheim, P. D. Eversheim c, Weyrich, W. Eyrich h, M. Faessler, P, A. Ferrero, V, M. Finger, S, M. FingerJr, S, H. Fscher, I, C. Franco, L, Dufresnevonhoheneschem, N., J, J. M. Friedrich, Q, V. Frolov, J, F. Gautheron, B, Opgavrichtchouk, O. P. Gavrichtchouk g, S. Gerassimv, O, R. Geyer, P, I. Gnesi, Aa, B. Gobbo, Y, S. Goertz, D, M. Gorzellk, I, S. Grabmüller, Q, A. Grasso, Aa, B. Grube, Q, Tgrussenmeyer, T. Grussenmeyer i, A. Guskov, G, Fhaas, F. Haas q, Vonharrachm, D., D. Hahne, D, R. Hashimoto, Ag, Fhheinsius, F. H. Heinsius i, F. Herrmann, I, Fhinterberger, F. Hinterberger c, Ch Höppner, C. h. Höppner q, N. Hoikawa, R, N. d’Hose, V, S. Huber, Q, S. Ishimoto, Ag, A. Ivanov, G, Yuivanshin, Y. u. Ivanshin g, T. Iwata, Ag, R. Jahn, C, V. Jary, T, Jasinskim, P., P. Jörg, I, R. Joosten, C, Kabußm, E., B. Ketzer, Q, G. V. Khastov, U, Yuakhokhlov, Y. u. A. Khokhlov u, Yukisselev, Y. u. Kisselev g, F. Klein, D, K. Klimaszewski, Ad, J. H. Koivuniemi, B, V. N. Kolosov, U, K. Kondo, Ag, K. Köngsmann, I, I. Knrv, O, Vfkonstantinov, V. F. Konstantinov u, A. M. Kotzinian, Aa, O. Kouznetsov, G, M. Krämer, Q, Z. V. Kroumchtein, G, N. Kuchinski, G, Fkunne, F. Kunne v, K. Kurek, Ad, R. P. Kurjata, Af, Aalednev, A. A. Lednev u, A. Lemann, H, M. Leillain, V, Levorato, Stefano, Lichtenstadtw, J., A. Maggiora, Ac, Magnon, A., Makke, Nour, G. K. Mallot, J, C. Marchand, V, Martin, Anna, J. Marzec, Af, Matousek, Jan, H. Matsuda, Ag, Tmatsuda, T. Matsuda n, G. Meshcheryakov, G, Wmeyer, W. Meyer b, T. Michigami, Ag, Yuvmikhailov, Y. u. V. Mikhailov u, Y. Miyachi, Ag, A. Naaytsev, G, T. Nagel, Q, Fnerlingm, F. Nerlingm, S. Neubert, Q, D. Neyret, V, J. Novy, T, W. DNowak, W. D. Nowak i, Asnunes, A. S. Nunes l, Agolshevsky, A. G. Olshevsky g, I. Orlov, G, Ostrickm, M., R. Panknin, D, D. Panzieri, Ab, B. Parsamyan, Aa, Spaul, S. Paul q, D. V. Peshekhonov, G, S. Platchko, V, Pochodzallam, J., Vapolyakov, V. A. Polyakov u, J. Pretz, D, M. Quaresma, L, C. Quintans, L, S. Ramos, L, C. Regal, I, G. Reicherz, B, E. Rocco, J, N. S. Rossiyskaya, G, D. I. Ryabchikov, U, A. Rychter, Af, V. D. Samoylenko, U, A. Sandacz, Ad, S. Sarkar, F, Iasavin, I. A. Savin g, G. Sbrizzai, X, Schiavon, Paolo, C. Schll, I, Tschlüter, T. Schlüter p, K. Schmdt, I, H. Schmieen, D, K. Schönning, J, S. Schopferer, I, M. Schott, J, Oyushevchenko, O. Y. u. Shevchenko g, L. Siva, L, L. Sinha, F, S. Srtl, I, M. Slunecka, G, S. Sosio, Aa, Sozzi, Federica, Asrnka, A. Srnka e, L. Steiger, Y, M. Stoarski, L, M. Sulc, K, R. Sulej, Ad, H. Suzuki, Ag, A. Szabelski, Ad, Tszameitat, T. Szameitat i, P. Sznajder, Ad, Takekawa, Stefano, J. terWolbeek, I, S. Tessaro, Y, Ftessarotto, F. Tessarotto y, Fthibaud, F. Thibaud v, S. Uhl, Q, Umanp, I., M. Virius, T, L. Wang, B, Weisrockm, T., Wilfertm, M., R. Winmolers, D, H. Wollny, V, Zarembaaf, K., M. Zavertyaev, O, E. Zemlyanichkina, G, M. Ziembicki, Af, C., Adolph, R., Akhunzyanov, M. G., Alexeev, G. D., Alexeev, A., Amoroso, V., Andrieux, V., Anosov, A., Austregesilo, B., Badełek, F., Balestra, J., Barth, G., Baum, R., Bek, Y., Bedfer, A., Berlin, Bernhardm, J., J, K. Bicker, Q, J, E. R. Bielert, D, J. Bieling, Y, R. Birsa, C, J. Bisplinghoff, S, M. Bodlak, V, M. Boer, L, P. Bordao, Bradamante, Franco, Y, H, C. Braun, Bressan, Andrea, I, M. Büchele, V, E. Burtin, V, L. Capozza, Aa, M. Chiosso, Ac, Suchung, S. U. Chung q, Acicuttin, A. Cicuttin z, Z, M. L. Crespo, V, Q. Curiel, DALLA TORRE, Silvia, Dasgupta, SHUDDHA SHANKAR, Y, S. Dasgupta, Ac, O. Y. u. Denisov, U, S. V. Donskov, Ag, N. Doshita, Duic, Venicio, P, W. Dünnweber, Af, M. Dziewiecki, Aefremov, A. Efremov g, X, C. Elia, Pdeversheim, P. D. Eversheim c, Weyrich, W. Eyrich h, P, M. Faessler, V, A. Ferrero, S, M. Finger, S, M. FingerJr, I, H. Fscher, L, C. Franco, Dufresnevonhoheneschem, N., J, Q, J. M. Friedrich, J, V. Frolov, B, F. Gautheron, Opgavrichtchouk, O. P. Gavrichtchouk g, O, S. Gerassimv, P, R. Geyer, Aa, I. Gnesi, Y, B. Gobbo, D, S. Goertz, I, M. Gorzellk, Q, S. Grabmüller, Aa, A. Grasso, Q, B. Grube, Tgrussenmeyer, T. Grussenmeyer i, G, A. Guskov, Fhaas, F. Haas q, Vonharrachm, D., D, D. Hahne, Ag, R. Hashimoto, Fhheinsius, F. H. Heinsius i, I, F. Herrmann, Fhinterberger, F. Hinterberger c, Ch Höppner, C. h. Höppner q, R, N. Hoikawa, V, N. d’Hose, Q, S. Huber, Ag, S. Ishimoto, G, A. Ivanov, Yuivanshin, Y. u. Ivanshin g, Ag, T. Iwata, C, R. Jahn, T, V. Jary, Jasinskim, P., I, P. Jörg, C, R. Joosten, Kabußm, E., Q, B. Ketzer, U, G. V. Khastov, Yuakhokhlov, Y. u. A. Khokhlov u, Yukisselev, Y. u. Kisselev g, D, F. Klein, Ad, K. Klimaszewski, B, J. H. Koivuniemi, U, V. N. Kolosov, Ag, K. Kondo, I, K. Köngsmann, O, I. Knrv, Vfkonstantinov, V. F. Konstantinov u, Aa, A. M. Kotzinian, G, O. Kouznetsov, Q, M. Krämer, G, Z. V. Kroumchtein, G, N. Kuchinski, Fkunne, F. Kunne v, Ad, K. Kurek, Af, R. P. Kurjata, Aalednev, A. A. Lednev u, H, A. Lemann, V, M. Leillain, Levorato, Stefano, Lichtenstadtw, J., Ac, A. Maggiora, A., Magnon, Makke, Nour, J, G. K. Mallot, V, C. Marchand, Martin, Anna, Af, J. Marzec, Matousek, Jan, Ag, H. Matsuda, Tmatsuda, T. Matsuda n, G, G. Meshcheryakov, Wmeyer, W. Meyer b, Ag, T. Michigami, Yuvmikhailov, Y. u. V. Mikhailov u, Ag, Y. Miyachi, G, A. Naaytsev, Q, T. Nagel, Fnerlingm, F. Nerlingm, Q, S. Neubert, V, D. Neyret, T, J. Novy, W. DNowak, W. D. Nowak i, Asnunes, A. S. Nunes l, Agolshevsky, A. G. Olshevsky g, G, I. Orlov, Ostrickm, M., D, R. Panknin, Ab, D. Panzieri, Aa, B. Parsamyan, Spaul, S. Paul q, G, D. V. Peshekhonov, V, S. Platchko, Pochodzallam, J., Vapolyakov, V. A. Polyakov u, D, J. Pretz, L, M. Quaresma, L, C. Quintan, L, S. Ramo, I, C. Regal, B, G. Reicherz, J, E. Rocco, G, N. S. Rossiyskaya, U, D. I. Ryabchikov, Af, A. Rychter, U, V. D. Samoylenko, Ad, A. Sandacz, F, S. Sarkar, Iasavin, I. A. Savin g, X, G. Sbrizzai, Schiavon, Paolo, I, C. Schll, Tschlüter, T. Schlüter p, I, K. Schmdt, D, H. Schmieen, J, K. Schönning, I, S. Schopferer, J, M. Schott, Oyushevchenko, O. Y. u. Shevchenko g, L, L. Siva, F, L. Sinha, I, S. Srtl, G, M. Slunecka, Aa, S. Sosio, Sozzi, Federica, Asrnka, A. Srnka e, Y, L. Steiger, L, M. Stoarski, K, M. Sulc, Ad, R. Sulej, Ag, H. Suzuki, Ad, A. Szabelski, Tszameitat, T. Szameitat i, Ad, P. Sznajder, Takekawa, Stefano, I, J. terWolbeek, Y, S. Tessaro, Ftessarotto, F. Tessarotto y, Fthibaud, F. Thibaud v, Q, S. Uhl, Umanp, I., T, M. Viriu, B, L. Wang, Weisrockm, T., Wilfertm, M., D, R. Winmoler, V, H. Wollny, Zarembaaf, K., O, M. Zavertyaev, G, E. Zemlyanichkina, and Af, M. Ziembicki
Subjects: resonance, QCD, non qbarq states
Abstract: Exclusive production of ηπ− and η π− has been studied with a 191 GeV/c π− beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum (L) characteristics in the inspected invariant mass range up to 3 GeV/c2. A striking similarity between the two systems is observed for the L = 2, 4, 6 intensities (scaled by kinematical factors) and the relative phases. The known resonances a2(1320) and a4(2040) are in line with this similarity. In contrast, a strong enhancement of η π− over ηπ− is found for the L = 1, 3, 5 waves, which carry non-q¯q quantum numbers. The L = 1 intensity peaks at 1.7 GeV/c2 in η π− and at 1.4 GeV/c2 in ηπ−, the corresponding phase motions with respect to L =2 are different.
Published: 2015

23. Leading order determination of the gluon polarisation from DIS events with high-pThadron pairs

Author: S. Koblitz, S. Ramos, F. Haas, R. Geyer, R. Panknin, E. Rondio, Fabrice Gautheron, M. A. Faessler, V.Yu. Alexakhin, J. Polak, V.N. Kolosov, Christian Schill, N.S. Rossiyskaya, F. Kunne, R. Jahn, F. Tessarotto, C. Heß, C. Adolph, A. Korzenev, A. Grasso, J. M. Le Goff, D. Chaberny, V. Duic, E. M. Kabuß, O.P. Gavrichtchouk, A.A. Lednev, A. Nagaytsev, F. Balestra, A. Srnka, L. Sinha, T. Matsuda, G. D. Alexeev, F. Nerling, A.V. Efremov, W. Dünnweber, Yu.V. Mikhailov, R. Gushterski, Yu. Alexandrov, Yu. Kisselev, George I. Smirnov, S. Hedicke, Z.V. Kroumchtein, I.A. Savin, S. Grabmüller, I. Konorov, W.-D. Nowak, O.Yu. Denisov, A. Zvyagin, M. Ostrick, Bakur Parsamyan, C. Quintans, K. Zaremba, Alessandro Bressan, D. von Harrach, S. Gerassimov, G. Piragino, T. Guthörl, N. Horikawa, Sergey Donskov, L. Dhara, S. Ishimoto, Frank Klein, C. Braun, V.A. Polyakov, G. Sbrizzai, Ch. Höppner, A. Amoroso, S. Uhl, S.U. Chung, L. Schmitt, Oleg V. Ivanov, Maxence Vandenbroucke, B. Badelek, R. Birsa, Matthias Schott, N. du Fresne von Hohenesche, T. Schlüter, M. Giorgi, Michal Dziewiecki, E. Perevalova, S. Tessaro, E. Rocco, A. Richter, K. Klimaszewski, S. Das, R. Gazda, M. Chiosso, A.G. Olshevsky, Laura Silva, B. Ketzer, I. Uman, A. Morreale, Andres Cicuttin, A. Filin, A. Magnon, G. Reicherz, R. Joosten, V.D. Samoylenko, K. Kurek, A. Padee, L. G. Tkatchev, Yu.A. Khokhlov, D. Neyret, S. Paul, J. Pochodzalla, M. Stolarski, J.M. Friedrich, K. Bicker, R. Bertini, Andrea Ferrero, S. Dalla Torre, J. Bisplinghoff, S. Huber, G.V. Khaustov, S.S. Dasgupta, A. Mutter, Jean-Francois Rajotte, D.I. Ryabchikov, A.S. Nunes, Vladimir Nikolaenko, Miroslav Sulc, Aram Kotzinian, F. Hinterberger, P. Bordalo, D. Kang, R. Windmolders, H. Wollny, D. Panzieri, L. Lauser, O. Kouznetsov, E. Zemlyanichkina, W. Meyer, Maria Liz Crespo, J. Lichtenstadt, J. Marzec, Yu. Ivanshin, M.G. Alekseev, P. Jasinski, Franco Bradamante, M. V. Zavertyaev, Anne-Laure Martin, K. Schönning, Alexey Antonov, A. Bravar, P. Sznajder, J. ter Wolbeek, Johannes Bernhard, J. Nassalski, S. Sosio, S. Takekawa, M. Bettinelli, Michael Kramer, A. Guskov, K. Kondo, J. Barth, Y. Bedfer, E. Burtin, V.F. Konstantinov, A. Lehmann, C. Franco, J.H. Koivuniemi, C. Marchand, Gerhard K. Mallot, S. Goertz, V. Rapatsky, Sarben Sarkar, H. Fischer, P. Schiavon, K. Königsmann, A. Maggiora, B. Grube, N. dʼHose, N.V. Vlassov, Günter Baum, O.Yu. Shevchenko, S. Levorato, R. Garfagnini, M. Finger, Murray Moinester, François Herrmann, S. Platchkov, Lei Wang, M. Slunecka, M. Virius, W. Wiślicki, G.B. Pontecorvo, B. Gobbo, N. I. Zhuravlev, Federica Sozzi, S. Schopferer, T. Nagel, J. Pretz, R. Sulej, S. Procureur, T. Michigami, A. Mann, W. Eyrich, Nour Makke, J. Bieling, A. Sandacz, M. Quaresma, M.G. Sapozhnikov, K. Schmidt, D.V. Peshekhonov, Norihiro Doshita, A. N. Sissakian, G. Pesaro, I. Gnesi, P.D. Eversheim, S. Neubert, T. Iwata, M. Ziembicki, F. H. Heinsius, A. Austregesilo, and C. Elia
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Muon, Proton, 010308 nuclear & particles physics, Hadron, Deep inelastic scattering, 01 natural sciences, Gluon, Nuclear physics, 0103 physical sciences, COMPASS experiment, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: We present a determination of the gluon polarisation Delta g/g in the nucleon, based on the longitudinal double-spin asymmetry of DIS events with Q(2) > 1 (GeV/c)(2) including a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam scattering off a polarised (LiD)-Li-6 target. The gluon polarisation is evaluated by a Neural Network approach for three intervals of the gluon momentum fraction x(g) covering the range 0.04 < x(g) < 0.27. The values obtained at leading order in QCD do not show any significant dependence on x(g). Their average is Delta g/g = 0.125 +/- 0.060 (stat.) +/- 0.063 (syst.) at average x(g) = 0.09 and a scale of mu(2) = 3 (GeV/c)(2).
Published: 2013

24. Exclusive muoproduction on transversely polarised protons and deuterons

Author: O.P. Gavrichtchouk, M. Ziembicki, L. Sinha, S. Sarkar, L. Steiger, A. Padee, T. Matsuda, A. Srnka, S. Dasgupta, A.V. Efremov, G. D. Alexeev, W. Dünnweber, A. Austregesilo, C. Elia, R. Bertini, Andrea Ferrero, G. Piragino, Jean-Francois Rajotte, D.I. Ryabchikov, M. Wilfert, I. Konorov, E. Rondio, K. Zaremba, M. Krämer, S.-U. Chung, Z.V. Kroumchtein, L. Lauser, A.S. Nunes, D. Panzieri, S. Uhl, M. Giorgi, S. Goertz, C. Quintans, F.H. Heinsius, V.A. Polyakov, G. Sbrizzai, A. Zvyagin, T. Liška, Michal Dziewiecki, S. Neubert, Laura Silva, A. Magnon, S. Grabmüller, A. Amoroso, François Herrmann, L. Dhara, C. Braun, B. Grube, B. Badelek, S. Koblitz, N. du Fresne von Hohenesche, T. Schlüter, E. Rocco, V. Duic, M. Chiosso, O. Kouznetsov, Frank Klein, P.D. Eversheim, Aram Kotzinian, R. Windmolders, G.I. Smirnov, B. Ketzer, A. Filin, Anne-Laure Martin, Franco Bradamante, K. Kurek, G.V. Khaustov, Yu. Kisselev, Fabrice Gautheron, H. Suzuki, M. Slunecka, W. Wiślicki, Murray Moinester, L. Schmitt, J. Pochodzalla, M. Büchele, J. Polak, M. A. Faessler, B. Gobbo, K. Schönning, Alexey Antonov, Ch. Höppner, A. Bravar, J. Lichtenstadt, S. Platchkov, S. Sosio, M. Ostrick, E. M. Kabuß, V.Yu. Alexakhin, K. Bicker, W. Eyrich, W. Schröder, Nour Makke, J.H. Koivuniemi, J. Bieling, N. I. Zhuravlev, Yu. Ivanshin, P. Bordalo, R. Sulej, D. Kang, Federica Sozzi, I.A. Savin, E. Perevalova, O.Yu. Denisov, F. Kunne, C. Franco, M. Stolarski, N. dʼHose, A. Morreale, R. Jahn, A. Korzenev, M. Quaresma, S. Schopferer, V. Rapatsky, P. Schiavon, P. Jasinski, E. Burtin, J.M. Friedrich, J. Bisplinghoff, S.S. Dasgupta, T. Negrini, R. Panknin, N.S. Rossiyskaya, T. Nagel, J. Pretz, Vladimir Nikolaenko, W.-D. Nowak, R. Joosten, M.G. Sapozhnikov, M. V. Zavertyaev, V.F. Konstantinov, Miroslav Sulc, F. Hinterberger, M. Virius, J. ter Wolbeek, A.A. Lednev, W. Meyer, Maria Liz Crespo, E. Zemlyanichkina, S. Ishimoto, L. Capozza, D.V. Peshekhonov, K. Kondo, H. Fischer, T. Michigami, A. Grasso, J. Barth, C. Marchand, Y. Bedfer, G. Pesaro, M.G. Alekseev, F. Nerling, G. Jegou, A. Sandacz, R. Gushterski, I. Gnesi, V. Jary, K. Königsmann, T. Guthörl, Yu. Alexandrov, Gerhard K. Mallot, K. Schmidt, Bakur Parsamyan, A. Nagaytsev, F. Balestra, S. Takekawa, Oleg V. Ivanov, Norihiro Doshita, H. Wollny, A. Maggiora, R. Birsa, S. Das, A.G. Olshevsky, A. N. Sissakian, D. Neyret, V.N. Kolosov, A. Mutter, N.V. Vlassov, J. Marzec, Günter Baum, O.Yu. Shevchenko, S. Levorato, R. Garfagnini, M. Finger, S. Gerassimov, N. Horikawa, K. Klimaszewski, V.D. Samoylenko, Sergey Donskov, Andres Cicuttin, G. Reicherz, A. Mann, S. Tessaro, S. Dalla Torre, Achim Richter, F. Haas, R. Geyer, Christian Schill, Yu.A. Khokhlov, S. Ramos, L. Wang, P. Sznajder, D. von Harrach, A. Lehmann, Maxence Vandenbroucke, L. G. Tkatchev, C. Heß, Yu.V. Mikhailov, Takahiro Iwata, I. Uman, Johannes Bernhard, A. Guskov, M. Bettinelli, Andrea Bressan, F. Tessarotto, G.V. Meshcheryakov, V. Frolov, Soumen Paul, Matthias Schott, and C. Adolph
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Angular momentum, Muon, Meson, 010308 nuclear & particles physics, media_common.quotation_subject, Nuclear Theory, Parton, 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, media_common, Spin-½
Abstract: The transverse target spin azimuthal asymmetry A(UT)(sin(phi-phi s)) in hard exclusive production of rho(0) mesons was measured at COMPASS by scattering 160 GeV/c muons off transversely polarised protons and deuterons. The measured asymmetry is sensitive to the nucleon helicity-flip generalised parton distributions E-q, which are related to the orbital angular momentum of quarks in the nucleon. The Q(2), x-B-j and p(T)(2) dependence of A(UT)(sin(phi-phi s)) is presented in a wide kinematic range: 1 (GeV/c)(2) < Q(2) < 10 (GeV/c)(2), 0.003 < xB(j) < 0.3 and 0.05 (GeV/c)(2) < p(T)(2) < 0.5 (GeV/c)(2) for protons or 0.10 (GeV/c)(2) < p(T)(2) < 0.5 (GeV/c)(2) for deuterons. Results for deuterons are obtained for the first time. The measured asymmetry is small in the whole kinematic range for both protons and deuterons, which is consistent with the theoretical interpretation that contributions from GPDs E-u and E-d approximately cancel. (C) 2012 Elsevier B.V. All rights reserved.
Published: 2012

25. Transverse target spin asymmetries in exclusive <math altimg='si1.gif' xmlns='http://www.w3.org/1998/Math/MathML'><msup><mrow><mi>ρ</mi></mrow><mrow><mn>0</mn></mrow></msup></math> muoproduction

