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1. Measurement of the longitudinal spin transfer to Lambda and (Lambda)over-bar hyperons in polarised muon DIS

Author

Alexeev, Maxim, Alexakhin, Vy, Alexandrov, Y, Alexeev, Gd, Amoroso, Antonio, Austregesilo, A, Badelek, B, Balestra, Ferruccio, Ball, J, Barth, J, Baum, G, Bedfer, Y, Bernhard, J, Bertini, R, Bettinelli, M, Birsa, R, Bisplinghoff, J, Bordalo, P, Bradamante, F, Bravar, A, Bressan, A, Brona, G, Burtin, E, Bussa, Maria Pia, Chapiro, A, Chiosso, Michela, Chung, Su, Cicuttin, A, Colantoni, M, Crespo, Ml, Dalla Torre, S, Dafni, T, Das, S, Dasgupta, Ss, Denisov, Oy, Dhara, L, Diaz, V, Dinkelbach, Am, Donskov, Sv, Doshita, N, Duic, V, Dunnweber, W, Efremov, A, Eversheim, Pd, Eyrich, W, Faessler, M, Ferrero, A, Finger, M, Fischer, H, Franco, C, Friedrich, Jm, Garfagnini, R, Gautheron, F, Gavrichtchouk, Op, Gazda, R, Gerassimov, S, Geyer, R, Giorgi, M, Gobbo, B, Goertz, S, Grabmuller, S, Grajek, Oa, Grasso, Antonino, Grube, B, Gushterski, R, Guskov, A, Haas, F, von Harrach, D, Hasegawa, T, Heckmann, J, Heinsius, Fh, Hermann, M, Hermann, R, Herrmann, F, Hess, C, Hinterberger, F, Horikawa, N, Hoppner, C, D'Hose, N, Ilgner, C, Ishimoto, S, Ivanov, O, Ivanshin, Y, Iven, B, Iwata, T, Jahn, R, Jasinski, P, Jegou, G, Joosten, R, Kabuss, E, Kang, D, Ketzer, B, Khaustov, Gv, Khokhlov, Ya, Kisselev, Y, Klein, F, Klimaszewski, K, Koblitz, S, Koivuniemi, Jh, Kolosov, Vn, Komissarov, Ev, Kondo, K, Konigsmann, K, Konopka, R, Konorov, I, Konstantinov, Vf, Korzenev, A, Kotzinian, Am, Kouznetsov, O, Kowalik, K, Kramer, M, Kral, A, Kroumchtein, Zv, Kuhn, R, Kunne, F, Kurek, K, Le Goff JM, Lednev, Aa, Lehmann, A, Levorato, S, Lichtenstadt, J, Liska, T, Maggiora, A, Maggiora, Marco, Magnon, A, Mallot, Gk, Mann, A, Marchand, C, Marroncle, J, Martin, A, Marzec, J, Massmann, F, Matsuda, T, Maximov, An, Meyer, W, Michigami, T, Mikhailov, Yv, Moinester, Ma, Mutter, A, Nagaytsev, A, Nagel, T, Nassalski, J, Negrini, S, Nerling, F, Neubert, S, Neyret, D, Nikolaenko, Vi, Olshevsky, Ag, Ostrick, M, Padee, A, Panknin, R, Panzieri, D, Parsamyan, Bakur, Paul, S, Pawlukiewicz Kaminska, B, Perevalova, E, Pesaro, G, Peshekhonov, Dv, Piragino, Guido, Platchkov, S, Pochodzalla, J, Polak, J, Polyakov, Va, Pontecorvo, G, Pretz, J, Quintans, C, Rajotte, Jf, Ramos, S, Rapatsky, V, Reicherz, G, Reggiani, D, Richter, A, Robinet, F, Rocco, Elena, Rondio, E, Ryabchikov, Di, Samoylenko, Vd, Sandacz, A, Santos, H, Sapozhnikov, Mg, Sarkar, S, Sbrizzai, G, Schiavon, P, Schill, C, Schmitt, L, Schroder, W, Shevchenko, Oy, Siebert, Hw, Silva, L, Sinha, L, Sissakian, An, Slunecka, M, Smirnov, Gi, Sosio, Stefano, Sozzi, F, Srnka, A, Stolarski, M, Sulc, M, Sulej, R, Takekawa, S, Tessaro, S, Tessarotto, F, Teufel, A, Tkatchev, Lg, Venugopal, G, Virius, M, Vlassov, Nv, Vossen, A, Weitzel, Q, Windmolders, R, Wislicki, W, Wollny, H, Zaremba, K, Zemlyanichkina, E, Ziembicki, M, Zhao, J, Zhuravlev, N, and Zvyagin, A.