Author: Guthoerl, T., Paul, S., T. Nagel, A.M. Kotzinian, S. Gerassimov, Hohenesche, N. du Fresne von, Olshevsky, A.G.(Joint Institute for Nuclear Research, Moscow Region, Dubna, 141980, Russia), Quintans, C., Silva, L., Finger, M, Elia, C., Bedfer, Y., B. Grube, Quaresma, M., Balestra, F., F. Gautheron, Austregesilo, A., Badellek, B., Wang, L., Kabuss, E., Doshita, N., Matsuda, H.(Yamagata University, Yamagata, 992-8510, Japan), Sirtl, S., Kunne, F., Schlueter, T., Koivuniemi, J. H., S. Takekawa, V.A. Polyakov, Ziembicki, M., Berlin, A., Garfagnini, R.(University of Turin, Department of Physics, Turin, 10125, Italy), Huber, S., Nunes, A.S.(LIP, Lisbon, 1000-149, Portugal), Lednev, A. A., Dasgupta, S., Gavrichtchouk, O. P., Levorato, S.(Trieste Section of INFN, Trieste, 34127, Italy), Kurek, K., Ishimoto, S., Chung, S U., Thibaud, F.(CEA IRFU/SPhN Saclay, Gif-sur-Yvette, 91191, France), Mikhailov, Yu.V.(State Research Center of the Russian Federation, Institute for High Energy Physics, Protvino, 142281, Russia), V. Andrieux, M. Faessler, Crespo, M.L.(Abdus Salam ICTP, Trieste, 34151, Italy), Capozza, L., Guskov, A., Kouznetsov, O., Ramos, S., Platchkov, S.(CEA IRFU/SPhN Saclay, Gif-sur-Yvette, 91191, France), Shevchenko, O. Yu., Dziewiecki, M., Matsuda, T, V.N. Kolosov, K. Klimaszewski, Eyrich, W., Rodionov, V., E. Zemlyanichkina, Ostrick, M., Khokhlov, Yu. A., N.S. Rossiyskaya, Haas, F., Cicuttin, A., P. Jasinski, Efremov, A.(Joint Institute for Nuclear Research, 141980, Moscow region, Dubna, Russia), Ketzer, B., Sozzi, F., Friedrich, J.M., Schmidt, K, J. Bieling, Meyer, W, Filin, A., Kroumchtein, Z. V., Martin, A., Lichtenstadt, J., Ferrero, A., Khaustov, G. V., Fischer, H., Buechele, M., I.A. Savin, Grasso, A., Bressan, A., Slunecka, M., Srnka, A., J. Matousek, Rocco, E., S. Neubert, Sarkar, S., Konstantinov, V. F., Bertini, R., Makke, N., E. Burtin, Schmieden, H., Sandacz, A., Adolph, C., Hinterberger, F., Goertz, S., Vondra, J., Franco, C, A. Amoroso, Alexakhin, V. Yu., F. Nerling, Kisselev, Yu.(Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980, Russia), T. Iwata, Sapozhnikov, M. G., Gnesi, I., Miyachi, Y., Alexandrov, Yu., Duennweber, W., Rondio, E., Kondo, K., Nowak, W.-D., Lehmann, A.(Universität Erlangen–Nürnberg, Physikalisches Institut, Erlangen, 91054, Germany), Kang, D., Frolov, V., Schiavon, P., M. Giorgi, Baum, Günter, Kurjata, R. P., Meshcheryakov, G., Donskov, S. V., Reicherz, G., Joosten, R., Parsamyan, B., Wilfert, M., Neyret, D., M. Vandenbroucke, Boer, M., V.I. Nikolaenko, Marchand, C., Dasgupta, S.S.(Matrivani Institute of Experimental Research & Education, Calcutta-700 030, India 12 12 Supported by SAIL (CSR), Govt. of India.), Michigami, T., Ryabchikov, D.I., Pretz, J., S. Sosio, Suzuki, H, Kraemer, M., M.G. Alekseev, Eversheim, P. D., jr, M. Finger, Hoeppner, Ch., Schott, M, Gushterski, R., Hess, C, Zhuravlev, N., Maggiora, A., Panknin, R., Zaremba, K., Heinsius, F. H., S. Schopferer, Tessaro, S., Wollny, H., K. Schoenning(Uppsala University), Bisplinghoff, J., Sznajder, P., Steiger, L.(Trieste Section of INFN, 34127, Trieste, Italy), A. Morreale, Schmidt, A., Barth, J., Samoylenko, V. D., Konorov, I., Mallot, G. K., Marzec, J., Pesek, M.(Charles University in Prague, Faculty of Mathematics and Physics, Prague, 18000, Czech Republic), Torre, S. Dalla, Virius, M.(Czech Technical University in Prague, Prague, 16636, Czech Republic), P. Bordalo, Bradamante, F., Stolarski, M., Harrach, D. von, M. Sulc, Gobbo, B., Jary, V., Koenigsmann, K., Zavertyaev, M., W. Wislicki, Sinha, L., C. Schill, Panzieri, D.(University of Eastern Piedmont, Alessandria, 15100, Italy), Sulej, R., Grabmueller, S., Jahn, R.(Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, 53115, Germany), Polak, J, Pochodzalla, J., Windmolders, R., Ivanshin, Yu., Birsa, R., Bicker, K., Magnon, A.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Tessarotto, F., M. Chiosso, R. Geyer, Alexeev, G.D., Horikawa, N., d'Hose, N., Denisov, O.Yu., Klein, F.(Physikalisches Institut, Universität Bonn, Bonn, 53115, Germany), Braun, C., Piragino, G., Kuchinski, N., S. Uhl, G. Sbrizzai, Schmitt, L, Weisrock, T., F. Herrmann, Wolbeek, J. Ter, Novy, J, Bravar, A.(University of Geneva, Section de Physique, DPNC, Geneva, Switzerland), Nagaytsev, A., Uman, I.(Dogus University, Istanbul, 34722, Turkey), Duic, V., Hahne, D., and J. Bernhard
Subjects: Physik, Nuclear and High Energy Physics, ddc:530, Nuclear Experiment, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract: Exclusive production of ρ0 mesons was studied at the COMPASS experiment by scattering 160 GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured as a function of Q2 , xBj , or pT2 . The sinϕS asymmetry is found to be −0.019±0.008(stat.)±0.003(syst.) . All other asymmetries are also found to be of small magnitude and consistent with zero within experimental uncertainties. Very recent calculations using a GPD-based model agree well with the present results. The data is interpreted as evidence for the existence of chiral-odd, transverse generalized parton distributions.
Published: 2016

26. Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high $p_T$

Author: M. Grosse Perdekamp, N.S. Rossiyskaya, I.A. Savin, Jen-Chieh Peng, A. Grasso, M. Wilfert, C. Quintans, S. Grabmüller, R. Kuhn, K. Klimaszewski, O.Yu. Denisov, F. Kunne, P.D. Eversheim, S. Takekawa, R. Beck, R. Akhunzyanov, G. D. Alexeev, M. Chiosso, R. Hashimoto, R.P. Kurjata, J. Pochodzalla, P. Bordalo, H. Suzuki, C.D.R. Azevedo, F. Pereira, K. Kondo, R. Jahn, K. Kurek, O. Kouznetsov, Franco Bradamante, V. Anosov, C. Regali, Andres Cicuttin, Fabrice Gautheron, P. Schiavon, G.V. Meshcheryakov, P. Montuenga, S. Gerassimov, N. Horikawa, F. Tosello, B. Marianski, O.P. Gavrichtchouk, Martin Bodlak, L. Sinha, T. Matsuda, A. Zink, I. Orlov, V.D. Samoylenko, G. Reicherz, Yu. V. Mikhailov, S. Sirtl, Celso Augusto Guimarães Santos, J. Pretz, Bakur Parsamyan, I. Konorov, S.S. Dasgupta, S. Dalla Torre, H. Matsuda, M. Boer, L. Dhara, C. Braun, S. Tessaro, D. Hahne, M.G. Alexeev, M. V. Zavertyaev, S. Platchkov, Z.V. Kroumchtein, N. du Fresne von Hohenesche, M. Levillain, C.-Y. Hsieh, V. Frolov, Soumen Paul, T. Szameitat, B. Badelek, S. Uhl, Michal Dziewiecki, A. Magnon, C. Marchand, C. Adolph, P. Kremser, D.I. Ryabchikov, B. Ketzer, Yu.A. Khokhlov, A. Srnka, F. Nerling, R. Joosten, S. Sarkar, G. Nukazuka, Andrea Ferrero, M. Faessler, M. Stolarski, M. Gorzellik, S. V. Donskov, M. Pešek, I. J. Choi, V.I. Nikolaenko, Yu. Kisselev, A.S. Nunes, Johannes Bernhard, A. Guskov, D. Panzieri, Janusz Marzec, A.G. Olshevsky, M. Ostrick, T. Grussenmeyer, S. Dasgupta, A. Austregesilo, B. Grube, E.R. Bielert, F. Krinner, Laura Silva, A.V. Efremov, K. Zaremba, V.A. Polyakov, Andrea Bressan, Miroslav Sulc, F. Hinterberger, W. Augustyniak, S. Ramos, J.F.C.A. Veloso, Y. Miyachi, A.A. Lednev, G. Sbrizzai, Frank Klein, M. Virius, Q. Curiel, P. Sznajder, D. Neyret, T. Michigami, H. Schmieden, A. Amoroso, M. Büchele, A. Lehmann, J.M. Friedrich, J. Nový, N. Kuchinski, J.H. Koivuniemi, K. Königsmann, S.-U. Chung, R. Birsa, J. Bisplinghoff, A. Sandacz, K. Bicker, A. Maggiora, Yu. Ivanshin, S. Huber, V. Duic, Takahiro Iwata, W. Dünnweber, E. Zemlyanichkina, K. Schmidt, François Herrmann, M. Ziembicki, P. Jörg, Norihiro Doshita, N. d'Hose, A. Rychter, Aram Kotzinian, R. Longo, V.N. Kolosov, K. Schönning, F. H. Heinsius, O.Yu. Shevchenko, S. Levorato, M. Slunecka, Alexandr Selyunin, G.V. Khaustov, J. ter Wolbeek, W. Eyrich, C. Franco, Naomi C R Makins, Nour Makke, W. C. Chang, Y. Bedfer, F. Tessarotto, Federica Sozzi, M. Krämer, S. Schopferer, M. Quaresma, M. Finger, W.-D. Nowak, D.V. Peshekhonov, Anne-Laure Martin, E. Fuchey, I. Gnesi, F. Giordano, E. Burtin, Jan Matousek, V.F. Konstantinov, J. Lichtenstadt, S. Ishimoto, H. Fischer, V. Andrieux, Adam Szabelski, V. Tskhay, A. Nagaytsev, F. Balestra, W. Meyer, Maria Liz Crespo, V. Jary, Andrew Ivanov, D. von Harrach, F. Thibaud, J. Barth, Gerhard K. Mallot, T. Weisrock, F. Haas, C. Riedl, E. M. Kabuß, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Courant Institute of Mathematical Sciences [New York] (CIMS), New York University [New York] (NYU), NYU System (NYU)-NYU System (NYU), National Center for High-Performance Computing, Max-Planck-Institut für Radioastronomie (MPIFR), Department of Mathematics, King's College London, IBM Research [Zurich], Centre de Recherche sur la Conservation (CRC ), Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de chimie théorique (LCT), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), DCC - Departemento de Ciencias da Computação, Universidade Federal de Minas Gerais = Federal University of Minas Gerais [Belo Horizonte, Brazil] (UFMG), Centre de recherche et de restauration des musées de France (C2RMF), Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Federal University of Minas Gerais (UFMG), Centre National de la Recherche Scientifique (CNRS)-Ministère de la Culture et de la Communication (MCC), Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badełek, B., Balestra, F., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, Renato, Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, Franco, Braun, C., Bressan, Andrea, Büchele, M., Burtin, E., Chang, W. C., Chiosso, M., Choi, I., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., DALLA TORRE, Silvia, Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, O. Yu, Dhara, L., Donskov, S. V., Doshita, N., Duic, Venicio, Dünnweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giordano, F., Gnesi, I., Gorzellik, M., Grabmüller, S., Grasso, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Horikawa, N., D'Hose, N., Hsieh, C. Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Joosten, R., Jörg, P., Kabuß, E., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Krämer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kuchinski, N., Kuhn, R., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, Stefano, Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, Nour, Mallot, G. K., Marchand, C., Marianski, B., Martin, Anna, Marzec, J., Matousek, Jan, Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Miyachi, Y., Montuenga, P., Nagaytsev, A., Nerling, F., Neyret, D., Nikolaenko, V. I., Nový, J., Nowak, W. D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. C., Pereira, F., Pešek, M., Peshekhonov, D. V., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Rossiyskaya, N. S., Ryabchikov, D. I., Rychter, A., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sbrizzai, Giulio, Schiavon, Paolo, Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Selyunin, A., Shevchenko, O. Y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sozzi, Federica, Srnka, A., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, Stefano, Tessaro, S., Tessarotto, Fulvio, Thibaud, F., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: Nuclear and High Energy Physics, Particle physics, Photon, High pT, Hadron, Nuclear Theory, COMPASS, Deep inelastic scattering, Double spin asymmetry, δG, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Lambda, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, 010306 general physics, Nuclear Experiment, Physics, Muon, 010308 nuclear & particles physics, lcsh:QC1-999, Gluon, High Energy Physics - Phenomenology, Deuterium, High Energy Physics::Experiment, Nucleon, lcsh:Physics, Particle Physics - Experiment
Abstract: We measured the longitudinal double spin asymmetries $A_{LL}$ for single hadron muo-production off protons and deuterons at photon virtuality $Q^2$ < 1(GeV/$\it c$)$^2$ for transverse hadron momenta $p_T$ in the range 0.7 GeV/$\it c$ to 4 GeV/$\it c$ . They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/$\it c$ or 200 GeV/$\it c$ impinging on polarised $\mathrm{{}^6LiD}$ or $\mathrm{NH_3}$ targets. The experimental asymmetries are compared to next-to-leading order pQCD calculations, and are sensitive to the gluon polarisation $\Delta G$ inside the nucleon in the range of the nucleon momentum fraction carried by gluons $0.05 < x_g < 0.2$. We measured the longitudinal double spin asymmetries ALL for single hadron muoproduction off protons and deuterons at photon virtuality Q2
Published: 2016

27. The spin-dependent structure function of the proton g1p and a test of the Bjorken sum rule

Author: P. Schiavon, I. Konorov, C. Hess, Miroslav Sulc, M. Ziembicki, F. Hinterberger, F.H. Heinsius, Achim Richter, A. Magnon, F. Massmann, S. Ramos, Norihiro Doshita, N. d'Hose, Alan D. Martin, D. Kang, K. Königsmann, Soumen Paul, T. Hasegawa, E. Rondio, A. Austregesilo, R. Gazda, A. Maggiora, E. Perevalova, R. Kuhn, A. N. Sissakian, S. Das, A.G. Olshevsky, R. Jahn, A. Ferrero, A. Maximov, C. Quintans, D. Cotic, M.P. Bussa, V.D. Samoylenko, O.P. Gavrichtchouk, Vladimir A. Polyakov, D. Neyret, Elena Rocco, J. Polak, W. Kafer, J.H. Koivuniemi, R. Joosten, L. Sinha, S. Neubert, A. Korzenev, T. Matsuda, K. Zaremba, Laura Silva, A.A. Lednev, A. Mutter, A. Lehmann, J. Ball, J. M. Le Goff, S. Platchkov, O. Kouznetsov, Yu.V. Mikhailov, A. Král, R. Windmolders, S. Sarkar, R. Bertini, Franco Bradamante, B. Pawlukiewicz-Kaminska, S.S. Dasgupta, M. V. Zavertyaev, C. Marchand, V. Rapatsky, A. Nagaytsev, F. Balestra, A. Srnka, L. Lauser, S. Grabmüller, W. Wislicki, J. Pochodzalla, V. Duic, G. Sbrizzai, A. Padee, F. Tessarotto, Moinester, P. Jasinski, O.Yu. Denisov, V. Diaz, T. Negrini, J. Marzec, G. Piragino, S. Uhl, P.D. Eversheim, G.B. Pontecorvo, K. Klimaszewski, M. Maggiora, P. Bordalo, F. Nerling, A. Amoroso, M. Chiosso, F. Haas, R. Geyer, Jean-Francois Rajotte, Takahiro Iwata, D.I. Ryabchikov, D. von Harrach, M. Giorgi, A.S. Nunes, S. Koblitz, Andres Cicuttin, L. Schmitt, T. Nagel, D. Panzieri, J. Pretz, T. Schlüter, A. El Alaoui, S. Gerassimov, M. Krämer, N. Horikawa, J. Zhao, K. Kondo, M.G. Alekseev, Sergey Donskov, T. Liška, G. Reicherz, H.-W. Siebert, F. Kunne, R. Gushterski, W. Eyrich, M. Virius, S. Tessaro, V.F. Konstantinov, Johannes Bernhard, A. Guskov, Y. Bedfer, G.V. Khaustov, A. Zvyagin, T. Michigami, S. Dalla Torre, E. Burtin, H. Santos, Q. Weitzel, M. Bettinelli, M. Slunecka, A. Sandacz, B. Gobbo, I.A. Savin, Andrea Bressan, W. Schröder, N. I. Zhuravlev, Ch. Höppner, Yu.A. Khokhlov, A. M. Kotzinian, W. Meyer, Maria Liz Crespo, H. Fischer, M. L. Colantoni, C. Ilgner, J. Barth, R. Konopka, A. Teufel, S. Schopferer, N.V. Vlassov, Günter Baum, M.G. Sapozhnikov, O.Yu. Shevchenko, S. Levorato, Yu. Kisselev, D. Chaberny, S.-U. Chung, V.N. Kolosov, V.I. Nikolaenko, D.V. Peshekhonov, J. Marroncle, A.V. Efremov, R. Garfagnini, Z.V. Kroumchtein, François Herrmann, A. Bravar, A. Mann, M. Ostrick, G. Jegou, K. Kurek, E. Kabuss, Oleg V. Ivanov, R. Hermann, H. Wollny, S. Sosio, Christian Schill, I. Uman, G. Pesaro, S. Takekawa, Yu. Alexandrov, J. Lichtenstadt, M. Stolarski, I. Gnesi, Bakur Parsamyan, G.I. Smirnov, Fabrice Gautheron, M. A. Faessler, R. Panknin, V.Yu. Alexakhin, A. Grasso, R. Sulej, M. Finger, C. Franco, R. Birsa, G. D. Alexeev, W. Dünnweber, J.M. Friedrich, J. Bisplinghoff, E. Zemlyanichkina, L. Dhara, B. Badelek, B. Ketzer, F. Robinet, A. Filin, Grzegorz Brona, Gerhard K. Mallot, A. Vossen, F. Sozzi, J. Nassalski, S. Ishimoto, Frank Klein, K. Kowalik, Yu. Ivanshin, L. G. Tkatchev, S. Goertz, and B. Grube
Subjects: Quantum chromodynamics, Physics, Coupling constant, Nuclear and High Energy Physics, Particle physics, Muon, Isovector, Proton, 010308 nuclear & particles physics, Deep inelastic scattering, 01 natural sciences, Nuclear physics, 0103 physical sciences, Sum rule in quantum mechanics, 010306 general physics, Spin-½
Abstract: The inclusive double-spin asymmetry, A 1 p , has been measured at COMPASS in deep-inelastic polarised muon scattering off a large polarised NH3 target. The data, collected in the year 2007, cover the range Q 2 > 1 ( GeV / c ) 2 , 0.004 x 0.7 and improve the statistical precision of g 1 p ( x ) by a factor of two in the region x 0.02 . The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g 1 NS ( x , Q 2 ) . The isovector quark density, Δ q 3 ( x , Q 2 ) , is evaluated from a NLO QCD fit of g 1 NS . The first moment of Δ q 3 is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants | g A / g V | = 1.28 ± 0.07 ( stat . ) ± 0.10 ( syst. ) .
Published: 2010

28. Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries

Author: F. Tessarotto, F. Perrot-Kunne, W. Kröger, E. Burtin, K. Zaremba, Jay Roberts, J. Cranshaw, T. Matsuda, M. Plo, I. Sabo, M. Grosse Perdekamp, A. Karev, K. Haft, V. G. Krivokhijine, S. K. Dhawan, J. Lichtenstadt, S. Platchkov, N. de Botton, Victor Kukhtin, H. Gilly, M. Lamanna, J. H. Moromisato, Clemens A. Heusch, J. S. McCarthy, G. Igo, A. Steinmetz, Patrick Hautle, S. Bültmann, R. Birsa, F. Feinstein, D. von Harrach, J. E.J. Oberski, Takahiro Iwata, A. Ogawa, A. Schiller, D. Thers, Yu. Kisselev, G. Reicherz, D. Crabb, J. A. Garzon, C. Dulya, Naoaki Horikawa, Franco Bradamante, T. Akdogan, B. Roscherr, S. Dalla Torre, H. J. Kessler, G. Bardin, L. Betev, Roland Windmolders, J. Martino, Abhay Deshpande, C. S. Özben, M. Velasco, A. Arvidson, Rudiger Voss, J. Nassalski, M. Giorgi, U. Stiegler, T. Hasegawa, I.A. Savin, D. J. Miller, P. Schiavon, Andrea Bressan, Michal Szleper, A. Gallas, G. K. Mallot, J. Vogt, E. Arik, B. W. Mayes, T. O. Niinikoski, S. Ishimoto, Lawrence Pinsky, A. Witzmann, Y. Miyachi, St. Goertz, F. Lehar, G. Unel, B. Frois, H. Postma, R. van Dantzig, Matias Rodriguez, E. P. Sichtermann, F. Simeoni, G.I. Smirnov, J. Saborido, R. Puntaferro, D. Fasching, G. van Middelkoop, Jinkui Zhao, D. Pose, W. Meyer, Kunikazu Mori, C. A. Whitten, J. Kyynäräinen, A. de Lesquen, J. Pretz, K. Medved, Regine Willumeit, H. Pereira, W. Tlaczala, A. Tripet, G. Gracia, A. Sandacz, N. De Groot, K. Kurek, Anna Zanetti, F. Marie, T. Kageya, A. Rijllart, Bernardo Adeva, E. Rondio, T. Çuhadar, J. M. Le Goff, Heinrich B. Stuhrmann, A. Magnon, J. Ylöstalo, L. Naumann, M. Litmaath, Günter Baum, P. Berglund, B. Derro, E. von Goeler, D. Krämer, W. Wislicki, G. Rädel, S. Eichblatt, Alan D. Martin, B. Badelek, C. Fernandez, N. Hayashi, D. Peshekhonov, A. Bravar, V. W. Hughes, Ulrich Landgraf, A. Staude, T. J. Ketel, S. Forthmann, J. Kiryluk, E. M. Kabuß, (Astro)-Particles Physics, B., Adeva, T., Akdogan, E., Arik, A., Arvidson, B., Badelek, G., Bardin, G., Baum, P., Berglund, L., Betev, R., Birsa, N., de Botton, Bradamante, Franco, A., Bravar, Bressan, Andrea, S., Bültmann, E., Burtin, D., Crabb, J., Cranshaw, T., Çuhadar, DALLA TORRE, Silvia, R., van Dantzig, B., Derro, A., Deshpande, S., Dhawan, C., Dulya, S., Eichblatt, D., Fasching, F., Feinstein, C., Fernandez, S., Forthmann, B., Froi, A., Galla, J. A., Garzon, H., Gilly, Giorgi, Marcello, E., von Goeler, S., Goertz, G., Gracia, N., de Groot, M., Grosse Perdekamp, K., Haft, D., von Harrach, T., Hasegawa, P., Hautle, N., Hayashi, C. A., Heusch, N., Horikawa, V. W., Hughe, G., Igo, S., Ishimoto, T., Iwata, E. M., Kabuß, T., Kageya, A., Karev, H. J., Kessler, T. J., Ketel, J., Kiryluk, Kisselev, Y. u., D., Krämer, V., Krivokhijine, W., Kröger, V., Kukhtin, K., Kurek, J., Kyynäräinen, M., Lamanna, U., Landgraf, J. M., Le Goff, F., Lehar, A., de Lesquen, J., Lichtenstadt, M., Litmaath, A., Magnon, G. K., Mallot, F., Marie, Martin, Anna, J., Martino, T., Matsuda, B., Maye, J. S., Mccarthy, K., Medved, W., Meyer, G., van Middelkoop, D., Miller, Y., Miyachi, K., Mori, J., Moromisato, J., Nassalski, L., Naumann, T. O., Niinikoski, J. E. J., Oberski, A., Ogawa, C., Ozben, H., Pereira, F., Perrot Kunne, D., Peshekhonov, L., Pinsky, S., Platchkov, M., Plo, D., Pose, H., Postma, J., Pretz, R., Puntaferro, G., Rädel, A., Rijllart, G., Reicherz, J., Robert, M., Rodriguez, E., Rondio, B., Roscherr, I., Sabo, J., Saborido, A., Sandacz, I., Savin, Schiavon, Paolo, A., Schiller, E. P., Sichtermann, F., Simeoni, G. I., Smirnov, A., Staude, A., Steinmetz, U., Stiegler, H., Stuhrmann, M., Szleper, F., Tessarotto, D., Ther, W., Tlaczala, A., Tripet, G., Unel, M., Velasco, J., Vogt, R., Vo, C., Whitten, R., Windmolder, R., Willumeit, W., Wislicki, A., Witzmann, J., Ylöstalo, Zanetti, ANNA MARIA, K., Zaremba, and J., Zhao
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Muon, Valence (chemistry), SMC, Hadron, FOS: Physical sciences, SIDIS, Polarized quark distributions, Deep inelastic scattering, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Deuterium, High Energy Physics::Experiment, Nucleon, Particle Physics - Experiment
Abstract: We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering of polarised muons on polarised protons and deuterons in the range $0.003$1 GeV$^2$. Compared to our previous publication on this subject, with the new data the statistical errors have been reduced by nearly a factor of two. From these asymmetries and our inclusive spin asymmetries we determine the polarised quark distributions of valence quarks and non-strange sea quarks at $Q^2$=10 GeV$^2$. The polarised $u$ valence quark distribution, $\Delta u_v(x)$, is positive and the polarisation increases with $x$. The polarised $d$ valence quark distribution, $\Delta d_v(x)$, is negative and the non-strange sea distribution, $\Delta \bar q(x)$, is consistent with zero over the measured range of $x$. We find for the first moments $\int_0^1 \Delta u_v(x) dx = 0.77 \pm 0.10 \pm 0.08$, $\int_0^1 \Delta d_v(x) dx = -0.52 \pm 0.14 \pm 0.09$ and $\int_0^1 \Delta \bar q(x) dx= 0.01 \pm 0.04 \pm 0.03$, where we assumed $\Delta \bar u(x) = \Delta \bar d(x)$. We also determine for the first time the second moments of the valence distributions $\int_0^1 x \Delta q_v(x) dx$., Comment: 17 pages
Published: 1998

29. The spin-dependent structure function g1(x) of the deuteron from polarized deep-inelastic muon scattering

Author: S. Bültmann, T. Kageya, M. Boutemeur, D. Fasching, T. Pussieux, A. Bressan, J. E.J. Oberski, E. M. Kabuß, E. Burtin, T. Matsuda, D.V. Peshekhonov, K. M. Teichert, I. Sabo, Jay Roberts, I.A. Savin, V. G. Krivokhijine, J. Nassalski, J. Zhao, N. de Botton, Victor Kukhtin, A. Bravar, B. W. Mayes, E. Arik, R. Seitz, G. Gratia, W. Tlaczala, J. Cranshaw, H. J. Kessler, Roland Windmolders, M. Lowe, A. Arvidson, J. Martino, A. Gallas, A. Nagaitsev, G. K. Mallot, M. Lamanna, Y. Ylöstalo, David Miller, Aina Yañez, G. Bardin, Drew Parks, L. Naumann, G. Unel, T. O. Niinikoski, J. Lichtenstadt, J. Kyynäräinen, F. Tessarotto, W. Kröger, H. Postma, J. Kiryluk, J. Saborido, M. Litmaath, L. S. Pinsky, P. Schiavon, N. Horikawa, B. Derro, D. von Harrach, M. K. Ballintijn, D. Krämer, Abhay Deshpande, F. Sever, R. Puntaferro, K. P. Schüler, E. Rondio, J. H. Moromisato, Satish Dhawan, G. Baum, F. Feinstein, T. Iwata, Yannis K. Semertzidis, J. Pyrlik, Mayda Velasco, L. Betev, S. Eichblatt, A. Witzmann, Patrick Hautle, P. Björkholm, T. Hasegawa, S. Dalla Torre, J. C. Faivre, L. Klostermann, J. M. Le Goff, F. Marie, J. S. McCarthy, C. Cavata, Regine Willumeit, Matias Rodriguez, C. Dulya, G. van Middelkoop, A. Ogawa, P. Berglund, B. Frois, S. Platchkov, Roy Weinstein, N. De Groot, J. Vogt, E. von Goeler, P. Shanahan, A. Kishi, A. Rosado, G. Rädel, G. Igo, S. Rock, T. Gaussiran, L. V. Kalinovskaya, Clemens A. Heusch, F. Simeoni, G.I. Smirnov, Ricardo Piegaia, T. Çuhadar, A. de Lesquen, J. Pretz, J. A. Garzon, Franco Bradamante, D. Y. Bardin, M. Giorgi, J. Polec, B. Badelek, C. Fernandez, R. Birsa, N. Hayashi, A. Sandacz, F. Perrot-Kunne, C.S. Ozben, S. Trentalange, D. G. Crabb, Yu. Kisselev, W. Wislicki, A. Steinmetz, T. Lindqvist, D. L. Adams, T. Akdogan, D. Pose, A. Rijllart, Bernardo Adeva, A. Dyring, Heinrich B. Stuhrmann, A. Staude, T. J. Ketel, V. W. Hughes, Ulrich Landgraf, A. Karev, F. Lehar, A. Magnon, A. Tripet, B. E. Bonner, M. Grosse-Perdekamp, Rudiger Voss, Michal Szleper, S. Ishimoto, R. van Dantzig, I. G. Bird, E. P. Sichtermann, K. Zaremba, M. Plo, U. Stiegler, Faustino Gómez, Kunikazu Mori, K. Medved, Anna Zanetti, K. Kurek, C. A. Whitten, Anne-Laure Martin, (Astro)-Particles Physics, D., Adam, B., Adeva, T., Akdogan, E., Arik, A., Arvidson, B., Badelek, M. K., Ballintijn, D., Bardin, G., Bardin, G., Baum, P., Berglund, L., Betev, I. G., Bird, Birsa, Renato, P., Björkholm, B. E., Bonner, N., de Botton, M., Boutemeur, Bradamante, Franco, A., Bravar, Bressan, Andrea, S., Bültmann, E., Burtin, C., Cavata, D., Crabb, J., Cranshaw, T., Çuhadar, DALLA TORRE, Silvia, R., van Dantzig, B., Derro, A., Deshpande, S., Dhawan, C., Dulya, A., Dyring, S., Eichblatt, J. C., Faivre, D., Fasching, F., Feinstein, C., Fernandez, B., Froi, A., Galla, J. A., Garzon, T., Gaussiran, Giorgi, Marcello, E., von Goeler, F., Gomez, G., Gracia, N., de Groot, M., Grosse Perdekamp, D., von Harrach, T., Hasegawa, P., Hautle, N., Hayashi, C. A., Heusch, N., Horikawa, V. W., Hughe, G., Igo, S., Ishimoto, T., Iwata, E. M., Kabuß, T., Kageya, L., Kalinovskaya, A., Karev, H. J., Kessler, T. J., Ketel, J., Kiryluk, A., Kishi, Kisselev, Y. u., L., Klostermann, D., Krämer, V., Krivokhijine, W., Kröger, V., Kukhtin, K., Kurek, J., Kyynäräinen, M., Lamanna, U., Landgraf, J. M., Le Goff, F., Lehar, A., de Lesquen, J., Lichtenstadt, T., Lindqvist, M., Litmaath, M., Lowe, A., Magnon, G. K., Mallot, F., Marie, Martin, Anna, J., Martino, T., Matsuda, B., Maye, J. S., Mccarthy, K., Medved, G., van Middelkoop, D., Miller, K., Mori, J., Moromisato, A., Nagaitsev, J., Nassalski, L., Naumann, T. O., Niinikoski, J. E. J., Oberski, A., Ogawa, C., Ozben, D. P., Park, F., Perrot Kunne, D., Peshekhonov, R., Piegaia, L., Pinsky, S., Platchkov, M., Plo, J., Polec, D., Pose, H., Postma, J., Pretz, R., Puntaferro, T., Pussieux, J., Pyrlik, G., Rädel, G., Rijllart, J. B., Robert, S., Rock, M., Rodriguez, E., Rondio, A., Rosado, I., Sabo, J., Saborido, A., Sandacz, I., Savin, Schiavon, Paolo, K. P., Schüler, R., Seitz, Y., Semertzidi, F., Sever, P., Shanahan, E. P., Sichtermann, Simeoni, Fabrizio, G. I., Smirnov, A., Staude, A., Steinmetz, U., Stiegler, H., Stuhrmann, M., Szleper, K. M., Teichert, F., Tessarotto, W., Tlaczala, S., Trentalange, A., Tripet, G., Unel, M., Velasco, J., Vogt, R., Vo, R., Weinstein, C., Whitten, R., Windmolder, R., Willumeit, W., Wislicki, A., Witzmann, A., Yañez, Y., Ylöstalo, Zanetti, ANNA MARIA, K., Zaremba, and J., Zhao
Subjects: Physics, DIS, Nuclear and High Energy Physics, Strange quark, Muon, SMC, Scattering, g1 structure function, Perturbative QCD, Deep inelastic scattering, Nuclear physics, High Energy Physics::Experiment, Sum rule in quantum mechanics, Nucleon, Particle Physics - Experiment, Spin-½
Abstract: We present a new measurement of the spin-dependent structure function $g_{1}^{\rm d}$ of the deuteron from deep inelastic scattering of 190 GeV polarized muons on polarized deuterons. The results are combined with our previous measurements of $g_{1}^{\rm d}$. A perturbative QCD evolution in next-to-leading order is used to compute $g_{1}^{\rm d}(x)$ at a constant $Q^{2}$. At $Q^{2} = 10$ GeV$^{2}$, we obtain a first moment $\Gamma_{1}^{\rm d} = \int_{0}^{1} g_{1}^{\rm d}{\rm d}x = 0.041 \pm 0.008$, a flavour-singlet axial charge of the nucleon $a_{0} = 0.30 \pm 0.08$, and an axial charge of the strange quark $a_{s} = -0.09 \pm 0.03$. Using our earlier determination of $\Gamma_{1}^{\rm p}$, we obtain $\Gamma_1^{\rm p} - \Gamma_1^{\rm n} = 0.183 \pm 0.035$ at $Q^2 = 10\,\mbox{GeV}^2$. This result is in agreement with the Bjorken sum rule which predicts $\Gamma_1^{\rm p} - \Gamma_1^{\rm n} = 0.186 \pm 0.002$ at the same $Q^2$.
Published: 1997

30. The COMPASS experiment at CERN

Author: P. Abbon, E. Albrecht, V.Yu. Alexakhin, Yu. Alexandrov, G.D. Alexeev, M.G. Alekseev, A. Amoroso, H. Angerer, V.A. Anosov, B. Badełek, F. Balestra, J. Ball, J. Barth, G. Baum, M. Becker, Y. Bedfer, P. Berglund, C. Bernet, R. Bertini, M. Bettinelli, R. Birsa, J. Bisplinghoff, P. Bordalo, M. Bosteels, F. Bradamante, A. Braem, A. Bravar, A. Bressan, G. Brona, E. Burtin, M.P. Bussa, V.N. Bytchkov, M. Chalifour, A. Chapiro, M. Chiosso, P. Ciliberti, A. Cicuttin, M. Colantoni, A.A. Colavita, S. Costa, M.L. Crespo, P. Cristaudo, T. Dafni, N. d’Hose, S. Dalla Torre, C. d’Ambrosio, S. Das, S.S. Dasgupta, E. Delagnes, R. De Masi, P. Deck, N. Dedek, D. Demchenko, O.Yu. Denisov, L. Dhara, V. Diaz, N. Dibiase, A.M. Dinkelbach, A.V. Dolgopolov, A. Donati, S.V. Donskov, V.A. Dorofeev, N. Doshita, D. Durand, V. Duic, W. Dünnweber, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, V. Falaleev, P. Fauland, A. Ferrero, L. Ferrero, M. Finger, H. Fischer, C. Franco, J. Franz, F. Fratnik, J.M. Friedrich, V. Frolov, U. Fuchs, R. Garfagnini, L. Gatignon, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, J.M. Gheller, A. Giganon, M. Giorgi, B. Gobbo, S. Goertz, A.M. Gorin, F. Gougnaud, S. Grabmüller, O.A. Grajek, A. Grasso, B. Grube, A. Grünemaier, A. Guskov, F. Haas, R. Hagemann, J. Hannappel, D. von Harrach, T. Hasegawa, J. Heckmann, S. Hedicke, F.H. Heinsius, R. Hermann, C. Heß, F. Hinterberger, M. von Hodenberg, N. Horikawa, S. Horikawa, I. Horn, C. Ilgner, A.I. Ioukaev, S. Ishimoto, I. Ivanchin, O. Ivanov, T. Iwata, R. Jahn, A. Janata, R. Joosten, N.I. Jouravlev, E. Kabuß, V. Kalinnikov, D. Kang, F. Karstens, W. Kastaun, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, J. Kiefer, Yu. Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J.H. Koivuniemi, V.N. Kolosov, E.V. Komissarov, K. Kondo, K. Königsmann, A.K. Konoplyannikov, I. Konorov, V.F. Konstantinov, A.S. Korentchenko, A. Korzenev, A.M. Kotzinian, N.A. Koutchinski, O. Kouznetsov, K. Kowalik, D. Kramer, N.P. Kravchuk, G.V. Krivokhizhin, Z.V. Kroumchtein, J. Kubart, R. Kuhn, V. Kukhtin, F. Kunne, K. Kurek, N.A. Kuzmin, M. Lamanna, J.M. Le Goff, M. Leberig, A.A. Lednev, A. Lehmann, V. Levinski, S. Levorato, V. I Lyashenko, J. Lichtenstadt, T. Liska, I. Ludwig, A. Maggiora, M. Maggiora, A. Magnon, G.K. Mallot, A. Mann, I.V. Manuilov, C. Marchand, J. Marroncle, A. Martin, J. Marzec, L. Masek, F. Massmann, T. Matsuda, D. Matthiä, A.N. Maximov, G. Menon, W. Meyer, A. Mielech, Yu.V. Mikhailov, M.A. Moinester, F. Molinié, F. Mota, A. Mutter, T. Nagel, O. Nähle, J. Nassalski, S. Neliba, F. Nerling, D. Neyret, M. Niebuhr, T. Niinikoski, V.I. Nikolaenko, A.A. Nozdrin, A.G. Olshevsky, M. Ostrick, A. Padee, P. Pagano, S. Panebianco, B. Parsamyan, D. Panzieri, S. Paul, B. Pawlukiewicz, H. Pereira, D.V. Peshekhonov, V.D. Peshekhonov, D. Piedigrossi, G. Piragino, S. Platchkov, K. Platzer, J. Pochodzalla, J. Polak, V.A. Polyakov, G. Pontecorvo, A.A. Popov, J. Pretz, S. Procureur, C. Quintans, J.-F. 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Zvyagin, Abbon, P, Albrecht, E, ALEXAKHIN V., Yu, Alexandrov, Yu, ALEXEEV G., D, ALEKSEEV M., G, Amoroso, A, Angerer, H, ANOSOV V., A, Badelek, B, Balestra, F, Ball, J, Barth, J, Baum, G, Becker, M, Bedfer, Y, Berglund, P, Bernet, C, Bertini, R, Bettinelli, M, Birsa, R, Bisplinghoff, J, Bordalo, P, Bosteels, M, Bradamante, Franco, Braem, A, Bravar, A, Bressan, Andrea, Brona, G, Burtin, E, BUSSA M., P, BYTCHKOV V., N, Chalifour, M, Chapiro, A, Chiosso, M, Ciliberti, Piero, Cicuttin, A, Colantoni, M, COLAVITA A., A, Costa, S, CRESPO M., L, Cristaudo, P, Dafni, T, D'Hose, N, DALLA TORRE, S, D'Ambrosio, C, Das, S, DASGUPTA S., S, Delagnes, E, DE MASI, R, Deck, P, Dedek, N, Demchenko, D, DENISOV O., Yu, Dhara, L, Diaz, V, Dibiase, N, DINKELBACH A., M, DOLGOPOLOV A., V, Donati, A, DONSKOV S., V, DOROFEEV V., A, Doshita, N, Durand, D, Duic, V, Dünnweber, W, Efremov, A, EVERSHEIM P., D, Eyrich, W, Faessler, M, Falaleev, V, Fauland, P, Ferrero, A, Ferrero, L, Finger, M, FINGER M., Jr, Fischer, H, Franco, C, Franz, J, Fratnik, F, FRIEDRICH J., M, Frolov, V, Fuchs, U, Garfagnini, R, Gatignon, L, Gautheron, F, GAVRICHTCHOUK O., P, Gerassimov, S, Geyer, R, GHELLER J., M, Giganon, A, Giorgi, Marcello, Gobbo, B, Goertz, S, GORIN A., M, Gougnaud, F, Grabmüller, S, GRAJEK O., A, Grasso, A, Grube, B, Grünemaier, A, Guskov, A, Haas, F, Hagemann, R, Hannappel, J, VON HARRACH, D, Hasegawa, T, Heckmann, J, Hedicke, S, HEINSIUS F., H, Hermann, R, Hess, C, Hinterberger, F, VON HODENBERG, M, Horikawa, N, Horikawa, S, Horn, I, Ilgner, C, IOUKAEV A., I, Ishimoto, S, Ivanchin, I, Ivanov, O, Iwata, T, Jahn, R, Janata, A, Joosten, R, JOURAVLEV N., I, Kabuss, E, Kalinnikov, V, Kang, D, Karstens, F, Kastaun, W, Ketzer, B, KHAUSTOV G., V, KHOKHLOV Y. U., A, Kiefer, J, Kisselev, Yu, Klein, F, Klimaszewski, K, Koblitz, S, KOIVUNIEMI J., H, KOLOSOV V., N, KOMISSAROV E., V, Kondo, K, Königsmann, K, KONOPLYANNIKOV A., K, Konorov, I, KONSTANTINOV V., F, KORENTCHENKO A., S, Korzenev, A, KOTZINIAN A., M, KOUTCHINSKI N., A, Kouznetsov, O, Kowalik, K, Kramer, D, KRAVCHUK N., P, KRIVOKHIZHIN G., V, KROUMCHTEIN Z., V, Kubart, J, Kuhn, R, Kukhtin, V, Kunne, F, Kurek, K, KUZMIN N., A, Lamanna, M, LE GOFF J., M, Leberig, M, LEDNEV A., A, Lehmann, A, Levinski, V, Levorato, Stefano, I., LYASHENKO V, Lichtenstadt, J, Liska, T, Ludwig, I, Maggiora, A, Maggiora, M, Magnon, A, MALLOT G., K, Mann, A, MANUILOV I., V, Marchand, C, Marroncle, J, Martin, Anna, Marzec, J, Masek, L, Massmann, F, Matsuda, T, Matthiä, D, MAXIMOV A., N, Menon, G, Meyer, W, Mielech, A, MIKHAILOV Y. U., V, MOINESTER M., A, Molinié, F, Mota, F, Mutter, A, Nagel, T, Nähle, O, Nassalski, J, Neliba, S, Nerling, F, Neyret, D, Niebuhr, M, Niinikoski, T, NIKOLAENKO V., I, NOZDRIN A., A, OLSHEVSKY A., G, Ostrick, M, Padee, A, Pagano, P, Panebianco, S, Parsamyan, B, Panzieri, D, Paul, S, Pawlukiewicz, B, Pereira, H, PESHEKHONOV D., V, PESHEKHONOV V., D, Piedigrossi, D, Piragino, G, Platchkov, S, Platzer, K, Pochodzalla, J, Polak, J, POLYAKOV V., A, Pontecorvo, G, POPOV A., A, Pretz, J, Procureur, S, Quintans, C, RAJOTTE J., F, Ramos, S, Razaq, I, Rebourgeard, P, Reggiani, D, Reicherz, G, Richter, A, Robinet, F, Rocco, E, Rondio, E, Ropelewski, L, ROUSSÉ J., Y, ROZHDESTVENSKY A., M, Ryabchikov, D, SAMARTSEV A., G, SAMOYLENKO V., D, Sandacz, A, SANS MERCE, M, Santos, H, SAPOZHNIKOV M., G, Sauli, F, SAVIN I., A, Schiavon, Paolo, Schill, C, Schmidt, T, Schmitt, H, Schmitt, L, Schönmeier, P, Schroeder, W, Seeharsch, D, Seimetz, M, Setter, D, Shaligin, A, SHEVCHENKO O., Yu, SHISHKIN A., A, SIEBERT H., W, Silva, L, Simon, F, Sinha, L, SISSAKIAN A., N, Slunecka, M, SMIRNOV G., I, Sora, D, Sosio, S, Sozzi, F, Srnka, A, Stinzing, F, Stolarski, M, SUGONYAEV V., P, Sulc, M, Sulej, R, Tarte, G, Takabayashi, N, TCHALISHEV V., V, Tessaro, S, Tessarotto, F, Teufel, A, Thers, D, TKATCHEV L., G, Toeda, T, TOKMENIN V., V, Trippel, S, Urban, J, Valbuena, R, Venugopal, G, Virius, M, VLASSOV N., V, Vossen, A, Wagner, M, Webb, R, Weise, E, Weitzel, Q, Wiedner, U, Wiesmann, M, Windmolders, R, Wirth, S, Wisblicki, W, Wollny, H, ZANETTI A., M, Zaremba, K, Zavertyaev, M, Zhao, J, Ziegler, R, Ziembicki, M, ZLOBIN Y., L, and Zvyagin, A.
Subjects: Nuclear and High Energy Physics, straw tube detector, Physics::Instrumentation and Detectors, Project commissioning, FOS: Physical sciences, fixed-target experiment, RICH detector, hadron structure, High Energy Physics - Experiment, target, MWPC, Nuclear physics, High Energy Physics - Experiment (hep-ex), Compass, Hadron spectroscopy, COMPASS experiment, scintillating fibre detector, Nuclear Experiment, silicon microstrip detectors, Instrumentation, Silicon microstrip detectors, Physics, Large Hadron Collider, Structure function, MicroMegas detector, front-end electronics, DAQ, micromegas detector, drift chamber, Physics::Accelerator Physics, High Energy Physics::Experiment, polarised, GEM detector, calorimetry, Particle Physics - Experiment, polarised DIS
Abstract: The COMPASS experiment makes use of the CERN SPS high-intensitymuon and hadron beams for the investigation of the nucleon spin structure and the spectroscopy of hadrons. One or more outgoing particles are detected in coincidence with the incoming muon or hadron. A large polarized target inside a superconducting solenoid is used for the measurements with the muon beam. Outgoing particles are detected by a two-stage, large angle and large momentum range spectrometer. The setup is built using several types of tracking detectors, according to the expected incident rate, required space resolution and the solid angle to be covered. Particle identification is achieved using a RICH counter and both hadron and electromagnetic calorimeters. The setup has been successfully operated from 2002 onwards using a muon beam. Data with a hadron beam were also collected in 2004. This article describes the main features and performances of the spectrometer in 2004; a short summary of the 2006 upgrade is also given., 84 papes, 74 figures
Published: 2007

31. Spin asymmetry A1d and the spin-dependent structure function g1d of the deuteron at low values of x and Q2

Author: Aram Kotzinian, R. Windmolders, M.G. Sapozhnikov, S. Neliba, L. Schmitt, A. Janata, J. Zhao, E. Burtin, J. Lichtenstadt, R. Geyer, D.V. Peshekhonov, P. Schiavon, V.F. Konstantinov, Q. Weitzel, J. Pretz, L. Ferrero, H. Fischer, A.G. Olshevsky, T. Hasegawa, S. Procureur, R. Ziegler, Yu. Alexandrov, A. Chapiro, M. Fabro, V.F. Obraztsov, M. Maggiora, K. Zaremba, D. Neyret, G.I. Smirnov, Fabrice Gautheron, M. A. Faessler, V.A. Polyakov, R. C. Webb, A. Mielech, S. Ishimoto, Frank Klein, Andres Cicuttin, A. Amoroso, G. Reicherz, J. Marzec, St. Goertz, V.Yu. Alexakhin, A. Korzenev, Colin Bernet, Massimo Lamanna, Yu. Kisselev, A. Sandacz, A. Srnka, R. Sulej, C. Ilgner, S. Platchkov, S. Dalla Torre, V.P. Sugonyaev, N.P. Kravchuk, A. Bravar, M. Ostrick, I. Konorov, M. Stolarski, C. Quintans, Grzegorz Brona, Gerhard K. Mallot, A. Zvyagin, Murray Moinester, S. Ramos, Alessandro Bressan, F. Tessarotto, E. M. Kabuß, A.M. Rozhdestvensky, N. V. Khomutov, A. Gorin, I.A. Savin, T. Matsuda, T. Iwata, Z.V. Kroumchtein, F. Sozzi, D. von Harrach, F. Balestra, Franco Bradamante, F.H. Heinsius, Norihiro Doshita, S. Gerassimov, W. Eyrich, J. Ball, L. G. Tkatchev, V. Falaleev, N. Horikawa, H.-W. Siebert, Yu.V. Mikhailov, S. Koblitz, N. d'Hose, E.V. Komissarov, A. Grasso, Sergey Donskov, S. Paul, V. Diaz Kavka, R. Jahn, A. Magnon, A. N. Sissakian, B. Grube, D. Panzieri, J. Nassalski, O.Yu. Denisov, T. Liška, Yu.A. Khokhlov, I. Ludwig, R. Joosten, K. Kurek, G. D. Alexeev, O.A. Grajek, Miroslav Sulc, F. Hinterberger, C. Marchand, A. Maximov, W. Dünnweber, M. Virius, J.M. Friedrich, V.D. Samoylenko, E. Weise, J. Pochodzalla, M.L. Colantoni, S. Hedicke, O.P. Gavrichtchouk, L. Sinha, J. Marroncle, S.S. Dasgupta, N. Takabayashi, J. Bisplinghoff, A.I. Ioukaev, E. Rondio, K. Kondo, R. De Masi, P. Bordalo, M.P. Bussa, A.A. Shishkin, G.V. Khaustov, Alan D. Martin, J. Heckmann, J. Franz, S. Wirth, Y. Bedfer, J. Hannappel, Paolo Pagano, Vladimir Peshekhonov, J. M. Le Goff, R. Birsa, N.I. Jouravlev, S. Horikawa, P.D. Eversheim, G. Piragino, V. Duic, W. Meyer, Maria Liz Crespo, M.E. Ladygin, A.A. Nozdrin, C. Heß, M. Giorgi, V. Frolov, V.N. Kolosov, F. Stinzing, N.A. Koutchinski, R. Kuhn, D. Kang, K. Königsmann, Christian Schill, A. Padee, O. Nähle, R. Bertini, A.B. Sadovski, R. Hermann, Andrea Ferrero, A. Maggiora, V.A. Dorofeev, L. Dhara, M. Slunecka, B. Badelek, W. Wiślicki, B. Gobbo, A.S. Korentchenko, A.M. Dinkelbach, B. Ketzer, A. Teufel, Oleg V. Ivanov, M. von Hodenberg, F. Kunne, A.A. Popov, N.V. Vlassov, Günter Baum, O.Yu. Shevchenko, V.I. Nikolaenko, R. Garfagnini, M. Finger, V.V. Tchalishev, S. Costa, J.H. Koivuniemi, and S. Panebianco
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Large Hadron Collider, 010308 nuclear & particles physics, media_common.quotation_subject, Structure function, Zero (complex analysis), 01 natural sciences, Asymmetry, Nuclear physics, Deuterium, 0103 physical sciences, COMPASS experiment, 010306 general physics, Spin-½, media_common
Abstract: We present a precise measurement of the deuteron longitudinal spin asymmetry A 1 d and of the deuteron spin-dependent structure function g 1 d at Q 2 1 ( GeV / c ) 2 and 4 × 10 −5 x 2.5 × 10 −2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A 1 d and g 1 d are found to be consistent with zero in the whole range of x.
Published: 2007

32. Study of Σ(1385) and Ξ(1321) hyperon and antihyperon production in deep inelastic muon scattering

Author: C. Adolph, M. G. Alekseev, V. Y. Alexakhin, Y. Alexandrov, G. D. Alexeev, A. Amoroso, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, Y. Bedfer, A. Berlin, J. Bernhard, R. Bertini, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, P. Bordalo, F. Bradamante, C. Braun, A. Bravar, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S. U. Chung, A. Cicuttin, M. L. Crespo, S. Dalla Torre, S. S. Dasgupta, S. Dasgupta, O. Y. Denisov, S. V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, H. Fischer, C. Franco, N. du Fresne von Hohenesche, J. M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O. P. Gavrichtchouk, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, S. Grabmüller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, F. H. Heinsius, F. Herrmann, C. Heß, F. Hinterberger, C. Höppner, N. Horikawa, N. d’Hose, S. Huber, S. Ishimoto, Y. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G. V. Khaustov, Y. A. Khokhlov, Y. Kisselev, F. Klein, K. Klimaszewski, J. H. Koivuniemi, V. N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V. F. Konstantinov, A. M. Kotzinian, O. Kouznetsov, M. Krämer, Z. V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R. P. Kurjata, A. A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G. K. Mallot, A. Mann, C. Marchand, A. Martin, J. Marzec, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Y. V. Mikhailov, Y. Miyachi, A. Morreale, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V. I. Nikolaenko, J. Novy, W.-D. Nowak, A. S. Nunes, A. G. Olshevsky, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V. A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, G. Reicherz, E. Rocco, V. Rodionov, E. Rondio, N. S. Rossiyskaya, D. I. Ryabchikov, V. D. Samoylenko, A. Sandacz, M. G. Sapozhnikov, S. Sarkar, I. A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, A. Schmidt, K. Schmidt, L. Schmitt, H. Schmïden, K. Schönning, S. Schopferer, M. Schott, O. Y. Shevchenko, L. Silva, L. Sinha, S. Sirtl, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, P. Sznajder, S. Takekawa, J. Ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, C., Adolph, M. G., Alekseev, V. Y., Alexakhin, Y., Alexandrov, G. D., Alexeev, A., Amoroso, A., Austregesilo, B., Badełek, F., Balestra, J., Barth, G., Baum, Y., Bedfer, A., Berlin, J., Bernhard, R., Bertini, K., Bicker, J., Bieling, Birsa, Renato, J., Bisplinghoff, P., Bordalo, Bradamante, Franco, C., Braun, A., Bravar, Bressan, Andrea, M., Büchele, E., Burtin, L., Capozza, M., Chiosso, S. U., Chung, A., Cicuttin, M. L., Crespo, S., Dalla Torre, S. S., Dasgupta, S., Dasgupta, O. Y., Denisov, S. V., Donskov, N., Doshita, Duic, Venicio, W., Dünnweber, M., Dziewiecki, A., Efremov, Elia, Carmine, P. D., Eversheim, W., Eyrich, M., Faessler, A., Ferrero, A., Filin, M., Finger, H., Fischer, C., Franco, N., Fresne von hohenesche, J. M., Friedrich, V., Frolov, R., Garfagnini, F., Gautheron, O. P., Gavrichtchouk, S., Gerassimov, R., Geyer, M., Giorgi, I., Gnesi, B., Gobbo, S., Goertz, S., Grabmüller, A., Grasso, B., Grube, R., Gushterski, A., Guskov, T., Guthörl, F., Haa, D., Harrach, F. H., Heinsiu, F., Herrmann, C., Heß, F., Hinterberger, C., Höppner, N., Horikawa, N., D’Hose, S., Huber, S., Ishimoto, Y., Ivanshin, T., Iwata, R., Jahn, V., Jary, P., Jasinski, R., Joosten, E., Kabuß, D., Kang, B., Ketzer, G. V., Khaustov, Y. A., Khokhlov, Y., Kisselev, F., Klein, K., Klimaszewski, J. H., Koivuniemi, V. N., Kolosov, K., Kondo, K., Königsmann, I., Konorov, V. F., Konstantinov, A. M., Kotzinian, O., Kouznetsov, M., Krämer, Z. V., Kroumchtein, N., Kuchinski, F., Kunne, K., Kurek, R. P., Kurjata, A. A., Lednev, A., Lehmann, Levorato, Stefano, J., Lichtenstadt, A., Maggiora, A., Magnon, Makke, Nour, G. K., Mallot, A., Mann, C., Marchand, Martin, Anna, J., Marzec, H., Matsuda, T., Matsuda, G., Meshcheryakov, W., Meyer, T., Michigami, Y. V., Mikhailov, Y., Miyachi, A., Morreale, A., Nagaytsev, T., Nagel, F., Nerling, S., Neubert, D., Neyret, V. I., Nikolaenko, J., Novy, W. D., Nowak, A. S., Nune, A. G., Olshevsky, M., Ostrick, R., Panknin, D., Panzieri, B., Parsamyan, S., Paul, G., Piragino, S., Platchkov, J., Pochodzalla, J., Polak, V. A., Polyakov, J., Pretz, M., Quaresma, C., Quintan, S., Ramo, G., Reicherz, E., Rocco, V., Rodionov, E., Rondio, N. S., Rossiyskaya, D. I., Ryabchikov, V. D., Samoylenko, A., Sandacz, M. G., Sapozhnikov, S., Sarkar, I. A., Savin, Sbrizzai, Giulio, Schiavon, Paolo, C., Schill, T., Schlüter, A., Schmidt, K., Schmidt, L., Schmitt, H., Schmïden, K., Schönning, S., Schopferer, M., Schott, O. Y., Shevchenko, L., Silva, L., Sinha, S., Sirtl, S., Sosio, Sozzi, Federica, A., Srnka, L., Steiger, M., Stolarski, M., Sulc, R., Sulej, H., Suzuki, P., Sznajder, S., Takekawa, J., Wolbeek, Tessaro, Susanna, F., Tessarotto, F., Thibaud, S., Uhl, I., Uman, M., Vandenbroucke, M., Viriu, L., Wang, T., Weisrock, M., Wilfert, R., Windmolder, W., Wiślicki, H., Wollny, K., Zaremba, M., Zavertyaev, E., Zemlyanichkina, N., Zhuravlev, and M., Ziembicki
Subjects: dis, Particle physics, Strange quark, hyperon production, Physics and Astronomy (miscellaneous), di, Lambda, 01 natural sciences, COMPASS, High Energy Physics - Experiment, 0103 physical sciences, CHARGED CURRENT INTERACTIONS, (LAMBDA)OVER-BAR POLARIZATION, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Physics, Muon, 010308 nuclear & particles physics, Generator (category theory), High Energy Physics::Phenomenology, Hyperon, Sigma, Production (computer science), High Energy Physics::Experiment, Particle Physics - Experiment, Bar (unit)
Abstract: Large samples of \Lambda, \Sigma(1385) and \Xi(1321) hyperons produced in deep-inelastic muon scattering off a ^6LiD target were collected with the COMPASS experimental setup at CERN. The relative yields of \Sigma(1385)^+, \Sigma(1385)^-, \bar{\Sigma}(1385)^-, \bar{\Sigma}(1385)^+, \Xi(1321)^-, and \bar{\Xi}(1321)^+ hyperons decaying into \Lambda(\bar{\Lambda})\pi were measured. The heavy hyperon to \Lambda and heavy antihyperon to \bar{\Lambda} yield ratios were found to be in the range 3.8% to 5.6% with a relative uncertainty of about 10%. They were used to tune the parameters relevant for strange particle production of the LEPTO Monte Carlo generator., Comment: 13 pages, 4 figures and 3 tables, 1 Appendix with 3 figures. Version accepted by the Editor
Published: 2013

33. Leading order determination of the gluon polarisation from DIS events with high- hadron pairs

Author: C. Adolph, M. G. Alekseev, V. Y.u. Alexakhin, Y.u. Alexandrov, G. D. Alexeev, A. Amoroso, A. A. Antonov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, Y. Bedfer, J. Bernhard, R. Bertini, M. Bettinelli, K. Bicker, J. Bieling, J. Bisplinghoff, P. Bordalo, C. Braun, A. Bravar, E. Burtin, D. Chaberny, M. Chiosso, S. U. Chung, A. Cicuttin, M. L. Crespo, S. Das, S. S. Dasgupta, O. Y.u. Denisov, L. Dhara, S. V. Donskov, N. Doshita, W. Dünnweber, M. Dziewiecki, A. Efremov, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, H. Fischer, C. Franco, N. du Fresne von Hohenesche, J. M. Friedrich, R. Garfagnini, F. Gautheron, O. P. Gavrichtchouk, R. Gazda, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, S. Grabmüller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, S. Hedicke, F. H. Heinsius, F. Herrmann, C. Heß, F. Hinterberger, N. Horikawa, C.h. Höppner, N. dʼHose, S. Huber, S. Ishimoto, O. Ivanov, Y.u. Ivanshin, T. Iwata, R. Jahn, P. Jasinski, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G. V. Khaustov, Y.u. A. Khokhlov, Y.u. Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J. H. Koivuniemi, V. N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V. F. Konstantinov, A. Korzenev, A. M. Kotzinian, O. Kouznetsov, M. Krämer, Z. V. Kroumchtein, F. Kunne, K. Kurek, L. Lauser, J. M. Le Goff, A. A. Lednev, A. Lehmann, J. Lichtenstadt, A. Maggiora, A. Magnon, G. K. Mallot, A. Mann, C. Marchand, J. Marzec, T. Matsuda, W. Meyer, T. Michigami, Y.u. V. Mikhailov, M. A. Moinester, A. Morreale, A. Mutter, A. Nagaytsev, T. Nagel, J. P. Nassalski, F. Nerling, S. Neubert, D. Neyret, V. I. Nikolaenko, W. D. Nowak, A. S. Nunes, A. G. Olshevsky, M. Ostrick, A. Padee, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, E. Perevalova, D. V. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V. A. Polyakov, G. Pontecorvo, J. Pretz, S. L. Procureur, M. Quaresma, C. Quintans, J. F. Rajotte, S. Ramos, V. Rapatsky, G. Reicherz, A. Richter, E. Rocco, E. Rondio, N. S. Rossiyskaya, D. I. Ryabchikov, V. D. Samoylenko, A. Sandacz, M. G. Sapozhnikov, S. Sarkar, I. A. Savin, C. Schill, T. Schlüter, K. Schmidt, L. Schmitt, K. Schönning, S. Schopferer, M. Schott, O. Y.u. Shevchenko, L. Silva, L. Sinha, A. N. Sissakian, M. Slunecka, G. I. Smirnov, S. Sosio, A. Srnka, M. Stolarski, M. Sulc, R. Sulej, P. Sznajder, S. Takekawa, J. Ter Wolbeek, S. Tessaro, F. Tessarotto, L. G. Tkatchev, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, N. V. Vlassov, L. Wang, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, N. Zhuravlev, A. Zvyagin, BIRSA, RENATO, BRADAMANTE, FRANCO, BRESSAN, Andrea, DALLA TORRE, SILVIA, DUIC, VENICIO, ELIA, CARMINE, GIORGI, MARCELLO, LEVORATO, STEFANO, Makke, Nour, MARTIN, ANNA, PESARO, GIULIA, SBRIZZAI, GIULIO, SCHIAVON, PAOLO, SOZZI, FEDERICA, C., Adolph, M. G., Alekseev, Alexakhin, V. Y. u., Alexandrov, Y. u., G. D., Alexeev, A., Amoroso, A. A., Antonov, A., Austregesilo, B., Badełek, F., Balestra, J., Barth, G., Baum, Y., Bedfer, J., Bernhard, R., Bertini, M., Bettinelli, K., Bicker, J., Bieling, Birsa, Renato, J., Bisplinghoff, P., Bordalo, Bradamante, Franco, C., Braun, A., Bravar, Bressan, Andrea, E., Burtin, D., Chaberny, M., Chiosso, S. U., Chung, A., Cicuttin, M. L., Crespo, DALLA TORRE, Silvia, S., Da, S. S., Dasgupta, Denisov, O. Y. u., L., Dhara, S. V., Donskov, N., Doshita, Duic, Venicio, W., Dünnweber, M., Dziewiecki, A., Efremov, Elia, Carmine, P. D., Eversheim, W., Eyrich, M., Faessler, A., Ferrero, A., Filin, M., Finger, H., Fischer, C., Franco, N., du Fresne von Hohenesche, J. M., Friedrich, R., Garfagnini, F., Gautheron, O. P., Gavrichtchouk, R., Gazda, S., Gerassimov, R., Geyer, Giorgi, Marcello, I., Gnesi, B., Gobbo, S., Goertz, S., Grabmüller, A., Grasso, B., Grube, R., Gushterski, A., Guskov, T., Guthörl, F., Haa, D., von Harrach, S., Hedicke, F. H., Heinsiu, F., Herrmann, C., Heß, F., Hinterberger, N., Horikawa, Höppner, C. h., N., Dʼhose, S., Huber, S., Ishimoto, O., Ivanov, Ivanshin, Y. u., T., Iwata, R., Jahn, P., Jasinski, R., Joosten, E., Kabuß, D., Kang, B., Ketzer, G. V., Khaustov, Khokhlov, Y. u. A., Kisselev, Y. u., F., Klein, K., Klimaszewski, S., Koblitz, J. H., Koivuniemi, V. N., Kolosov, K., Kondo, K., Königsmann, I., Konorov, V. F., Konstantinov, A., Korzenev, A. M., Kotzinian, O., Kouznetsov, M., Krämer, Z. V., Kroumchtein, F., Kunne, K., Kurek, L., Lauser, J. M., Le Goff, A. A., Lednev, A., Lehmann, Levorato, Stefano, J., Lichtenstadt, A., Maggiora, A., Magnon, Makke, Nour, G. K., Mallot, A., Mann, C., Marchand, Martin, Anna, J., Marzec, T., Matsuda, W., Meyer, T., Michigami, Mikhailov, Y. u. V., M. A., Moinester, A., Morreale, A., Mutter, A., Nagaytsev, T., Nagel, J. P., Nassalski, F., Nerling, S., Neubert, D., Neyret, V. I., Nikolaenko, W. D., Nowak, A. S., Nune, A. G., Olshevsky, M., Ostrick, A., Padee, R., Panknin, D., Panzieri, B., Parsamyan, S., Paul, E., Perevalova, Pesaro, Giulia, D. V., Peshekhonov, G., Piragino, S., Platchkov, J., Pochodzalla, J., Polak, V. A., Polyakov, G., Pontecorvo, J., Pretz, S. L., Procureur, M., Quaresma, C., Quintan, J. F., Rajotte, S., Ramo, V., Rapatsky, G., Reicherz, A., Richter, E., Rocco, E., Rondio, N. S., Rossiyskaya, D. I., Ryabchikov, V. D., Samoylenko, A., Sandacz, M. G., Sapozhnikov, S., Sarkar, I. A., Savin, Sbrizzai, Giulio, Schiavon, Paolo, C., Schill, T., Schlüter, K., Schmidt, L., Schmitt, K., Schönning, S., Schopferer, M., Schott, Shevchenko, O. Y. u., L., Silva, L., Sinha, A. N., Sissakian, M., Slunecka, G. I., Smirnov, S., Sosio, Sozzi, Federica, A., Srnka, M., Stolarski, M., Sulc, R., Sulej, P., Sznajder, S., Takekawa, J., Ter Wolbeek, S., Tessaro, F., Tessarotto, L. G., Tkatchev, S., Uhl, I., Uman, M., Vandenbroucke, M., Viriu, N. V., Vlassov, L., Wang, R., Windmolder, W., Wiślicki, H., Wollny, K., Zaremba, M., Zavertyaev, E., Zemlyanichkina, M., Ziembicki, N., Zhuravlev, and A., Zvyagin
Subjects: DEEP-INELASTIC-SCATTERING, COMPASS experiment, semi inclusive deep inelastic scattering, delta g, muon beam, MONTE-CARLO GENERATOR, R=SIGMA-L/SIGMA-T, PROTON, DEUTERON, NEUTRON SPIN STRUCTURE, LEPTON-NUCLEON SCATTERING
Abstract: We present a determination of the gluon polarisation Δg/g in the nucleon, based on the longitudinal double-spin asymmetry of DIS events with Q2>1 (GeV/c)2 including a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam scattering off a polarised View the MathML source target. The gluon polarisation is evaluated by a Neural Network approach for three intervals of the gluon momentum fraction xg covering the range 0.04
Published: 2013