Subjects
CHARGED-CURRENT INTERACTIONS, DEEP, NOMAD EXPERIMENT, ASYMMETRY, SCATTERING, STRANGE PARTICLE-PRODUCTION, NUCLEON, FRAGMENTATION, NEUTRINO, DECAYS
Published
2009

2. The polarized double cell target of the SMC

Author

Adams, D., Adeva, B., Arik, E., Arvidson, A., Badelek, B., Ballintijn, Mk, Bardin, G., Baum, G., Berglund, P., Betev, L., Bird, Ig, Birsa, R., Bjorkholm, P., Bonner, Be, Botton, N., Boutemeur, M., Bradamante, F., Bravar, A., Bressan, A., Bultmann, S., Burtin, E., Cavata, C., Crabb, D., Cranshaw, J., Cuhadar, T., Dalla Torre, S., Dantzig, R., Derro, B., Deshpande, A., Dhawan, S., Dulya, C., Dyring, A., Eichblatt, S., Faivre, Jc, Fasching, D., Feinstein, F., Fernandez, C., Forthmann, S., Frois, B., Gallas, A., Garzon, Ja, Gaussiran, T., Gilly, H., Giorgi, M., Goeler, E., Goertz, S., Gracia, G., Groot, N., Perdekamp, Mg, Gulmez, E., Haft, K., Harrach, D., Hasegawa, T., Hautle, P., Hayashi, N., Heusch, Ca, Horikawa, N., Hughes, Vw, Igo, G., Ishimoto, S., Iwata, T., Kabuss, Em, Kageya, T., Karev, A., Kessler, Hj, Ketel, Tj, Kiryluk, J., Kishi, A., Kisselev, Y., Klostermann, L., Kramer, D., Krivokhijine, V., Kroger, W., Kurek, K., Kyynarainen, J., Lamanna, M., Landgraf, U., Layda, T., Le Goff, Jm, Lehar, F., Lesquen, A., Lichtenstadt, J., Lindqvist, T., Litmaath, M., Lowe, M., Magnon, A., Mallot, Gk, Marie, F., Martin, A., Martino, J., Matsuda, T., Mayes, B., Mccarthy, Js, Medved, K., Meyer, W., Middelkoop, G., Miller, D., Miyachi, Y., Mori, K., Moromisato, J., Nassalski, J., Naumann, L., Neganov, B., Niinikoski, To, Oberski, Jej, Ogawa, A., Ozben, C., Parks, Dp, Pereira, H., Penzo, A., Perrot-Kunne, F., Peshekhonov, D., Piegaia, R., Pinsky, L., Platchkov, S., Plo, M., Pose, D., Postma, H., Pretz, J., Pussieux, T., Pyrlik, J., Radel, G., Reyhancan, I., Reicherz, G., Rienbland, Jm, Rijllart, A., Roberts, Jb, Rock, S., Rodriguez, M., Rondio, E., Rosado, A., Roscherr, B., Sabo, I., Saborido, J., Sandacz, A., Savin, I., Schiavon, P., Schiller, A., Schuler, Kp, Segel, R., Seitz, R., Semertzidis, Y., Sever, F., Shanahan, P., Sichtermann, Ep, Simeoni, F., Smirnov, Gi, Staude, A., Steinmetz, A., Stiegler, U., Stuhrmann, H., Szleper, M., Teichert, Km, Tessarotto, F., Thers, D., Tlaczala, W., Trentalange, S., Tripet, A., Unel, G., Velasco, M., Vogt, J., Voss, R., Weinstein, R., Whitten, C., Windmolders, R., Regine Willumeit, Wislicki, W., Witzmann, A., Zanetti, Am, Zaremba, K., Zhao, J., and Spin Muon Collaboration

3. Spin structure of the proton from polarized inclusive deep-inelastic muon-proton scattering

Author

Adams, D., Adeva, B., Arik, E., Arvidson, A., Badelek, B., Ballintijn, M. K., Bardin, G., Baum, G., Berglund, P., Betev, L., Bird, I. G., Birsa, R., Bjorkholm, P., Bonner, B. E., Botton, N., Boutemeur, M., Bradamante, F., Bravar, A., Andrea Bressan, Bultmann, S., Burtin, E., Cavata, C., Crabb, D., Cranshaw, J., Çuhadar, T., Dalla Torre, S., Dantzig, R., Derro, B., Deshpande, A., Dhawan, S., Dulya, C., Dyring, A., Eichblatt, S., Faivre, J. C., Fasching, D., Feinstein, F., Fernandez, C., Frois, B., Gallas, A., Garzon, J. A., Gaussiran, T., Giorgi, M., Goeler, E., Gracia, G., Groot, N., Grosse Perdekamp, M., Gulmez, E., Harrach, D., Hasegawa, T., Hautle, P., Hayashi, N., Heusch, C. A., Horikawa, N., Hughes, V. W., Igo, G., Ishimoto, S., Iwata, T., Kabuß, E. M., Karev, A., Kessler, H. J., Ketel, T. J., Kishi, A., Kisselev, Y., Klostermann, L., Krämer, D., Krivokhijine, V., Kroger, W., Kurek, K., Kyynäräinen, J., Lamanna, M., Landgraf, U., Layda, T., Le Goff, J. M., Lehar, F., Lesquen, A., Lichtenstadt, J., Lindqvist, T., Litmaath, M., Lowe, M., Magnon, A., Mallot, G. K., Marie, F., Martin, A., Martino, J., Matsuda, T., Mayes, B., Mccarthy, J. S., Medved, K., Middelkoop, G., Miller, D., Mori, K., Moromisato, J., Nagaitsev, A., Nassalski, J., Naumann, L., Niinikoski, T. O., Oberski, J. E. J., Ogawa, A., Ozben, C., Parks, D. P., Penzo, A., Perrot-Kunne, F., Peshekhonov, D., Piegaia, R., Pinsky, L., Platchkov, S., Plo, M., Pose, D., Postma, H., Pretz, J., Pussieux, T., Pyrlik, J., Reyhancan, I., Rijllart, A., Roberts, J. B., Rock, S., Rodriguez, M., Rondio, E., Rosado, A., Sabo, I., Saborido, J., Sandacz, A., Savin, I., Schiavon, P., Schuler, K. P., Segel, R., Seitz, R., Semertzidis, Y., Sever, F., Shanahan, P., Sichtermann, E. P., Simeoni, F., Smirnov, G. I., Staude, A., Steinmetz, A., Stiegler, U., Stuhrmann, H., Szleper, M., Teichert, K. M., Tessarotto, F., Tlaczala, W., Trentalange, S., Unel, G., Velasco, M., Vogt, J., Voss, R., Weinstein, R., Whitten, C., Windmolders, R., Willumeit, R., Wislicki, W., Witzmann, A., Zanetti, A. M., Zaremba, K., Zhao, J., Faculty