34. The COMPASS Setup for Physics with Hadron Beams

Author: O.P. Gavrichtchouk, Martin Bodlak, K. Schmidt, L. Sinha, T. Matsuda, A. Zink, Norihiro Doshita, S. Gerassimov, N. Horikawa, M.G. Alexeev, Yu. Kisselev, S. Uhl, S. Tessaro, D. Hahne, E. M. Kabuß, Michal Dziewiecki, M. Ostrick, L. Steiger, I.A. Savin, E.R. Bielert, S. Goertz, Yu.A. Khokhlov, Murray Moinester, M. L. Colantoni, C. Braun, B. Badelek, J. Pretz, F. Thibaud, P.D. Eversheim, J. Barth, B. Ketzer, J. Lichtenstadt, F. Tessarotto, C. Adolph, Gerhard K. Mallot, Ch. Höppner, A. Samartsev, M. Virius, Miroslav Sulc, F. Hinterberger, M. Gregori, S. Sarkar, M. Wilfert, Z.V. Kroumchtein, R. Panknin, W.-D. Nowak, B. Grube, H. Suzuki, S. Ramos, S. V. Donskov, T. Weisrock, P. Sznajder, A. Lehmann, R. Joosten, S.-U. Chung, N.S. Rossiyskaya, H. Schmieden, A.S. Nunes, D. von Harrach, S. Platchkov, J.M. Friedrich, N. Kuchinski, D. Panzieri, Janusz Marzec, L. Capozza, C. Quintans, Frank Klein, K. Kondo, R. Hashimoto, A. Srnka, J. Bisplinghoff, S. Grabmüller, T. Grussenmeyer, S. Takekawa, Aram Kotzinian, R. Windmolders, Y. Bedfer, A. Grasso, S. Huber, P. Bordalo, D. Durand, François Herrmann, D.I. Ryabchikov, D. Desforge, R. Kuhn, D.V. Peshekhonov, P. Jasinski, J. Novy, E. Zemlyanichkina, F. Nerling, C. Pires, A.V. Efremov, M. Boer, E. Burtin, V.F. Konstantinov, J. ter Wolbeek, H. Wollny, S. Neubert, T. Szameitat, T. Dafni, Ph. Abbon, K. Kurek, Yu. Ivanshin, V.N. Kolosov, K. Schönning, L. Gatignon, S. Sosio, M. Chiosso, S. Ishimoto, H. Fischer, A. Rychter, R. Birsa, C. Regali, G. Pesaro, F. Haas, R. Geyer, O.Yu. Denisov, M. Gorzellik, F. Kunne, Andrea Ferrero, N. d׳Hose, O.M. Kouznetsov, A. Giganon, M. Krämer, V.I. Nikolaenko, T. Nagel, P. Jörg, G. Menon, M. Ziembicki, I. Gnesi, V. Duic, V. Tskhay, J. Pochodzalla, Q. Curiel, A.M. Dinkelbach, Günter Baum, O.Yu. Shevchenko, S. Levorato, D. Neyret, Jan Matousek, Y. Miyachi, A.A. Lednev, Laura Silva, G. Terca, R.P. Kurjata, R. Beck, F. H. Heinsius, A. Berlin, G.V. Meshcheryakov, V. Andrieux, K. Zaremba, Yu. V. Mikhailov, S. Sirtl, Franco Bradamante, A. Austregesilo, Adam Szabelski, I. Konorov, J.-Y. Rousse, C. Elia, T. Michigami, G.V. Khaustov, P. Schiavon, M. Slunecka, V.A. Polyakov, A.B. Ivanov, V. Pesaro, S.S. Dasgupta, G. Sbrizzai, B. Gobbo, M. Levillain, V. Frolov, Soumen Paul, M. V. Zavertyaev, Q. Weitzel, A. Sandacz, W. Eyrich, A. Amoroso, Nour Makke, J. Bieling, K. Bicker, H. Matsuda, Fabrice Gautheron, N. du Fresne von Hohenesche, T. Schlüter, M. Finger, M. Quaresma, M. A. Faessler, Federica Sozzi, E. Rocco, Matthias Schott, S. Schopferer, M. Büchele, R. Sulej, C. Marchand, J.H. Koivuniemi, A. Nagaytsev, R. Akhunzyanov, F. Balestra, W. Meyer, Maria Liz Crespo, J-M. Reymond, G. D. Alexeev, W. Dünnweber, K. Königsmann, A.G. Olshevsky, A. Magnon, Yu. Alexandrov, V. Jary, Christian Schill, Bakur Parsamyan, A. Maggiora, Alan D. Martin, K. Klimaszewski, C. Franco, Andres Cicuttin, I. Orlov, V.D. Samoylenko, G. Reicherz, S. Dalla Torre, Takahiro Iwata, D. Cotte, Johannes Bernhard, A. Guskov, Andrea Bressan, V. Anosov, Marcin Stolarski, J. Marroncle, I. Uman, P. Ciliberti, L. Wang, S. Dasgupta, R. Jahn, Abbon, P., Adolph, C., Akhunzyanov, R., Alexandrov, Y. u., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badełek, B., Balestra, F., Barth, J., Baum, G, Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bielert, E. R., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, Franco, Braun, C., Bressan, Andrea, Büchele, M., Burtin, E., Capozza, L., Ciliberti, Piero, Chiosso, M., Chung, S. U., Cicuttin, A., Colantoni, M., Cotte, D., Crespo, M. L., Curiel, Q., Dafni, T., DALLA TORRE, Silvia, Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, O. Y. u., Desforge, D., Dinkelbach, A. M., Donskov, S. V., Doshita, N., Duic, V., Dünnweber, W., Durand, D., Dziewiecki, M., Efremov, A., Elia, Carmine, Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., Du Fresne Von Hohenesche, N., Friedrich, J. M., Frolov, V., Gatignon, L., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Giganon, A., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmüller, S., Grasso, A., Gregori, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Von Harrach, D., Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Höppner, C. h., Horikawa, N., D'Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Jörg, P., Joosten, R., Kabuß, E., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Krämer, M., Kroumchtein, Z. V., Kuchinski, N., Kuhn, R., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, Stefano, Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, Nour, Mallot, G. K., Marchand, C., Marroncle, J., Martin, Anna, Marzec, J., Matousek, Jan, Matsuda, H., Matsuda, T., Menon, G., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Miyachi, Y., Moinester, M. A., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. D., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pesaro, Giulia, Pesaro, V., Peshekhonov, D. V., Pires, C., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Reymond, J. M., Rocco, E., Rossiyskaya, N. S., Rousse, J. Y., Ryabchikov, D. I., Rychter, A., Samartsev, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, Giulio, Schiavon, Paolo, Schill, C., Schlüter, T., Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Schott, M., Shevchenko, O. Y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, Federica, Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, Stefano, Terça, G., Wolbeek, J. Ter, Tessaro, S., Tessarotto, F., Thibaud, F., Tskhay, V., Uhl, S., Uman, I., Virius, M., Wang, L., Weisrock, T., Weitzel, Q., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zink, A., Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département d'Ingénierie des Systèmes (ex SIS) (DIS), COMPASS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Particle physics, Calorimetry, Data acquisition and reconstruction, Fixed target experiment for hadron spectroscopy, Front-end electronics, Micro Pattern detectors and Drift chambers, Monte-Carlo simulation, RICH, Instrumentation, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Hadron, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], acquisition and reconstruction, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, Momentum, High Energy Physics - Experiment (hep-ex), Compass, Hadron spectroscopy, 0103 physical sciences, Detectors and Experimental Techniques, 010306 general physics, Physics, Data, Large Hadron Collider, 010308 nuclear & particles physics, MicroMegas detector, Instrumentation and Detectors (physics.ins-det), Micro Pattern detectors, and Drift chambers, Gas electron multiplier, Physics::Accelerator Physics, High Energy Physics::Experiment, Particle Physics - Experiment, Beam (structure), Front-end electronic, Micro Pattern detectors and Drift chamber
Abstract: The main characteristics of the COMPASS experimental setup for physics with hadron beams are described. This setup was designed to perform exclusive measurements of processes with several charged and/or neutral particles in the final state. Making use of a large part of the apparatus that was previously built for spin structure studies with a muon beam, it also features a new target system as well as new or upgraded detectors. The hadron setup is able to operate at the high incident hadron flux available at CERN. It is characterised by large angular and momentum coverages, large and nearly flat acceptances, and good two and three-particle mass resolutions. In 2008 and 2009 it was successfully used with positive and negative hadron beams and with liquid hydrogen and solid nuclear targets. This article describes the new and upgraded detectors and auxiliary equipment, outlines the reconstruction procedures used, and summarises the general performance of the setup., Comment: 91 pages, 101 figures and 7 tables
Published: 2015

35. Constraints on the nucleon strange form factors at Q2∼0.1 GeV2

Author: V. Sulkosky, J. LeRose, M. Mazouz, L. J. Kaufman, R. I. Pomatsalyuk, S. K. Nanda, Yujie Qiang, J. P. Chen, P. Decowski, P. Monaghan, J. Cahoon, B. Craver, F. Garibaldi, G. M. Urciuoli, D. J. Margaziotis, T. Averett, H. Benaoum, H. F. Ibrahim, Bogdan Wojtsekhowski, V. Gorbenko, B. Reitz, J. Roche, Kent Paschke, Seonho Choi, E. Chudakov, William A. Tobias, Peter S. LaViolette, E. Burtin, A. V. Glamazdin, Ronald Gilman, R. Subedi, A. Kolarkar, R. Suleiman, D. Lambert, K. Fuoti, Douglas Higinbotham, D. S. Armstrong, R. Snyder, R. J. Feuerbach, K. McCormick, A. Kelleher, C. W. de Jager, K. Wang, Antonin Vacheret, X. Zheng, K. A. Aniol, Bryan J. Moffit, C. Ferdi, D. Neyret, Jaideep Singh, M. Poelker, F. Cusanno, Nilanga Liyanage, Richard Wilson, Z. E. Meziani, D. G. Meekins, R. Holmes, S. Frullani, S. Kowalski, D. Lhuillier, E. Voutier, J. M. Finn, M. Stutzman, Paul Souder, D. Deepa, G. D. Cates, A. Saha, J. Hansknecht, T. Holmstrom, C. Muñoz-Camacho, R. Michaels, V. Nelyubin, X. Jiang, T. B. Humensky, Y. C. Chao, J. Grames, C. C. Chang, K. S. Kumar, and P.Y. Bertin
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Magnetic moment, Neutral current, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, Form factor (quantum field theory), 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, Neutron, 010306 general physics, Nucleon, Beam energy, media_common
Abstract: We report the most precise measurement to date of a parity-violating asymmetry in elastic electron–proton scattering. The measurement was carried out with a beam energy of 3.03 GeV and a scattering angle 〈 θ lab 〉 = 6.0 ○ , with the result A PV = ( − 1.14 ± 0.24 ( stat ) ± 0.06 ( syst ) ) × 10 −6 . From this we extract, at Q 2 = 0.099 GeV 2 , the strange form factor combination G E s + 0.080 G M s = 0.030 ± 0.025 ( stat ) ± 0.006 ( syst ) ± 0.012 ( FF ) where the first two errors are experimental and the last error is due to the uncertainty in the neutron electromagnetic form factor. This result significantly improves current knowledge of G E s and G M s at Q 2 ∼ 0.1 GeV 2 . A consistent picture emerges when several measurements at about the same Q 2 value are combined: G E s is consistent with zero while positive values are favored for G M s , though G E s = G M s = 0 is compatible with the data at 95% C.L.
Published: 2006

36. Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs

Author: R. Sulej, S. Neliba, P. Berglund, B. Grube, M.G. Sapozhnikov, H. Schmitt, A. Maggiora, E. Rondio, M. Varanda, A. Zvyagin, W. Kastaun, Colin Bernet, A. Srnka, I. Konorov, M.P. Bussa, A. Korzenev, E.S. Ageev, F. H. Heinsius, S. Gerassimov, J. M. Le Goff, T. Toeda, Marc Wagner, P.D. Eversheim, A. Mielech, S. Ishimoto, Frank Klein, K. Kondo, K. Zaremba, M. Wiesmann, J. Reymann, A.A. Shishkin, V. Duic, Sergey Donskov, O.P. Gavrichtchouk, S. Platchkov, P. Rebourgeard, Y. Bedfer, N. Dedek, L. Sinha, F. Balestra, S. Paul, R. Ziegler, V.N. Kolosov, V.A. Polyakov, N.P. Kravchuk, A.K. Konoplyannikov, J. Zhao, R. Jahn, A. Gorin, V. Diaz, M. Maggiora, R. Ijaduola, N. Takabayashi, R. De Masi, P. Bordalo, J. Bisplinghoff, Massimo Lamanna, Yu. Kisselev, A. Amoroso, Vladimir Peshekhonov, R. Birsa, E.V. Komissarov, Andres Cicuttin, J. Lichtenstadt, Norihiro Doshita, G. Piragino, N. d'Hose, Yu.A. Khokhlov, A. Maximov, G. Reicherz, Josef Pochodzalla, I. Ludwig, Naoaki Horikawa, M. Ostrick, Aram Kotzinian, R. Windmolders, A.A. Nozdrin, J. Nassalski, M. Giorgi, R. Bertini, Andrea Ferrero, Oleg V. Ivanov, R. Joosten, S. Dalla Torre, A. N. Sissakian, J.M. Friedrich, V.D. Samoylenko, Yu. Alexandrov, P. Fauland, Christian Schill, C. Marchand, M.E. Ladygin, V.F. Obraztsov, M. Finger, E. Weise, L. Ferrero, D. Kang, M.L. Colantoni, K. Königsmann, S. Hedicke, A. Colavita, S. Horikawa, R. C. Webb, A.M. Dinkelbach, K. Platzer, V.N. Bytchkov, A.V. Dolgopolov, S. Procureur, K. Kowalik, A.B. Sadovski, L. Cerini, V.I. Tretyak, J. Pretz, A. Grünemaier, G.V. Krivokhizhin, O.A. Grajek, N.A. Koutchinski, M. von Hodenberg, A. Sandacz, F. Karstens, U. Wiedner, S. S. Dasgupta, G.V. Khaustov, L. Schmitt, A. Grasso, M. Stolarski, J. Franz, L. G. Tkatchev, F. Stinzing, Grzegorz Brona, Miroslav Sulc, D. Thers, Anna Zanetti, A. Janata, Franco Bradamante, Gerhard K. Mallot, J. Ehlers, F. Kunne, V.V. Tchalishev, N.I. Jouravlev, S. Costa, E. Burtin, V.F. Konstantinov, W. Meyer, Maria Liz Crespo, A.I. Ioukaev, F. Sozzi, R. Hermann, E. M. Kabuß, Paolo Pagano, V.P. Sugonyaev, Q. Weitzel, A.A. Popov, S. Ramos, J.H. Koivuniemi, K. Rith, F. Hinterberger, P. Schiavon, S. Panebianco, H. Fischer, K. Medved, Alan D. Martin, Z.V. Kroumchtein, W. Eyrich, T. Hasegawa, A. Chapiro, Murray Moinester, T. Schmidt, D. Neyret, M. A. Faessler, Alessandro Bressan, D. von Harrach, C. Ilgner, Yu.V. Mikhailov, S. Trousov, J. Marzec, R. Geyer, A.G. Olshevsky, St. Goertz, O.Yu. Denisov, C. Heß, A. Magnon, L. Dhara, M. Slunecka, Takahiro Iwata, E. Saller, S. Koblitz, M. Sans, B. Gobbo, B. Badelek, J. Marroncle, A. Teufel, Miroslav Virius, K. Kurek, A. Padee, B. Ketzer, D. Peshekhonov, W. Wiślicki, H. D. Pereira, N.V. Vlassov, S. Wirth, C. Quintans, J. Hannappel, Günter Baum, O.Yu. Shevchenko, I.A. Savin, A. Bravar, V.I. Nikolaenko, R. Garfagnini, H.-W. Siebert, I. Manuilov, V. Falaleev, D. Panzieri, T. Liška, M. Fabro, M. Leberig, A.M. Rozhdestvensky, N. V. Khomutov, J. Ball, G.I. Smirnov, Fabrice Gautheron, T. Matsuda, V. Frolov, V.Yu. Alexakhin, W. Dünnweber, G. D. Alexeev, V.A. Dorofeev, A.S. Korentchenko, F. Tessarotto, R. Kuhn, O. Nähle, V. Kalinnikov, and A. Skachkova
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Muon, 010308 nuclear & particles physics, Hadron, Deep inelastic scattering, 01 natural sciences, Helicity, Gluon, Nuclear physics, 0103 physical sciences, COMPASS experiment, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: We present a determination of the gluon polarization Δ G / G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q 2 1 ( GeV / c ) 2 , with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarized muon beam scattered on a polarized 6 LiD target. The helicity asymmetry for the selected events is 〈 A ∥ / D 〉 = 0.002 ± 0.019 ( stat ) ± 0.003 ( syst ) . From this value, we obtain in a leading-order QCD analysis Δ G / G = 0.024 ± 0.089 ( stat ) ± 0.057 ( syst ) at x g = 0.095 and μ 2 ≃ 3 ( GeV / c ) 2 .
Published: 2006

37. Exclusive production using COMPASS at CERN

Author: E. Burtin
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Matrix (mathematics), High energy, Range (particle radiation), Particle physics, Large Hadron Collider, Angular distribution, Compass, High Energy Physics::Experiment, Production (computer science), Spin density
Abstract: COMPASS has measured the incoherent exclusive electroproduction of ρ 0 over a wide Q 2 range and at W > = 10 GeV . Spin density matrix elements were extracted from the angular distribution. Preliminary results of the analysis of the data taken in 2002 presented here are consistent with a substantial increase of R = σ L / σ T with Q 2 and a weak violation of SCHC, in agreement with other high energy experiments.
Published: 2005

38. Leading and Next-to-Leading Order Gluon Polarization in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction

Author: C. Adolph, M. G. Alekseev, V. Yu. Alexakhin, Yu. Alexandrov, G. D. Alexeev, A. Amoroso, A. A. Antonov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, Y. Bedfer, A. Berlin, J. Bernhard, R. Bertini, M. Bettinelli, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, P. Bordalo, F. Bradamante, C. Braun, A. Bravar, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S. U. Chung, A. Cicuttin, M. L. Crespo, S. Dalla Torre, S. Das, S. S. Dasgupta, S. Dasgupta, O. Yu. Denisov, L. Dhara, S. V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, H. Fischer, C. Franco, N. du Fresne von Hohenesche, J. M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O. P. Gavrichtchouk, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, S. Grabmüller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, F. H. Heinsius, F. Herrmann, C. Heß, F. Hinterberger, N. Horikawa, Ch. Höppner, N. d’Hose, S. Huber, S. Ishimoto, O. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G. V. Khaustov, Yu. A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J. H. Koivuniemi, V. N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V. F. Konstantinov, A. Korzenev, A. M. Kotzinian, O. Kouznetsov, M. Krämer, Z. V. Kroumchtein, F. Kunne, K. Kurek, L. Lauser, A. A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, T. Liska, A. Maggiora, A. Magnon, N. Makke, G. K. Mallot, A. Mann, C. Marchand, A. Martin, J. Marzec, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu. V. Mikhailov, A. Morreale, A. Mutter, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V. I. Nikolaenko, W.-D. Nowak, A. S. Nunes, A. G. Olshevsky, M. Ostrick, A. Padee, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, E. Perevalova, G. Pesaro, D. V. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V. A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, J.-F. Rajotte, S. Ramos, V. Rapatsky, G. Reicherz, E. Rocco, E. Rondio, N. S. Rossiyskaya, D. I. Ryabchikov, V. D. Samoylenko, A. Sandacz, M. G. Sapozhnikov, S. Sarkar, I. A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, A. Schmidt, K. Schmidt, L. Schmitt, H. Schmïden, K. Schönning, S. Schopferer, M. Schott, O. Yu. Shevchenko, L. Silva, L. Sinha, A. N. Sissakian, M. Slunecka, G. I. Smirnov, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, P. Sznajder, S. Takekawa, J. Ter Wolbeek, S. Tessaro, F. Tessarotto, L. G. Tkatchev, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, N. V. Vlassov, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, N. Zhuravlev, A. Zvyagin, C., Adolph, M. G., Alekseev, Alexakhin, V. Y. u., Alexandrov, Y. u., G. D., Alexeev, A., Amoroso, A. A., Antonov, A., Austregesilo, B., Badełek, F., Balestra, J., Barth, G., Baum, Y., Bedfer, A., Berlin, J., Bernhard, R., Bertini, M., Bettinelli, K., Bicker, J., Bieling, R., Birsa, J., Bisplinghoff, P., Bordalo, Bradamante, Franco, C., Braun, A., Bravar, Bressan, Andrea, M., Büchele, E., Burtin, L., Capozza, M., Chiosso, S. U., Chung, A., Cicuttin, M. L., Crespo, S., Dalla Torre, S., Da, S. S., Dasgupta, S., Dasgupta, Denisov, O. Y. u., L., Dhara, S. V., Donskov, N., Doshita, Duic, Venicio, W., Dünnweber, M., Dziewiecki, A., Efremov, Elia, Carmine, P. D., Eversheim, W., Eyrich, M., Faessler, A., Ferrero, A., Filin, M., Finger, H., Fischer, C., Franco, N., du Fresne von Hohenesche, J. M., Friedrich, V., Frolov, R., Garfagnini, F., Gautheron, O. P., Gavrichtchouk, S., Gerassimov, R., Geyer, M., Giorgi, I., Gnesi, B., Gobbo, S., Goertz, S., Grabmüller, A., Grasso, B., Grube, R., Gushterski, A., Guskov, T., Guthörl, F., Haa, D., von Harrach, F. H., Heinsiu, F., Herrmann, C., Heß, F., Hinterberger, N., Horikawa, Höppner, C. h., N., D’Hose, S., Huber, S., Ishimoto, O., Ivanov, Ivanshin, Y. u., T., Iwata, R., Jahn, V., Jary, P., Jasinski, R., Joosten, E., Kabuß, D., Kang, B., Ketzer, G. V., Khaustov, Khokhlov, Y. u. A., Kisselev, Y. u., F., Klein, K., Klimaszewski, S., Koblitz, J. H., Koivuniemi, V. N., Kolosov, K., Kondo, K., Königsmann, I., Konorov, V. F., Konstantinov, A., Korzenev, A. M., Kotzinian, O., Kouznetsov, M., Krämer, Z. V., Kroumchtein, F., Kunne, K., Kurek, L., Lauser, A. A., Lednev, A., Lehmann, S., Levorato, J., Lichtenstadt, T., Liska, A., Maggiora, A., Magnon, Makke, Nour, G. K., Mallot, A., Mann, C., Marchand, Martin, Anna, J., Marzec, T., Matsuda, G., Meshcheryakov, W., Meyer, T., Michigami, Mikhailov, Y. u. V., A., Morreale, A., Mutter, A., Nagaytsev, T., Nagel, F., Nerling, S., Neubert, D., Neyret, V. I., Nikolaenko, W. D., Nowak, A. S., Nune, A. G., Olshevsky, M., Ostrick, A., Padee, R., Panknin, D., Panzieri, B., Parsamyan, S., Paul, E., Perevalova, Pesaro, Giulia, D. V., Peshekhonov, G., Piragino, S., Platchkov, J., Pochodzalla, J., Polak, V. A., Polyakov, J., Pretz, M., Quaresma, C., Quintan, J. F., Rajotte, S., Ramo, V., Rapatsky, G., Reicherz, E., Rocco, E., Rondio, N. S., Rossiyskaya, D. I., Ryabchikov, V. D., Samoylenko, A., Sandacz, M. G., Sapozhnikov, S., Sarkar, I. A., Savin, Sbrizzai, Giulio, Schiavon, Paolo, C., Schill, T., Schlüter, A., Schmidt, K., Schmidt, L., Schmitt, H., Schmïden, K., Schönning, S., Schopferer, M., Schott, Shevchenko, O. Y. u., L., Silva, L., Sinha, A. N., Sissakian, M., Slunecka, G. I., Smirnov, S., Sosio, Sozzi, Federica, A., Srnka, L., Steiger, M., Stolarski, M., Sulc, R., Sulej, H., Suzuki, P., Sznajder, S., Takekawa, J., Ter Wolbeek, Tessaro, Susanna, F., Tessarotto, L. G., Tkatchev, S., Uhl, I., Uman, M., Vandenbroucke, M., Viriu, N. V., Vlassov, L., Wang, T., Weisrock, M., Wilfert, R., Windmolder, W., Wiślicki, H., Wollny, K., Zaremba, M., Zavertyaev, E., Zemlyanichkina, M., Ziembicki, N., Zhuravlev, and A., Zvyagin
Subjects: Nuclear and High Energy Physics, Particle physics, MONTE-CARLO GENERATOR, Meson, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, SIDIS, DEPENDENT STRUCTURE-FUNCTION, STRUCTURE-FUNCTION G(1)(D), High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, D meson, 010306 general physics, Nuclear Experiment, Physics, Quantum chromodynamics, Muon, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, Polarization (waves), 3. Good health, Gluon, delta G, gluon polarized PDF, High Energy Physics::Experiment, Nucleon, Particle Physics - Experiment
Abstract: The gluon polarisation in the nucleon was measured using open charm production by scattering 160 GeV/c polarised muons off longitudinally polarised protons or deuterons. The data were taken by the COMPASS collaboration between 2002 and 2007. A detailed account is given of the analysis method that includes the application of neural networks. Several decay channels of D^0 mesons are investigated. Longitudinal spin asymmetries of the D meson production cross-sections are extracted in bins of D^0 transverse momentum and energy. At leading order QCD accuracy the average gluon polarisation is determined as (Delta g/G)^LO=-0.06 +/- 0.21 (stat.) +/- 0.08 (syst.) at the scale ~13 (GeV/c)^2 and an average gluon momentum fraction ~ 0.11. For the first time, the average gluon polarisation is also obtained at next-to-leading order QCD accuracy as (Delta g/G)^NLO = -0.13 +/- 0.15 (stat.) +/- 0.15 (syst.) at the scale ~ 13 (\GeV/c)^2 and ~ 0.20., Comment: 35 pages, 13 figures and 13 tables
Published: 2012

39. Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Sivers asymmetries

Author: R. Windmolders, S.U. Chung, L. Schmitt, S. Takekawa, Oleg V. Ivanov, O.P. Gavrichtchouk, P. Jasinski, L. Sinha, T. Matsuda, J. ter Wolbeek, Yu. Alexandrov, G. Baum, Yu. Kisselev, J. Lichtenstadt, S.S. Dasgupta, S. Grabmüller, I. Uman, A. Zvyagin, A. Bressan, M. Ostrick, P.D. Eversheim, H. Suzuki, M.G. Sapozhnikov, E. Rondio, Laura Silva, Bakur Parsamyan, S. Gerassimov, M.G. Alekseev, R. Birsa, N. Horikawa, Sergey Donskov, K. Klimaszewski, A. Srnka, D.V. Peshekhonov, G. Piragino, S. Platchkov, Jean-Francois Rajotte, D.I. Ryabchikov, S. Paul, S. Tessaro, Fabrice Gautheron, Andres Cicuttin, A.S. Nunes, N.V. Vlassov, O.Yu. Shevchenko, S. Levorato, M. A. Faessler, A.G. Olshevsky, J. Pochodzalla, L. Steiger, A. Padee, V. Frolov, K. Zaremba, R. Panknin, G. Pesaro, G. Reicherz, D. Panzieri, S. Ramos, S. Uhl, M. Giorgi, K. Schönning, Alexey Antonov, V.Yu. Alexakhin, Yu.A. Khokhlov, P. Bordalo, D. Kang, N.S. Rossiyskaya, A. Bravar, G.I. Smirnov, S. Dalla Torre, T. Liška, V.A. Polyakov, K. Bicker, D. Neyret, A. Mutter, Michal Dziewiecki, S. Das, Michael Kramer, J. Barth, T. Nagel, J. Pretz, S. Sosio, A. Grasso, I. Gnesi, O.Yu. Denisov, François Herrmann, M. Bettinelli, R. Garfagnini, F. Kunne, R. Jahn, M. Finger, A. Morreale, P. Sznajder, I.A. Savin, Gerhard K. Mallot, G. Sbrizzai, K. Königsmann, C. Hess, S. Koblitz, V. Duic, J.H. Koivuniemi, J. Marzec, A. Korzenev, A.A. Lednev, Yu.V. Mikhailov, A. Lehmann, A. Amoroso, T. Michigami, L. G. Tkatchev, Lei Wang, M. Virius, Matthias Schott, V. Rapatsky, C. Franco, Z.V. Kroumchtein, A. Sandacz, S. Neubert, F. Nerling, A. Maggiora, Sarben Sarkar, A. Richter, F. Tessarotto, N. du Fresne von Hohenesche, E. M. Kabuss, T. Schlüter, E. Rocco, Anne-Laure Martin, J. Polak, M. Stolarski, V.N. Kolosov, Moinester, T. Negrini, I. Konorov, Johannes Bernhard, A. Guskov, W.-D. Nowak, A. Mann, K. Schmidt, T. Iwata, M. V. Zavertyaev, F.H. Heinsius, Christian Schill, W. Eyrich, J.M. Friedrich, Norihiro Doshita, E. Burtin, V.F. Konstantinov, Nour Makke, J. Bieling, C. Adolph, R. Sulej, L. Capozza, K. Kondo, N. d'Hose, J. Bisplinghoff, G. D. Alexeev, A. Nagaytsev, F. Balestra, W. Wislicki, W. Dünnweber, M. Quaresma, A. Magnon, Vladimir Nikolaenko, A. N. Sissakian, Y. Bedfer, Miroslav Sulc, C. Marchand, F. Hinterberger, M. Ziembicki, E. Zemlyanichkina, R. Gushterski, T. Guthörl, A.V. Efremov, Ch. Höppner, F. Haas, R. Geyer, S. Ishimoto, H. Fischer, A. Austregesilo, C. Elia, G.V. Meshcheryakov, L. Dhara, C. Braun, E. Perevalova, B. Badelek, M. Chiosso, R. Joosten, B. Ketzer, A. Filin, K. Kurek, R. Bertini, Andrea Ferrero, Frank Klein, L. Lauser, H. Wollny, Yu. Ivanshin, S. Goertz, B. Grube, M. Slunecka, B. Gobbo, W. Schröder, N. I. Zhuravlev, Federica Sozzi, S. Schopferer, M. Wilfert, C. Quintans, O. Kouznetsov, Franco Bradamante, P. Schiavon, G.V. Khaustov, W. Meyer, Maria Liz Crespo, V. Jary, D. von Harrach, Maxence Vandenbroucke, V.D. Samoylenko, Aram Kotzinian, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Laboratoire de Physique des Composants à Semiconducteurs (LPCS), École Nationale Supérieure d'Électronique et de Radioélectricité de Grenoble (ENSERG)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Università degli studi di Verona = University of Verona (UNIVR), Department of Mathematics [Philadelphia], University of Pennsylvania, National Taiwan University [Taiwan] (NTU), Abdus Salam International Centre for Theoretical Physics [Trieste] (ICTP), Laboratoire d'informatique Fondamentale de Marseille (LIF), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Department of Zoology, Visva-Bharati University, Université Antonine (UA), Institute for Meteorology and Climate Research (IMK), Karlsruhe Institute of Technology (KIT), Laboratoire sur le langage, le cerveau et la cognition (L2C2), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Archeobotanica e Paleoecologia, Università del Salento [Lecce], Physikalisches Institut [Freiburg], Albert-Ludwigs-Universität Freiburg, Institut für Ionenphysik und Angewandte Physik - Institute for Ion Physics and Applied Physics [Innsbruck], Leopold Franzens Universität Innsbruck - University of Innsbruck, Department of Environmental and Materials Engineering, Nagoya Institute, Institute for Computing and Information Sciences [Nijmegen] (ICIS), Radboud University [Nijmegen], Laboratory of Molecular Immunology, Rockefeller University [New York], University of Manchester [Manchester], Université de Caen Normandie (UNICAEN), Normandie Université (NU), Department of Otolaryngology - Head and Neck Surgery, Department of Medecine [Montréal], McGill University = Université McGill [Montréal, Canada]-McGill University = Université McGill [Montréal, Canada], Centre for Research on Brain, Language and Music, International Laboratory for Brain, Music and Sound Research (BRAMS), Princeton University, aucun, Symadrem, Analyse, Géométrie et Modélisation (AGM - UMR 8088), Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Franco-czech Laboratory for clinical research on obesity, Charles University [Prague] (CU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut de Chimie des Substances Naturelles (ICSN), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institute of Environmental Physics [Bremen] (IUP), University of Bremen, University of Cambridge [UK] (CAM), National School of Mountain Sports/National Ski-Nordic Centre, Institut des Biomolécules Max Mousseron [Pôle Chimie Balard] (IBMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre de Mise en Forme des Matériaux (CEMEF), Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Departamento de Matemática e Aplicações (DMA), Universidade do Minho = University of Minho [Braga], Imagerie et modélisation Vasculaires, Thoraciques et Cérébrales (MOTIVATE), Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), COMPASS, Luminescent Materials Laboratory, Department of Biotechnology, University of Verona, University of Pennsylvania [Philadelphia], Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Université Antonine, Université Antonine, Faculté d'ingénieurs, École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Radboud university [Nijmegen], Institut National de la Santé et de la Recherche Médicale (INSERM)-Charles University [Prague] (CU), MINES ParisTech - École nationale supérieure des mines de Paris, Universidade do Minho, Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), C., Adolph, M. G., Alekseev, Alexakhin, V. Y. u., Alexandrov, Y. u., G. D., Alexeev, A., Amoroso, A. A., Antonov, A., Austregesilo, B., Badelek, F., Balestra, J., Barth, G., Baum, Y., Bedfer, J., Bernhard, R., Bertini, M., Bettinelli, K., Bicker, J., Bieling, R., Birsa, J., Bisplinghoff, P., Bordalo, Bradamante, Franco, C., Braun, A., Bravar, Bressan, Andrea, E., Burtin, L., Capozza, M., Chiosso, S. U., Chung, A., Cicuttin, M. L., Crespo, DALLA TORRE, Silvia, S., Da, S. S., Dasgupta, S., Dasgupta, Denisov, O. Y. u., L., Dhara, S. V., Donskov, N., Doshita, Duic, Venicio, W., Duennweber, M., Dziewiecki, A., Efremov, Elia, Carmine, P. D., Eversheim, W., Eyrich, M., Faessler, A., Ferrero, A., Filin, M., Finger, M. Finger j., R., H., Fischer, C., Franco, N., du Fresne von Hohenesche, J. M., Friedrich, V., Frolov, R., Garfagnini, F., Gautheron, O. P., Gavrichtchouk, S., Gerassimov, R., Geyer, Giorgi, Marcello, I., Gnesi, B., Gobbo, S., Goertz, S., Grabmueller, A., Grasso, B., Grube, R., Gushterski, A., Guskov, T., Guthoerl, F., Haa, D., von Harrach, F. H., Heinsiu, F., Herrmann, C., He, F., Hinterberger, N., Horikawa, Hoeppner, C. h., N., D'Hose, S., Ishimoto, O., Ivanov, Ivanshin, Y. u., T., Iwata, R., Jahn, V., Jary, P., Jasinski, R., Joosten, E., Kabu, D., Kang, B., Ketzer, G. V., Khaustov, Khokhlov, Y. u. A., Kisselev, Y. u., F., Klein, K., Klimaszewski, S., Koblitz, J. H., Koivuniemi, V. N., Kolosov, K., Kondo, K., Koenigsmann, I., Konorov, V. F., Konstantinov, A., Korzenev, A. M., Kotzinian, O., Kouznetsov, M., Kraemer, Z. V., Kroumchtein, F., Kunne, K., Kurek, L., Lauser, A. A., Lednev, A., Lehmann, Levorato, Stefano, J., Lichtenstadt, T., Liska, A., Maggiora, A., Magnon, Makke, Nour, G. K., Mallot, A., Mann, C., Marchand, Martin, Anna, J., Marzec, T., Matsuda, G., Meshcheryakov, W., Meyer, T., Michigami, Mikhailov, Y. u. V., M. A., Moinester, A., Morreale, A., Mutter, A., Nagaytsev, T., Nagel, T., Negrini, F., Nerling, S., Neubert, D., Neyret, V. I., Nikolaenko, W. D., Nowak, A. S., Nune, A. G., Olshevsky, M., Ostrick, A., Padee, R., Panknin, D., Panzieri, B., Parsamyan, S., Paul, E., Perevalova, Pesaro, Giulia, D. V., Peshekhonov, G., Piragino, S., Platchkov, J., Pochodzalla, J., Polak, V. A., Polyakov, J., Pretz, M., Quaresma, C., Quintan, J. F., Rajotte, S., Ramo, V., Rapatsky, G., Reicherz, A., Richter, E., Rocco, E., Rondio, N. S., Rossiyskaya, D. I., Ryabchikov, V. D., Samoylenko, A., Sandacz, M. G., Sapozhnikov, S., Sarkar, I. A., Savin, Sbrizzai, Giulio, Schiavon, Paolo, C., Schill, T., Schlueter, K., Schmidt, L., Schmitt, K., Schoenning, S., Schopferer, M., Schott, W., Schroeder, Shevchenko, O. Y. u., L., Silva, L., Sinha, A. N., Sissakian, M., Slunecka, G. I., Smirnov, S., Sosio, Sozzi, Federica, A., Srnka, L., Steiger, M., Stolarski, M., Sulc, R., Sulej, H., Suzuki, P., Sznajder, S., Takekawa, J., Ter Wolbeek, Tessaro, Susanna, F., Tessarotto, L. G., Tkatchev, S., Uhl, I., Uman, M., Vandenbroucke, M., Viriu, N. V., Vlassov, L., Wang, M., Wilfert, R., Windmolder, W., Wislicki, H., Wollny, K., Zaremba, M., Zavertyaev, E., Zemlyanichkina, M., Ziembicki, N., Zhuravlev, and A., Zvyagin
Subjects: Quark, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, Hadron, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Asymmetry, COMPASS, SIDIS, spin asymmetries, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Compass, 0103 physical sciences, 010306 general physics, Nuclear Experiment, media_common, Physics, [PHYS]Physics [physics], Sivers asymmetries, Large Hadron Collider, ta114, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Deep inelastic scattering, Transverse plane, Distribution function, High Energy Physics::Experiment, COMPASS SIDIS TMD Sivers asymmetry, Particle Physics - Experiment
Abstract: The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV positive muon beam and a transversely polarised NH_3 target. The Sivers asymmetry of the proton has been extracted in the Bjorken x range 0.003 0.03. The asymmetry is different from zero and positive also in the low x region, where sea-quarks dominate. The kinematic dependence of the asymmetry has also been investigated and results are given for various intervals of hadron and virtual photon fractional energy. In contrast to the case of the Collins asymmetry, the results on the Sivers asymmetry suggest a strong dependence on the four-momentum transfer to the nucleon, in agreement with the most recent calculations., Comment: 11 pages, 6 figures
Published: 2012

40. Exclusive ρ0 muoproduction on transversely polarised protons and deuterons

Author: C. Adolph, M. G. Alekseev, V. Y.u. Alexakhin, Y.u. Alexandrov, G. D. Alexeev, A. Amoroso, A. A. Antonov, A. Austregesilo, B. Badelek, F. Balestra, J. Barth, G. Baum, Y. Bedfer, J. Bernhard, R. Bertini, M. Bettinelli, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, P. Bordalo, C. Braun, A. Bravar, E. Burtin, L. Capozza, M. Chiosso, S. U. Chung, A. Cicuttin, M. L. Crespo, S. Das, S. S. Dasgupta, S. Dasgupta, O. Y.u. Denisov, L. Dhara, S. V. Donskov, N. Doshita, W. Duennweber, M. Dziewiecki, A. Efremov, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger j.r., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J. M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O. P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, S. Grabmueller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, T. Guthoerl, F. Haas, D. von Harrach, F. H. Heinsius, F. Herrmann, C. Hess, F. Hinterberger, N. Horikawa, C.h. Hoeppner, N. d'Hose, S. Ishimoto, O. Ivanov, Y.u. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, R. Joosten, E. Kabuss, D. Kang, B. Ketzer, G. V. Khaustov, Y.u. A. Khokhlov, Y.u. Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J. H. Koivuniemi, V. N. Kolosov, K. Kondo, K. Koenigsmann, I. Konorov, V. F. Konstantinov, A. Korzenev, A. M. Kotzinian, O. Kouznetsov, M. Kraemer, Z. V. Kroumchtein, F. Kunne, K. Kurek, L. Lauser, A. A. Lednev, A. Lehmann, J. Lichtenstadt, T. Liska, A. Maggiora, A. Magnon, G. K. Mallot, A. Mann, C. Marchand, J. Marzec, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Y.u. V. Mikhailov, M. A. Moinester, A. Morreale, A. Mutter, A. Nagaytsev, T. Nagel, T. Negrini, F. Nerling, S. Neubert, D. Neyret, V. I. Nikolaenko, W. D. Nowak, A. S. Nunes, A. G. Olshevsky, M. Ostrick, A. Padee, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, E. Perevalova, D. V. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V. A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, J. F. Rajotte, S. Ramos, V. Rapatsky, G. Reicherz, A. Richter, E. Rocco, E. Rondio, N. S. Rossiyskaya, D. I. Ryabchikov, V. D. Samoylenko, A. Sandacz, M. G. Sapozhnikov, S. Sarkar, I. A. Savin, C. Schill, T. Schlueter, K. Schmidt, L. Schmitt, K. Schoenning, S. Schopferer, M. Schott, W. Schroeder, O. Y.u. Shevchenko, L. Silva, L. Sinha, A. N. Sissakian, M. Slunecka, G. I. Smirnov, S. Sosio, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, P. Sznajder, S. Takekawa, J. Ter Wolbeek, F. Tessarotto, L. G. Tkatchev, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, N. V. Vlassov, L. Wang, M. Wilfert, R. Windmolders, W. Wislicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, N. Zhuravlev, A. Z.v.y.a.g.i.n., BRADAMANTE, FRANCO, BRESSAN, Andrea, DALLA TORRE, SILVIA, DUIC, VENICIO, ELIA, CARMINE, GIORGI, MARCELLO, LEVORATO, STEFANO, Makke, Nour, MARTIN, ANNA, PESARO, GIULIA, SBRIZZAI, GIULIO, SCHIAVON, PAOLO, SOZZI, FEDERICA, TESSARO, SUSANNA, C., Adolph, M. G., Alekseev, Alexakhin, V. Y. u., Alexandrov, Y. u., G. D., Alexeev, A., Amoroso, A. A., Antonov, A., Austregesilo, B., Badelek, F., Balestra, J., Barth, G., Baum, Y., Bedfer, J., Bernhard, R., Bertini, M., Bettinelli, K., Bicker, J., Bieling, R., Birsa, J., Bisplinghoff, P., Bordalo, Bradamante, Franco, C., Braun, A., Bravar, Bressan, Andrea, E., Burtin, L., Capozza, M., Chiosso, S. U., Chung, A., Cicuttin, M. L., Crespo, DALLA TORRE, Silvia, S., Da, S. S., Dasgupta, S., Dasgupta, Denisov, O. Y. u., L., Dhara, S. V., Donskov, N., Doshita, Duic, Venicio, W., Duennweber, M., Dziewiecki, A., Efremov, Elia, Carmine, P. D., Eversheim, W., Eyrich, M., Faessler, A., Ferrero, A., Filin, M., Finger, M. Finger j., R., H., Fischer, C., Franco, N., du Fresne von Hohenesche, J. M., Friedrich, V., Frolov, R., Garfagnini, F., Gautheron, O. P., Gavrichtchouk, S., Gerassimov, R., Geyer, Giorgi, Marcello, I., Gnesi, B., Gobbo, S., Goertz, S., Grabmueller, A., Grasso, B., Grube, R., Gushterski, A., Guskov, T., Guthoerl, F., Haa, D., von Harrach, F. H., Heinsiu, F., Herrmann, C., He, F., Hinterberger, N., Horikawa, Hoeppner, C. h., N., D'Hose, S., Ishimoto, O., Ivanov, Ivanshin, Y. u., T., Iwata, R., Jahn, V., Jary, P., Jasinski, R., Joosten, E., Kabu, D., Kang, B., Ketzer, G. V., Khaustov, Khokhlov, Y. u. A., Kisselev, Y. u., F., Klein, K., Klimaszewski, S., Koblitz, J. H., Koivuniemi, V. N., Kolosov, K., Kondo, K., Koenigsmann, I., Konorov, V. F., Konstantinov, A., Korzenev, A. M., Kotzinian, O., Kouznetsov, M., Kraemer, Z. V., Kroumchtein, F., Kunne, K., Kurek, L., Lauser, A. A., Lednev, A., Lehmann, Levorato, Stefano, J., Lichtenstadt, T., Liska, A., Maggiora, A., Magnon, Makke, Nour, G. K., Mallot, A., Mann, C., Marchand, Martin, Anna, J., Marzec, T., Matsuda, G., Meshcheryakov, W., Meyer, T., Michigami, Mikhailov, Y. u. V., M. A., Moinester, A., Morreale, A., Mutter, A., Nagaytsev, T., Nagel, T., Negrini, F., Nerling, S., Neubert, D., Neyret, V. I., Nikolaenko, W. D., Nowak, A. S., Nune, A. G., Olshevsky, M., Ostrick, A., Padee, R., Panknin, D., Panzieri, B., Parsamyan, S., Paul, E., Perevalova, Pesaro, Giulia, D. V., Peshekhonov, G., Piragino, S., Platchkov, J., Pochodzalla, J., Polak, V. A., Polyakov, J., Pretz, M., Quaresma, C., Quintan, J. F., Rajotte, S., Ramo, V., Rapatsky, G., Reicherz, A., Richter, E., Rocco, E., Rondio, N. S., Rossiyskaya, D. I., Ryabchikov, V. D., Samoylenko, A., Sandacz, M. G., Sapozhnikov, S., Sarkar, I. A., Savin, Sbrizzai, Giulio, Schiavon, Paolo, C., Schill, T., Schlueter, K., Schmidt, L., Schmitt, K., Schoenning, S., Schopferer, M., Schott, W., Schroeder, Shevchenko, O. Y. u., L., Silva, L., Sinha, A. N., Sissakian, M., Slunecka, G. I., Smirnov, S., Sosio, Sozzi, Federica, A., Srnka, L., Steiger, M., Stolarski, M., Sulc, R., Sulej, H., Suzuki, P., Sznajder, S., Takekawa, J., Ter Wolbeek, Tessaro, Susanna, F., Tessarotto, L. G., Tkatchev, S., Uhl, I., Uman, M., Vandenbroucke, M., Viriu, N. V., Vlassov, L., Wang, M., Wilfert, R., Windmolder, W., Wislicki, H., Wollny, K., Zaremba, M., Zavertyaev, E., Zemlyanichkina, M., Ziembicki, N., Zhuravlev, and A. Z. v. y. a. g. i., N.
Subjects: COMPASS GPD DVMP Transverse asymmetry
Abstract: The transverse target spin azimuthal asymmetry View the MathML source in hard exclusive production of ρ0 mesons was measured at COMPASS by scattering 160 GeV/c muons off transversely polarised protons and deuterons. The measured asymmetry is sensitive to the nucleon helicity-flip generalised parton distributions Eq, which are related to the orbital angular momentum of quarks in the nucleon. The Q2, xBj and View the MathML source dependence of View the MathML source is presented in a wide kinematic range: View the MathML source, 0.003
Published: 2012