of Science, Adams, D, Adeva, B, Arik, E, Arvidson, A, Badelek, B, Ballintijn, Mk, Bardin, G, Baum, G, Berglund, P, Betev, L, Bird, Ig, Birsa, Renato, Bjorkholm, P, Bonner, Be, Debotton, N, Boutemeur, M, Bradamante, Franco, Bravar, A, Bressan, Andrea, Bultmann, S, Burtin, E, Cavata, C, Crabb, D, Cranshaw, J, Cuhadar, T, DALLA TORRE, Silvia, Vandantzig, R, Derro, B, Deshpande, A, Dhawan, S, Dulya, C, Dyring, A, Eichblatt, S, Faivre, Jc, Fasching, D, Feinstein, F, Fernandez, C, Frois, B, Gallas, A, Garzon, Ja, Gaussiran, T, Giorgi, Marcello, Vongoeler, E, Gracia, G, Degroot, N, Perdekamp, Mg, Gulmez, E, Vonharrach, D, Hasegawa, T, Hautle, P, Hayashi, N, Heusch, Ca, Horikawa, N, Hughes, Vw, Igo, G, Ishimoto, S, Iwata, T, Kabuss, Em, Karev, A, Kessler, Hj, Ketel, Tj, Kishi, A, Kisselev, Y, Klostermann, L, Kramer, D, Krivokhijine, V, Kroger, W, Kurek, K, Kyynarainen, J, Lamanna, M, Landgraf, U, Layda, T, Legoff, Jm, Lehar, F, Delesquen, A, Lichtenstadt, J, Lindqvist, T, Litmaath, M, Lowe, M, Magnon, A, Mallot, Gk, Marie, F, Martin, Anna, Martino, J, Matsuda, T, Mayes, B, Mccarthy, J, Medved, K, Vanmiddelkoop, G, Miller, D, Mori, K, Moromisato, J, Nagaitsev, A, Nassalski, J, Naumann, L, Niinikoski, To, Oberski, Jej, Ogawa, A, Ozben, C, Parks, Dp, Penzo, A, Perrotkunne, F, Peshekhonov, D, Piegaia, R, Pinsky, L, Platchkov, S, Plo, M, Pose, D, Postma, H, Pretz, J, Pussieux, T, Pyrlik, J, Reyhancan, I, Rijllart, A, Roberts, Jb, Rock, S, Rodriguez, M, Rondio, E, Rosado, A, Sabo, I, Saborido, J, Sandacz, A, Savin, I, Schiavon, Paolo, Schuler, Kp, Segel, R, Seitz, R, Semertzidis, Y, Sever, F, Shanahan, P, Sichtermann, Ep, Simeoni, Fabrizio, Smirnov, Gi, Staude, A, Steinmetz, A, Stiegler, U, Stuhrmann, H, Szleper, M, Teichert, Km, Tessarotto, F, Tlaczala, W, Trentalange, S, Unel, G, Velasco, M, Vogt, J, Voss, R, Weinstein, R, Whitten, C, Windmolders, R, Willumeit, R, Wislicki, W, Witzmann, A, Zanetti, ANNA MARIA, Zaremba, K, and Zhao, J.

Subjects
Nuclear and High Energy Physics, Particle physics, Proton, proton spin structure, FOS: Physical sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Factorization, Quantum mechanics, Operator product expansion, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, Quantum chromodynamics, DIS, Muon, SMC, High Energy Physics::Phenomenology, Charge (physics), High Energy Physics - Phenomenology, High Energy Physics::Experiment, Sum rule in quantum mechanics, Electron scattering, Particle Physics - Experiment
Abstract

We have measured the spin-dependent structure function $g_1^p$ in inclusive deep-inelastic scattering of polarized muons off polarized protons, in the kinematic range $0.003 < x < 0.7$ and $1 GeV^2 < Q^2 < 60 GeV^2$. A next-to-leading order QCD analysis is used to evolve the measured $g_1^p(x,Q^2)$ to a fixed $Q^2_0$. The first moment of $g_1^p$ at $Q^2_0 = 10 GeV^2$ is $\Gamma^p = 0.136\pm 0.013(stat.) \pm 0.009(syst.)\pm 0.005(evol.)$. This result is below the prediction of the Ellis-Jaffe sum rule by more than two standard deviations. The singlet axial charge $a_0$ is found to be $0.28 \pm 0.16$. In the Adler-Bardeen factorization scheme, $\Delta g \simeq 2$ is required to bring $\Delta \Sigma$ in agreement with the Quark-Parton Model. A combined analysis of all available proton and deuteron data confirms the Bjorken sum rule., Comment: 33 pages, 22 figures, uses ReVTex and smc.sty. submitted to Physical Review D

Published
1997

4. Study of inelastic nuclear interactions of 400 GeV/c protons in bent silicon crystals for beam steering purposes.

Author

Scandale W, Andrisani F, Arduini G, Cerutti F, Garattini M, Gilardoni S, Masi A, Mirarchi D, Montesano S, Petrucci S, Redaelli S, Schoofs P, Rossi R, Breton D, Chaumat D, Dubos S, Maalmi J, Natochii A, Puill V, Stocchi A, Bagli E, Bandiera L, Germogli G, Guidi V, Mazzolari A, Murtas F, Addesa F, Cavoto G, Iacoangeli F, Galluccio F, Afonin AG, Chesnokov YA, Durum AA, Maisheev VA, Sandomirskiy YE, Yanovich AA, Kovalenko AD, Taratin AM, Smirnov GI, Desinov AS, Gavrikov YA, Ivanov YM, Lapina LP, Malyarenko LG, Skorobogatov VV, Fulcher J, James T, Hall G, Pesaresi M, and Raymond M

Abstract

Inelastic nuclear interaction probability of 400 GeV/c protons interacting with bent silicon crystals was investigated, in particular for both types of crystals installed at the CERN Large Hadron Collider for beam collimation purposes. In comparison to amorphous scattering interaction, in planar channeling this probability is ∼ 36 % for the quasi-mosaic type (planes (111)), and ∼ 27 % for the strip type (planes (110)). Moreover, the absolute inelastic nuclear interaction probability in the axial channeling orientation, along the ⟨ 110 ⟩ axis, was estimated for the first time, finding a value of 0.6 % for a crystal 2 mm long along the beam direction, with a bending angle of 55 μ rad. This value is more than two times lower with respect to the planar channeling orientation of the same crystal, and increases with the vertical angular misalignment. Finally, the correlation between the inelastic nuclear interaction probability in the planar channeling and the silicon crystal curvature is reported.

Published
2018
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5. First measurement of chiral dynamics in π- γ → π- π- π+.