41. D* and D Meson Production in Muon Nucleon Interactions at 160 GeV/c

Author: C. Adolph, M. G. Alekseev, V. Yu. Alexakhin, Yu. Alexandrov, G. D. Alexeev, A. Amoroso, A. A. Antonov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, Y. Bedfer, A. Berlin, J. Bernhard, R. Bertini, M. Bettinelli, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, P. Bordalo, F. Bradamante, C. Braun, A. Bravar, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S. U. Chung, A. Cicuttin, M. L. Crespo, S. Dalla Torre, S. Das, S. S. Dasgupta, S. Dasgupta, O. Yu. Denisov, L. Dhara, S. V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, H. Fischer, C. Franco, N. du Fresne von Hohenesche, J. M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O. P. Gavrichtchouk, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, S. Grabmüller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, F. H. Heinsius, F. Herrmann, C. Heß, F. Hinterberger, N. Horikawa, Ch. Höppner, N. d’Hose, S. Huber, S. Ishimoto, O. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G. V. Khaustov, Yu. A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J. H. Koivuniemi, V. N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V. F. Konstantinov, A. Korzenev, A. M. Kotzinian, O. Kouznetsov, M. Krämer, Z. V. Kroumchtein, F. Kunne, K. Kurek, L. Lauser, A. A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, T. Liska, A. Maggiora, A. Magnon, N. Makke, G. K. Mallot, A. Mann, C. Marchand, A. Martin, J. Marzec, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu. V. Mikhailov, A. Morreale, A. Mutter, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V. I. Nikolaenko, W.-D. Nowak, A. S. Nunes, A. G. Olshevsky, M. Ostrick, A. Padee, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, E. Perevalova, G. Pesaro, D. V. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V. A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, J.-F. Rajotte, S. Ramos, V. Rapatsky, G. Reicherz, E. Rocco, E. Rondio, N. S. Rossiyskaya, D. I. Ryabchikov, V. D. Samoylenko, A. Sandacz, M. G. Sapozhnikov, S. Sarkar, I. A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, A. Schmidt, K. Schmidt, L. Schmitt, H. Schmïden, K. Schönning, S. Schopferer, M. Schott, O. Yu. Shevchenko, L. Silva, L. Sinha, A. N. Sissakian, M. Slunecka, G. I. Smirnov, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, P. Sznajder, S. Takekawa, J. Ter Wolbeek, S. Tessaro, F. Tessarotto, L. G. Tkatchev, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, N. V. Vlassov, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, N. Zhuravlev, A. Zvyagin, C., Adolph, M. G., Alekseev, Alexakhin, V. Y. u., Alexandrov, Y. u., G. D., Alexeev, A., Amoroso, A. A., Antonov, A., Austregesilo, B., Badełek, F., Balestra, J., Barth, G., Baum, Y., Bedfer, A., Berlin, J., Bernhard, R., Bertini, M., Bettinelli, K., Bicker, J., Bieling, Birsa, Renato, J., Bisplinghoff, P., Bordalo, Bradamante, Franco, C., Braun, A., Bravar, Bressan, Andrea, M., Büchele, E., Burtin, L., Capozza, M., Chiosso, S. U., Chung, A., Cicuttin, M. L., Crespo, S., Dalla torre, S., Da, S. S., Dasgupta, S., Dasgupta, Denisov, O. Y. u., L., Dhara, S. V., Donskov, N., Doshita, Duic, Venicio, W., Dünnweber, M., Dziewiecki, A., Efremov, Elia, Carmine, P. D., Eversheim, W., Eyrich, M., Faessler, A., Ferrero, A., Filin, M., Finger, H., Fischer, C., Franco, N., Du fresne von hohenesche, J. M., Friedrich, V., Frolov, R., Garfagnini, F., Gautheron, O. P., Gavrichtchouk, S., Gerassimov, R., Geyer, Giorgi, Marcello, I., Gnesi, B., Gobbo, S., Goertz, S., Grabmüller, A., Grasso, B., Grube, R., Gushterski, A., Guskov, T., Guthörl, F., Haa, D., Harrach, F. H., Heinsiu, F., Herrmann, C., Heß, F., Hinterberger, N., Horikawa, Höppner, C. h., N., D’Hose, S., Huber, S., Ishimoto, O., Ivanov, Ivanshin, Y. u., T., Iwata, R., Jahn, V., Jary, P., Jasinski, R., Joosten, E., Kabuß, D., Kang, B., Ketzer, G. V., Khaustov, Khokhlov, Y. u. A., Kisselev, Y. u., F., Klein, K., Klimaszewski, S., Koblitz, J. H., Koivuniemi, V. N., Kolosov, K., Kondo, K., Königsmann, I., Konorov, V. F., Konstantinov, A., Korzenev, A. M., Kotzinian, O., Kouznetsov, M., Krämer, Z. V., Kroumchtein, F., Kunne, K., Kurek, L., Lauser, A. A., Lednev, A., Lehmann, Levorato, Stefano, J., Lichtenstadt, T., Liska, A., Maggiora, A., Magnon, Makke, Nour, G. K., Mallot, A., Mann, C., Marchand, Martin, Anna, J., Marzec, T., Matsuda, G., Meshcheryakov, W., Meyer, T., Michigami, Mikhailov, Y. u. V., A., Morreale, A., Mutter, A., Nagaytsev, T., Nagel, F., Nerling, S., Neubert, D., Neyret, V. I., Nikolaenko, W. D., Nowak, A. S., Nune, A. G., Olshevsky, M., Ostrick, A., Padee, R., Panknin, D., Panzieri, B., Parsamyan, S., Paul, E., Perevalova, Pesaro, Giulia, D. V., Peshekhonov, G., Piragino, S., Platchkov, J., Pochodzalla, J., Polak, V. A., Polyakov, J., Pretz, M., Quaresma, C., Quintan, J. F., Rajotte, S., Ramo, V., Rapatsky, G., Reicherz, E., Rocco, E., Rondio, N. S., Rossiyskaya, D. I., Ryabchikov, V. D., Samoylenko, A., Sandacz, M. G., Sapozhnikov, S., Sarkar, I. A., Savin, Sbrizzai, Giulio, Schiavon, Paolo, C., Schill, T., Schlüter, A., Schmidt, K., Schmidt, L., Schmitt, H., Schmïden, K., Schönning, S., Schopferer, M., Schott, Shevchenko, O. Y. u., L., Silva, L., Sinha, A. N., Sissakian, M., Slunecka, G. I., Smirnov, S., Sosio, Sozzi, Federica, A., Srnka, L., Steiger, M., Stolarski, M., Sulc, R., Sulej, H., Suzuki, P., Sznajder, S., Takekawa, J., Ter wolbeek, S., Tessaro, F., Tessarotto, L. G., Tkatchev, S., Uhl, I., Uman, M., Vandenbroucke, M., Viriu, N. V., Vlassov, L., Wang, T., Weisrock, M., Wilfert, R., Windmolder, W., Wiślicki, H., Wollny, K., Zaremba, M., Zavertyaev, E., Zemlyanichkina, M., Ziembicki, N., Zhuravlev, and A., Zvyagin
Subjects: cross-section, Particle physics, COLLISIONS, MONTE-CARLO GENERATOR, Meson, Charmed meson, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Inelastic scattering, Charmed mesons, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, CHARM PHOTOPRODUCTION, High Energy Physics - Experiment (hep-ex), ASYMMETRIES, Compass, 0103 physical sciences, D meson, SCATTERING, PRODUCTION CROSS-SECTION, QCD CORRECTIONS, HEAVY QUARKS, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Physics, Large Hadron Collider, Muon, Spectrometer, 010308 nuclear & particles physics, Compass Experiment, Physics::Accelerator Physics, High Energy Physics::Experiment, Nucleon, Particle Physics - Experiment
Abstract: The production of D* and D mesons in inelastic scattering of 160 GeV/c muons off a ^6LiD target has been investigated with the COMPASS spectrometer at CERN for 0.003 (GeV/c)^2 < Q^2 < 10 (GeV/c)^2 and 3x10^-5< x_Bj < 0.1. The study is based on 8100 events where a D^0 or anti D^0 is detected subsequently to a D*+ or D*- decay, and on 34000 events, where only a D^0 or anti D^0 is detected. Kinematic distributions of D*, D and K*_2 are given as a function of their energy E, transverse momentum p_T, energy fraction z, and of the virtual photon variables nu, Q^2 and x_Bj. Semi-inclusive differential D* production cross-sections are compared with theoretical predictions for D* production via photon-gluon fusion into open charm. The total observed production cross-section for D*+/- mesons with laboratory energies between 22 and 86 GeV is 1.9 nb. Significant cross-section asymmetries are observed between D*+ and D*- production for nu0.6., 22 pages, 12 figures and 2 tables
Published: 2012
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42. Measurement of the polarisation of a high energy muon beam

Author: Shafqat Ahmad, E. Burtin, B. Frois, M. Grosse Perdekamp, R. Seitz, S. Dhawan, Drew Parks, I. Savin, M. Litmaath, M. D. Corcoran, B. Adeva, R.E. Segel, Alan D. Martin, John C. Mitchell, K. P. Schüler, J. Cranshaw, Günter Baum, T. Pussieux, Per Berglund, A. Rijllart, H. J. Kessler, Alessandro Bressan, M. Plo, G. Perez, D. von Harrach, T. Gaussiran, Roland Windmolders, Naoaki Horikawa, B. E. Bonner, M. Rodriguez, A. Arvidson, Kwong Lau, F. Marie, J. Pyrlik, C. A. Whitten, J. C. Faivre, Gerhard K. Mallot, W. Tlaczala, E. von Goeler, M. Clocchiatti, F. Lehar, D. Sanders, I. Sabo, D. Fasching, G. Igo, J.A. Buchanan, J. M. Rieubland, M. K. Ballintijn, David Miller, T. Lindqvist, Rudiger Voss, J. H. Moromisato, A. Rosado, S. Trentalange, S. Bültmann, Aldo Penzo, J. A. Garzon, Shoji Okumi, R. Kaiser, G. Bardin, A. Witzmann, Franco Bradamante, J. E.J. Oberski, S. Ishimoto, J. Martino, A. Dyring, G. van Middelkoop, V. G. Krivokhijine, J. Nassalski, B. Badelek, Sergey M. Sergeev, W. Thiel, A. Brüll, Yu. Kisselev, J. Dupont, U. Landgrat, C. Fernandez, A. Karev, G. Gracia, F. Feinstein, A. Sandacz, N. Hayashi, P. Schiavon, S. Dalla Torre, M. Velasco, R. van Dantzig, F. Perrot-Kunne, Wojciech Wislicki, S. Eichblatt, T. Hasegawa, Anna Zanetti, M. Boutemeur, G.S. Mutchler, L. Ropelewski, S. Lopez-Ponte, A. de Lesquen, H. Stuhrmann, C. A. Heusch, C. Dulya, Andrés Gómez, I. G. Bird, L. Klostermann, T. Çuhadar, A. Kishi, Ricardo Piegaia, M. Giorgi, J. Lichtenstadt, K. M. Teichert, M. de Jong, E. Rondio, T. Layda, A. Staude, J. Kyynäräinen, Jay Roberts, D. Pose, Y. Tzamouranis, J. M. Demolis, Lawrence Pinsky, Donald Crabb, Tjeerd Ketel, V. W. Hughes, Takahiro Iwata, J. S. McCarthy, P. Björkholm, F. Tessarotto, C. Cavata, S. Platchkov, P. Shanahan, Kunikazu Mori, L. Naumann, Roy Weinstein, G. Smirnov, L. Betev, K. Zaremba, E. M. Kabuss, C. Garabatos, R. Birsa, A. Magnon, J.M. Clement, B. W. Mayes, J. Saborido, J. Vogt, N. de Botton, Victor Kukhtin, M. Lamanna, D.V. Peshekhonov, M. Lowe, J. P. Chen, L. Gatignon, Donal Day, Jinkui Zhao, Aina Yañez, F. Sever, T. O. Niinikoski, H. Postma, A. Steinmetz, B., Adeva, S., Ahmad, A., Arvidson, B., Badelek, M. K., Ballintijn, G., Bardin, G., Baum, P., Berglund, L., Betev, I. G., Bird, Birsa, Renato, P., Björkholm, B. E., Bonner, N., de Botton, M., Boutemeur, Bradamante, Franco, Bressan, Andrea, A., Brüll, J., Buchanan, S., Bültmann, E., Burtin, C., Cavata, J. P., Chen, J., Clement, M., Clocchiatti, M. D., Corcoran, D., Crabb, J., Cranshaw, T., Çuhadar, DALLA TORRE, Silvia, R., van Dantzig, D., Day, J. M., Demoli, S., Dhawan, C., Dulya, J., Dupont, A., Dyring, S., Eichblatt, J. C., Faivre, D., Fasching, F., Feinstein, C., Fernandez, B., Froi, C., Garabato, J. A., Garzon, L., Gatignon, T., Gaussiran, Giorgi, Marcello, E., von Goeler, A., Gomez, G., Gracia, M., Grosse Perdekamp, D., von Harrach, T., Hasegawa, N., Hayashi, C. A., Heusch, N., Horikawa, V. W., Hughe, G., Igo, S., Ishimoto, T., Iwata, M., de Jong, E. M., Kabu, R., Kaiser, A., Karev, H. J., Kessler, T. J., Ketel, A., Kishi, Kisselev, Y. u., L., Klostermann, V., Krivokhijine, V., Kukhtin, J., Kyynäräinen, M., Lamanna, U., Landgrat, K., Lau, T., Layda, F., Lehar, A., de Lesquen, J., Lichtenstadt, T., Lindqvist, M., Litmaath, S., Lopez Ponte, M., Lowe, A., Magnon, G. K., Mallot, F., Marie, Martin, Anna, J., Martino, B., Maye, J. S., Mccarthy, G., van Middelkoop, D., Miller, J., Mitchell, K., Mori, J., Moromisato, G. S., Mutchler, J., Nassalski, L., Naumann, T. O., Niinikoski, J. E. J., Oberski, S., Okumi, D. P., Park, A., Penzo, G., Perez, F., Perrot Kunne, D., Peshekhonov, R., Piegaia, L., Pinsky, S., Platchkov, M., Plo, D., Pose, H., Postma, T., Pussieux, J., Pyrlik, J. M., Rieubland, A., Rijllart, J. B., Robert, M., Rodriguez, E., Rondio, L., Ropelewski, A., Rosado, I., Sabo, J., Saborido, A., Sandacz, D., Sander, I., Savin, Schiavon, Paolo, K. P., Schüler, R., Segel, R., Seitz, S., Sergeev, F., Sever, P., Shanahan, G., Smirnov, A., Staude, A., Steinmetz, H., Stuhrmann, W., Tlaczala, K. M., Teichert, F., Tessarotto, W., Thiel, S., Trentalange, Y., Tzamourani, M., Velasco, J., Vogt, R., Vo, R., Weinstein, C., Whitten, R., Windmolder, W., Wislicki, A., Witzmann, A., Yañez, Zanetti, ANNA MARIA, K., Zaremba, and J., Zhao
Subjects: Physics, Nuclear and High Energy Physics, Large Hadron Collider, Muon, Physics::Instrumentation and Detectors, Polarimeter, positron energy spectrum, muon beam polarimeter, Nuclear physics, Positron, Energy spectrum, Physics::Accelerator Physics, High Energy Physics::Experiment, Detectors and Experimental Techniques, Nuclear Experiment, Instrumentation, Energy (signal processing), Beam (structure)
Abstract: A muon beam polarimeter has been built for the SMC experiment at the CERN SPS, for muon energies of 100 to 200 GeV. The beam polarisation is determined from the energy spectrum of positrons from the decay μ+ → e+ νcνμ. A polarisation of - 0.82 is measured with a relative systematic accuracy of 3%.
Published: 1994

43. Feasibility study of deeply virtual compton scattering using COMPASS at CERN

Author: N. d'Hose, E. Burtin, J. Marroncle, and P.A.M. Guichon
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Upgrade, Muon, Large Hadron Collider, Compass, Hadron, Compton scattering, Parton, Beam (structure)
Abstract: This paper presents the reactions which can be performed at COMPASS to study the Generalized Parton Distributions (GPDs). The high energy muon beam at CERN allows to measure Hard Exclusive Meson Production or Deeply Virtual Compton Scattering (DVCS) in the Bjorken regime in a large range of Q 2 and x Bj (1.5 ≤ Q 2≤ 7.5 GeV2 and 0.03 ≤ x Bj ≤ 0.25). Exploratory measurements dedicated to ρ ° or π° production can be investigated with the present setup. DVCS measurement require an upgrade of the COMPASS setup
Published: 2004

44. Deeply virtual compton scattering using COMPASS at CERN

Author: J. Marroncle, N. d'Hose, P.A.M. Guichon, and E. Burtin
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Large Hadron Collider, media_common.quotation_subject, Compton scattering, Charge (physics), Asymmetry, Nuclear physics, Cross section (physics), Compass, Physics::Accelerator Physics, High Energy Physics::Experiment, Beam (structure), media_common
Abstract: In this paper, we present the recent studies our group has conducted in order to show the feasibility of a Deeply Virtual Compton Scattering experiment using COMPASS and its high energy muon beam at CERN. The measurement of the cross section and the beam charge asymmetry in the kinematical domain: 0.03
Published: 2003

45. Feasibility study of deeply virtual Compton scattering using COMPASS

Author: E. Burtin, S. Kerhoas-Cavata, P.A.M. Guichon, N. d'Hose, L. Mosse, and J. Marroncle
Subjects: Physics, Nuclear and High Energy Physics, Optics, business.industry, Compass, Compton scattering, business
Published: 2002

46. Cryogenic Silicon Detectors for the COMPASS Experiment at CERN

Author: K. Bicker, Soumen Paul, H. Angerer, A. Magnon, Stefanie Grabmüller, N. dʼHose, J.-Y. Rousse, E. Burtin, P. Zimmerer, F. Gautheron, I. Konorov, J.M. Friedrich, and B. Ketzer
Subjects: Physics, Nuclear and High Energy Physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Detector, Tracking (particle physics), Atomic and Molecular Physics, and Optics, Particle detector, Semiconductor detector, Nuclear physics, Measuring instrument, COMPASS experiment, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Beam (structure)
Abstract: In 2002 the COMPASS experiment at CERN has started to take physics data. The fixed target experiment at the SPS uses muon and hadron beams of very high intensity to investigate the structure of the nucleon. For beam definition and small angle tracking silicon microstrip detectors are used. This article describes the current design and the performance of the cryogenic cooling system of these detectors as well as the further development which is underway.
Published: 2011

47. Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons

Author: R. Sulej, K. Zaremba, J. Lichtenstadt, Andres Cicuttin, I. Orlov, M. Stolarski, N. Doshita, G. Sbrizzai, L. Steiger, S. Dalla Torre, Q. Curiel, G.D. Alexeev, D. Neyret, S. Huber, A. Amoroso, S.-U. Chung, V.A. Polyakov, J. Polak, A. Srnka, R. Jahn, A. Ferrero, N. du Fresne von Hohenesche, E. Rocco, M. Wilfert, A. Grasso, R. Joosten, H. Wollny, S. Platchkov, V. Anosov, K. Klimaszewski, O.P. Gavrichtchouk, D. Hahne, E. M. Kabuß, I. Uman, L. Sinha, B. Badełek, V. Jary, M. Finger, J. Bieling, O.Yu. Denisov, Z. Kral, V. Andrieux, O.M. Kouznetsov, Christian Schill, D.I. Ryabchikov, T. Matsuda, M. Ziembicki, S. Ramos, J. Bisplinghoff, K. Kurek, M. Ostrick, Franco Bradamante, S. Paul, D.V. Peshekhonov, P.D. Eversheim, G. Piragino, Z.V. Kroumchtein, C. Braun, A. Maggiora, R. Birsa, F. Hinterberger, P. Schiavon, N. Horikawa, A. Austregesilo, R. Bertini, F. Haas, P. Sznajder, M.G. Alexeev, A. Berlin, M. Slunecka, M. Krämer, W. Meyer, Maria Liz Crespo, F. Herrmann, F. Balestra, G. Reicherz, M. Giorgi, H. Matsuda, J. Marzec, Johannes Bernhard, C. Elia, G.V. Khaustov, F. Nerling, B. Grube, J. Pochodzalla, V. Frolov, A. Efremov, W. Wiślicki, B. Gobbo, N.S. Rossiyskaya, Lei Wang, S. Dasgupta, T. Guthörl, Yu. Kisselev, V. K. Rodionov, J. Matousek, G.K. Mallot, J. Pretz, A. Sandacz, I. Gnesi, J. Barth, S. Gerassimov, V.D. Samoylenko, W.-D. Nowak, C. Franco, S.V. Donskov, S. Neubert, F.H. Heinsius, L. Silva, K. Kondo, P. Jasinski, L. Capozza, Y. Miyachi, Andrea Bressan, A.A. Lednev, B. Ketzer, C. Marchand, R. Akhunzyanov, Ch. Höppner, S. Schopferer, C. Adolph, M. Dziewiecki, P. Joerg, W. Eyrich, A.G. Olshevsky, T. Michigami, M. Schott, V.F. Konstantinov, A.M. Kotzinian, A.B. Ivanov, E. Zemlyanichkina, N. Makke, K. Bicker, A. Guskov, M. Bodlak, I.A. Savin, T. Schlüter, M. Virius, Günter Baum, O.Yu. Shevchenko, S. Levorato, Alan D. Martin, R. Hashimoto, M. Gorzellik, R.P. Kurjata, M. Sulc, J. Vondra, Yu.A. Khokhlov, A. Szableski, F. Gautheron, H. Fischer, A. Rychter, Y. Bedfer, F. Kunne, W. Dünnweber, S. Tessaro, R. Geyer, R. Panknin, S. Uhl, F. Thibaud, M. Chiosso, R. Garfagnini, K. Schmidt, S. Grabmüller, J. Novy, Yu. Alexandrov, Takahiro Iwata, M. Büchele, A. Schmidt, Bakur Parsamyan, S. Takekawa, F. Sozzi, K. Königsmann, T. Weisrock, M. V. Zavertyaev, M. A. Faessler, C. Quintans, A. Lehmann, J.H. Koivuniemi, R. Windmolders, D. von Harrach, T. Nagel, A. Nagaytsev, S. Goertz, J. ter Wolbeek, M. Quaresma, Maxence Vandenbroucke, Yu. Ivanshin, S.S. Dasgupta, I. Konorov, F. Klein, G.V. Meshcheryakov, S. Sirtl, F. Tessarotto, E. Burtin, V. Duic, P. Bordalo, D. Kang, K. Schönning, V.N. Kolosov, A. Bravar, E. Rondio, S. Ishimoto, H. Schmieden, M. Boer, N. Kuchinski, J.M. Friedrich, Vladimir Nikolaenko, Yu.V. Mikhailov, R. Beck, S. Sosio, A. Magnon, H. Suzuki, A. Filin, S. Sarkar, N. d'Hose, M. Pešek, A.S. Nunes, D. Panzieri, T. Szameitat, Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexandrov, Y. u., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badełek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bertini, R., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, Franco, Braun, C., Bravar, A., Bressan, Andrea, Büchele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., DALLA TORRE, Silvia, Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, O. Y. u., Donskov, S. V., Doshita, N., Duic, Venicio, Dünnweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Garfagnini, R., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Giorgi, M., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmüller, S., Grasso, A., Grube, B., Guskov, A., Guthörl, T., Haas, F., von Harrach, D., Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Höppner, C. h., Horikawa, N., D'Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joerg, P., Joosten, R., Kabuß, E., Kang, D., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kral, Z., Krämer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levorato, Stefano, Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, Nour, Mallot, G. K., Marchand, C., Martin, Anna, Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. D., Nunes, A. S., Orlov, I., Olshevsky, A. G., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pesek, M., Peshekhonov, D., Piragino, G., Platchkov, S., Pochodzalla, J., Polak, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Reicherz, G., Rocco, E., Rodionov, V., Rondio, E., Rychter, A., Rossiyskaya, N. S., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, Paolo, Schill, C., Schlüter, T., Schmidt, A., Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Schott, M., Shevchenko, O. Y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, Federica, Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szableski, A., Szameitat, T., Sznajder, P., Takekawa, Stefano, ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Vandenbroucke, M., Virius, M., Vondra, J., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wiślicki, W., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., and Ziembicki, M.
Subjects: Particle physics, Nuclear and High Energy Physics, TMD, SIDIS, PDF, Hadron, FOS: Physical sciences, SIVERS ASYMMETRIES, MUON PROTON-SCATTERING, COLLINS, SIDIS, PDF, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), LEPTOPRODUCTION, DEPENDENCE, 0103 physical sciences, DISTRIBUTIONS, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Nuclear Experiment, Physics, Large Hadron Collider, Muon, 010308 nuclear & particles physics, TMD, ELECTROPRODUCTION, Deep inelastic scattering, Azimuth, Amplitude, SPIN ASYMMETRIES, lcsh:QC770-798, High Energy Physics::Experiment, Nucleon, Particle Physics - Experiment, Beam (structure)
Abstract: Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS muon beam at $160$ GeV/c and a $^6$LiD target. The amplitudes of the three azimuthal modulations $\cos\phi_h$, $\cos2\phi_h$ and $\sin\phi_h$ were obtained binning the data separately in each of the relevant kinematic variables $x$, $z$ or $p_T^{\,h}$ and binning in a three-dimensional grid of these three variables. The amplitudes of the $\cos \phi_h$ and $\cos 2\phi_h$ modulations show strong kinematic dependencies both for positive and negative hadrons., Comment: 33 pages, 15 figures and 10 pages
Published: 2014

48. Spin alignment and violation of the OZI rule in exclusive ω and ϕ production in pp collisions

Author: S. Neubert, M. Schott, K. Kondo, P. Jasinski, M. Gorzellik, A.B. Ivanov, A. Magnon, K. Schönning, T. Schlüter, B. Badełek, D.I. Ryabchikov, O.Yu. Denisov, L. Capozza, M. Ziembicki, S. Paul, Alan D. Martin, V. Andrieux, V.N. Kolosov, Ch. Höppner, A. Berlin, R. Jahn, A. Ferrero, C. Elia, G.V. Khaustov, Y. Bedfer, Lei Wang, J. Lichtenstadt, F. Kunne, A. Efremov, W. Dünnweber, A.M. Kotzinian, Q. Curiel, G. Sbrizzai, A. Srnka, Y. Miyachi, R. Geyer, M. Chiosso, E. Burtin, V. Duic, F. Hinterberger, P. Schiavon, W.-D. Nowak, I.A. Savin, S. Ishimoto, J. Pretz, M. Ostrick, I. Uman, S. Gerassimov, P. Bordalo, S. Sarkar, R.P. Kurjata, M.G. Sapozhnikov, S.-U. Chung, N. d'Hose, S.S. Dasgupta, H. Schmieden, V.D. Samoylenko, J. Bieling, M. Büchele, M. V. Zavertyaev, A.A. Lednev, M. Boer, H. Matsuda, N. Makke, A. Grasso, Christian Schill, A.S. Nunes, M. Slunecka, Günter Baum, O.Yu. Shevchenko, D. Panzieri, G.D. Alexeev, D. Neyret, K. Kurek, T. Michigami, K. Klimaszewski, B. Gobbo, T. Grussenmeyer, I. Gnesi, Andres Cicuttin, I. Orlov, A. Maggiora, M. Sulc, J. Bisplinghoff, N. Doshita, E. Zemlyanichkina, M. Wilfert, N. Kuchinski, J.M. Friedrich, N.S. Rossiyskaya, J.H. Koivuniemi, A. Austregesilo, S. Dalla Torre, J. Matousek, J. Pochodzalla, E. M. Kabuß, A. Sandacz, D. Hahne, T. Szameitat, S.V. Donskov, B. Ketzer, C. Marchand, Vladimir Nikolaenko, C. Regali, S. Ramos, K. Zaremba, V.F. Konstantinov, R. Akhunzyanov, Yu.A. Khokhlov, M. Krämer, M. Bodlak, R. Joosten, H. Wollny, K. Schmidt, S. Tessaro, M. Virius, Franco Bradamante, B. Grube, H. Fischer, A. Rychter, T. Guthörl, Yu. Kisselev, K. Bicker, M. Quaresma, R. Panknin, F. Thibaud, S. Takekawa, Yu. Ivanshin, K. Königsmann, R. Hashimoto, S. Uhl, R. Sulej, V.A. Polyakov, S. Huber, A. Amoroso, J. Barth, C. Braun, Bakur Parsamyan, Z.V. Kroumchtein, V. Jary, O.M. Kouznetsov, S. Platchkov, V. Anosov, N. du Fresne von Hohenesche, M. Finger, P.D. Eversheim, I. Konorov, F. Nerling, E. Rocco, C. Franco, F. Sozzi, S. Schopferer, G.K. Mallot, R. Birsa, T. Weisrock, J. Marzec, F.H. Heinsius, W. Eyrich, R. Windmolders, A.G. Olshevsky, N. Horikawa, F. Herrmann, F. Balestra, M. Levillain, V. Frolov, J. ter Wolbeek, G. Reicherz, Takahiro Iwata, Johannes Bernhard, P. Joerg, Andrea Bressan, S. Levorato, F. Tessarotto, C. Quintans, A. Lehmann, M. A. Faessler, D. von Harrach, T. Nagel, S. Goertz, F. Klein, G.V. Meshcheryakov, L. Silva, M. Dziewiecki, S. Sirtl, S. Grabmüller, W. Meyer, Maria Liz Crespo, O.P. Gavrichtchouk, L. Sinha, T. Matsuda, A. Zink, P. Sznajder, M.G. Alexeev, M. Stolarski, L. Steiger, A. Nagaytsev, A. Guskov, A. Szableski, F. Gautheron, J. Novy, F. Haas, C. Adolph, Yu.V. Mikhailov, R. Beck, S. Sosio, H. Suzuki, A. Filin, Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badełek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, Franco, Braun, C., Bressan, Andrea, Büchele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., DALLA TORRE, Silvia, Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, O. Y. u., Donskov, S. V., Doshita, N., Duic, Venicio, Dünnweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmüller, S., Grasso, A., Grube, B., Grussenmeyer, T., Guskov, A., Guthörl, T., Haas, F., von Harrach, D., Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Höppner, C. h., Horikawa, N., D'Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joerg, P., Joosten, R., Kabuß, E., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Krämer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, Stefano, Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, Nour, Mallot, G. K., Marchand, C., Martin, Anna, Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. D., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Rocco, E., Rossiyskaya, N. S., Ryabchikov, D. I., Rychter, A., Samoylenko, V. D., Sandacz, A., Sapozhnikov, M., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, Paolo, Schill, C., Schlüter, T., Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Schott, M., Shevchenko, O. Y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, Federica, Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szableski, A., Szameitat, T., Sznajder, P., Takekawa, Stefano, ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Virius, M., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: Particle physics, Nuclear and High Energy Physics, OZI rule, test, POLARIZATION, Proton, Meson, PROTON-PROTON COLLISIONS, LOW-ENERGY PHOTOPRODUCTION, ZWEIG-IIZUKA RULE, MESON PRODUCTION, EXPERIMENTAL TESTS, SELECTION RULE, NUCLEON, PION, Isoscalar, Nuclear Theory, OZI rule, High Energy Physics - Experiment, Nuclear physics, test, Invariant mass, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Vector meson, Nuclear Experiment, Spin-½, Physics, High Energy Physics::Phenomenology, Baryon, lcsh:QC770-798, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: Exclusive production of the isoscalar vector mesons $\omega$ and $\phi$ is measured with a 190 GeV$/c$ proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable $x_{F}$ of the fast proton. A significant violation of the OZI rule is found, confirming earlier findings. Its kinematic dependence on $x_{F}$ and on the invariant mass $M_{p\mathrm{V}}$ of the system formed by fast proton $p_\mathrm{fast}$ and vector meson $V$ is discussed in terms of diffractive production of $p_\mathrm{fast}V$ resonances in competition with central production. The measurement of the spin density matrix element $\rho_{00}$ of the vector mesons in different selected reference frames provides another handle to distinguish the contributions of these two major reaction types. Again, dependences of the alignment on $x_{F}$ and on $M_{p\mathrm{V}}$ are found. Most of the observations can be traced back to the existence of several excited baryon states contributing to $\omega$ production which are absent in the case of the $\phi$ meson. Removing the low-mass $M_{p\mathrm{V}}$ resonant region, the OZI rule is found to be violated by a factor of eight, independently of $x_\mathrm{F}$., Comment: 23 pages, 13 figures and 5 tables
Published: 2014

49. Measurement of radiative widths of a2(1320) and $ \pi_{2}$ (1670)

Author: M. Boer, A.A. Lednev, R. Panknin, A. Rychter, S. Sosio, C. Franco, P. Schiavon, H. Schmieden, J.M. Friedrich, N. Kuchinski, F. Nerling, François Herrmann, K. Zaremba, W. Eyrich, Nour Makke, N.S. Rossiyskaya, T. Schlueter, V.A. Polyakov, J. Bieling, T. Iwata, J. Bisplinghoff, O.P. Gavrichtchouk, Martin Bodlak, L. Sinha, N. Horikawa, G. Sbrizzai, A.G. Olshevsky, M. Quaresma, S. Huber, Vladimir Nikolaenko, E. Zemlyanichkina, Sergey Donskov, A. Bressan, T. Matsuda, Asher Berlin, M. Gorzellik, S. Tessaro, D. Hahne, Q. Curiel, A. Amoroso, M. Pešek, C. Braun, B. Badelek, B. Ketzer, A. Filin, S. Ramos, D. Neyret, H. Matsuda, A. Srnka, D.I. Ryabchikov, A. Grasso, A.S. Nunes, N. du Fresne von Hohenesche, Yu.V. Mikhailov, V. Anosov, Yu.A. Khokhlov, S. Dasgupta, Z.V. Kroumchtein, Frank Klein, M. Kraemer, V. Frolov, K. Schmidt, M. Ziembicki, P. Joerg, I. Gnesi, Anne-Laure Martin, D. Panzieri, Janusz Marzec, Andrew Ivanov, S. Neubert, B. Gobbo, P. Sznajder, Lei Wang, M. Virius, S. Sarkar, T. Guthoerl, S.S. Dasgupta, Aram Kotzinian, Norihiro Doshita, Federica Sozzi, C. Adolph, V. Andrieux, S. Schopferer, F. H. Heinsius, Matthias Schott, Alexander Schmidt, I.A. Savin, M. Wilfert, P. Bordalo, E. M. Kabuss, Laura Silva, N. d'Hose, E. Burtin, M. Slunečka, A. Lehmann, W.-D. Nowak, V.F. Konstantinov, D. von Harrach, P. Jasinski, Yu. Kisselev, S. Uhl, C. Quintans, Roland Windmolders, J. ter Wolbeek, H. Wollny, M.G. Alekseev, V.N. Kolosov, Adam Szabelski, Michal Dziewiecki, M. Ostrick, M. V. Zavertyaev, A. Austregesilo, Johannes Bernhard, C. Elia, A. Guskov, Jan Matousek, K. Schoenning, K. Klimaszewski, Yu. Ivanshin, Maxence Vandenbroucke, M. Finger~jr., G.V. Meshcheryakov, F. Thibaud, J. Barth, H. Fischer, K. Koenigsmann, Christian Schill, O.Yu. Shevchenko, S. Levorato, T. Nagel, Andres Cicuttin, I. Orlov, S. Grabmueller, K. Bicker, G. Reicherz, S. Goertz, P.D. Eversheim, O. Kouznetsov, S. Sirtl, H. Suzuki, Gerhard K. Mallot, A.V. Efremov, T. Szameitat, I. Konorov, Y. Miyachi, S. Dalla Torre, V.D. Samoylenko, J. Lichtenstadt, Franco Bradamante, Elena Rocco, F. Tessarotto, S. Ishimoto, Marcin Stolarski, T. Weisrock, T. Michigami, B. Grube, S. U. Chung, M. Finger, A. Magnon, J. Novy, C. Marchand, M. Chiosso, A. Sandacz, I. Uman, R.P. Kurjata, G.V. Khaustov, K. Kurek, S. Takekawa, G. Baum, L. Steiger, S. Platchkov, J.H. Koivuniemi, W. Meyer, Maria Liz Crespo, Miroslav Sulc, F. Hinterberger, Bakur Parsamyan, V. Jary, J. Pretz, J. Pochodzalla, Ch. Hoeppner, A. Maggiora, A. Nagaytsev, F. Balestra, R. Akhunzyanov, G. D. Alexeev, F. Haas, R. Geyer, S. G. Gerassimov, Fabrice Gautheron, M. A. Faessler, R. Sulej, O.Yu. Denisov, Z. Kral, F. Kunne, R. Beck, R. Birsa, S. Paul, R. Joosten, W. Duennweber, M. Buechele, L. Capozza, K. Kondo, R. Hashimoto, J. Vondra, Y. Bedfer, Andrea Ferrero, V. Duic, R. Jahn, Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badełek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, Franco, Braun, C., Bressan, Andrea, Büchele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., DALLA TORRE, Silvia, Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, O. Y. u., Donskov, S. V., Doshita, N., Duic, Venicio, Dünnweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmüller, S., Grasso, A., Grube, B., Guskov, A., Guthörl, T., Haas, F., von Harrach, D., Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Höppner, C. h., Horikawa, N., D’Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Jörg, P., Joosten, R., Kabuß, E., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kral, Z., Krämer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levorato, Stefano, Maggiora, A., Magnon, A., Makke, Nour, Mallot, G. K., Marchand, C., Martin, Anna, Marzec, J., Matousek, J., Matsuda, H., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. D., Nunes, A. S., Orlov, I., Olshevsky, A. G., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pesek, M., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Reicherz, G., Rocco, E., Rychter, A., Rossiyskaya, N. S., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, Paolo, Schill, C., Schlüter, T., Schmidt, A., Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Schott, M., Shevchenko, O. Y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, Federica, Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Takekawa, Stefano, ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Vandenbroucke, M., Virius, M., Vondra, J., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Matsuda, T., Lichtenstadt, J., Sznajder, P., and Ziembicki, M.
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, Scattering, Momentum transfer, Mathematics::Analysis of PDEs, Primakoff scattering, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Pion, Computer Science::Discrete Mathematics, pi2, Primakoff scattering, radiative width, a2, pi2, Radiative transfer, Coulomb, High Energy Physics::Experiment, Production (computer science), radiative width, Physics::Atomic Physics, Particle Physics - Experiment, a2
Abstract: The COMPASS Collaboration at CERN has investigated the reaction $\pi^- \gamma \rightarrow \pi^-\pi^-\pi^+$ embedded in the Primakoff reaction of $190~\textrm{GeV}$ pions scattering in the Coulomb field of a lead target, $\pi^- \text{Pb} \rightarrow \pi^-\pi^-\pi^+ \text{Pb}$. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at momentum transfer below $0.001~(\text{GeV}/c)^2$. Using a partial-wave analysis the amplitudes and relative phases of the $a_2(1320)$ and $\pi_2(1670)$ mesons have been extracted, and the Coulomb and the diffractive contributions have been disentangled. Measuring absolute production cross sections we have determined the radiative width of the $a_2(1320)$ to be $\Gamma_0(a_2(1320) \rightarrow \pi\gamma) = (358 \pm 6_{\textrm{stat}} \pm 42_{\textrm{syst}})~\textrm{keV}$. As the first measurement, $\Gamma_0(\pi_2(1670) \rightarrow \pi\gamma) = (181 \pm 11_{\textrm{stat}} \pm 27_{\textrm{syst}})~\textrm{keV} \cdot (\textrm{BR}^{\textrm{PDG}}_{f_2 \pi}/\textrm{BR}_{f_2 \pi})$ is obtained for the radiative width of the $\pi_2(1670)$, where in this analysis the branching ratio $\textrm{BR}^{\textrm{PDG}}_{f_2 \pi}=0.56$ has been used. We compare these values to previous measurements and theoretical predictions., Comment: 27 pages, 12 figures and 3 tables
Published: 2014

50. Dynamics of the16O(e,e′p)Reaction at High Missing Energies

Author: C. Cavata, A. Soldi, A. J. Sarty, Y. Roblin, Paul Souder, T. Pussieux, K. Wijesooriya, Ronald Ransome, S. Malov, Shalev Gilad, E. Burtin, M. Liang, C. W. de Jager, K. A. Aniol, M. Holtrop, E. A.J.M. Offermann, Wolfgang Korsch, B. Doyle, G. Quéméner, P. Djawotho, T. Terasawa, Vincent Breton, A. Gasparian, A. V. Glamazdin, K. Joo, D. Rowntree, R. Holmes, C. R. Howell, D. M. Manley, J. R. Calarco, R. W. Lourie, O. Ravel, J. W. Watson, Justin I. McIntyre, J. Gao, E. J. Brash, W. U. Boeglin, B. D. Anderson, G. J. Lolos, M. B. Epstein, G. M. Urciuoli, J. A. Templon, W. Kahl, C. E. Hyde-Wright, S. Kerhoas, A. Serdarevic-Offermann, N. d'Hose, F. T. Baker, C. F. Perdrisat, S. Platchkov, Kazushige Maeda, A. Deur, G. M. Huber, T. Saito, J. Martino, L. Auerbach, Bogdan Wojtsekhowski, J. Domingo, J. Berthot, J. Y. Mougey, R. I. Pomatsalyuk, A. Saha, L. Bimbot, H. Ueno, Kevin Fissum, Z. Papandreou, T. P. Smith, Jian-Ping Chen, L. Todor, A. Leone, James J. Kelly, Seigo Kato, P.Y. Bertin, Nilanga Liyanage, G. Rutledge, Hiroaki Tsubota, Z. L. Zhou, Richard Wilson, Branislav Vlahovic, H. Fonvieille, Gordon D. Cates, Mauro Iodice, Larry Weinstein, G. Laveissière, R. Suleiman, E. Cisbani, William Bertozzi, S. Nanda, G. Kumbartzki, Jing Zhao, R. Madey, D. G. Zainea, Ronald Gilman, R. Roche, D. S. Dale, K. McCormick, R. Michaels, L. Cardman, P. E. Ulmer, V. Zeps, S. van Verst, Pete Markowitz, J. M. Finn, S. Jaminion, H. Breuer, J. Gomez, J.E. Ducret, M. Khandaker, R. A. Lindgren, J. J. LeRose, M. Khayat, H. Voskanyan, C. Jutier, D. Neyret, V. Gorbenko, Roberto Perrino, R. De Leo, F. W. Hersman, L. A. Ewell, B. Diederich, Laird Kramer, M. K. Jones, G. G. Petratos, J. S. McCarthy, T. P. Gorringe, Z. E. Meziani, P. M. Rutt, Leonid Levchuk, David L. Prout, F. Garibaldi, V. A. Punjabi, S. Frullani, P. Vernin, R. L.J. van der Meer, D. J. Margaziotis, C. C. Chang, K. S. Kumar, Pavel Sorokin, K. Kino, B. Frois, and Charles Glashausser
Subjects: Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, 01 natural sciences, Nuclear physics, Cross section (geometry), Pion, 0103 physical sciences, Isobar, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: We measured the cross section and response functions for the quasielastic 16O(e,e'p) reaction for missing energies 25< or =E(m)< or =120 MeV at missing momenta P(m)< or =340 MeV/c. For 25
Published: 2001

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