Author

Adolph C, Alekseev MG, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Antonov AA, Austregesilo A, Badełek B, Balestra F, Barth J, Baum G, Bedfer Y, Bernhard J, Bertini R, Bettinelli M, Bicker KA, Birsa R, Bisplinghoff J, Bordalo P, Bradamante F, Braun C, Bravar A, Bressan A, Burtin E, Chaberny D, Chiosso M, Chung SU, Cicuttin A, Crespo ML, Dalla Torre S, Das S, Dasgupta SS, Denisov OY, Dhara L, Donskov SV, Doshita N, Duic V, Dünnweber W, Dziewiecki M, Efremov A, Elia C, Eversheim PD, Eyrich W, Faessler M, Ferrero A, Filin A, Finger M, Finger M Jr, Fischer H, Franco C, du Fresne von Hohenesche N, Friedrich JM, Garfagnini R, Gautheron F, Gavrichtchouk OP, Gazda R, Gerassimov S, Geyer R, Giorgi M, Gnesi I, Gobbo B, Goertz S, Grabmüller S, Grasso A, Grube B, Gushterski R, Guskov A, Haas F, von Harrach D, Hasegawa T, Heinsius FH, Herrmann F, Hess C, Hinterberger F, Horikawa N, Höppner Ch, d'Hose N, Huber S, Ishimoto S, Ivanov O, Ivanshin Y, Iwata T, Jahn R, Jasinski P, Jegou G, Joosten R, Kabuss E, Kang D, Ketzer B, Khaustov GV, Khokhlov YA, Kisselev Y, Klein F, Klimaszewski K, Koblitz S, Koivuniemi JH, Kolosov VN, Kondo K, Königsmann K, Konorov I, Konstantinov VF, Korzenev A, Kotzinian AM, Kouznetsov O, Krämer M, Kroumchtein ZV, Kunne F, Kurek K, Lauser L, Lednev AA, Lehmann A, Levorato S, Lichtenstadt J, Maggiora A, Magnon A, Makke N, Mallot GK, Mann A, Marchand C, Martin A, Marzec J, Massmann F, Matsuda T, Meyer W, Michigami T, Mikhailov YV, Moinester MA, Morreale A, Mutter A, Nagaytsev A, Nagel T, Nerling F, Neubert S, Neyret D, Nikolaenko VI, Nowak WD, Nunes AS, Olshevsky AG, Ostrick M, Padee A, Panknin R, Panzieri D, Parsamyan B, Paul S, Perevalova E, Pesaro G, Peshekhonov DV, Piragino G, Platchkov S, Pochodzalla J, Polak J, Polyakov VA, Pontecorvo G, Pretz J, Quintans C, Rajotte JF, Ramos S, Rapatsky V, Reicherz G, Richter A, Rocco E, Rondio E, Rossiyskaya NS, Ryabchikov DI, Samoylenko VD, Sandacz A, Sapozhnikov MG, Sarkar S, Savin IA, Sbrizzai G, Schiavon P, Schill C, Schlüter T, Schmitt L, Schönning K, Schopferer S, Schröder W, Shevchenko OY, Siebert HW, Silva L, Sinha L, Sissakian AN, Slunecka M, Smirnov GI, Sosio S, Sozzi F, Srnka A, Stolarski M, Sulc M, Sulej R, Sznajder P, Takekawa S, Ter Wolbeek J, Tessaro S, Tessarotto F, Teufel A, Tkatchev LG, Uhl S, Uman I, Vandenbroucke M, Virius M, Vlassov NV, Windmolders R, Wiślicki W, Wollny H, Zaremba K, Zavertyaev M, Zemlyanichkina E, Ziembicki M, Zhuravlev N, and Zvyagin A

Abstract

The COMPASS Collaboration at CERN has investigated the π- γ → π- π- π+ reaction at center-of-momentum energy below five pion masses, sqrt[s]<5m(π), embedded in the Primakoff reaction of 190 GeV pions impinging on a lead target. Exchange of quasireal photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, t'<0.001  GeV2/c2. Using partial-wave analysis techniques, the scattering intensity of Coulomb production described in terms of chiral dynamics and its dependence on the 3π-invariant mass m(3π)=sqrt[s] were extracted. The absolute cross section was determined in seven bins of sqrt[s] with an overall precision of 20%. At leading order, the result is found to be in good agreement with the prediction of chiral perturbation theory over the whole energy range investigated.

Published
2012
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6. Observation of a J(PC)=1-+ exotic resonance in diffractive dissociation of 190   GeV/c π- into π- π- π+.

Author

Alekseev MG, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Austregesilo A, Badełek B, Balestra F, Ball J, Barth J, Baum G, Bedfer Y, Bernhard J, Bertini R, Bettinelli M, Birsa R, Bisplinghoff J, Bordalo P, Bradamante F, Bravar A, Bressan A, Brona G, Burtin E, Bussa MP, Chapiro A, Chiosso M, Chung SU, Cicuttin A, Colantoni M, Crespo ML, Dalla Torre S, Dafni T, Das S, Dasgupta SS, Denisov OY, Dhara L, Diaz V, Dinkelbach AM, Donskov SV, Doshita N, Duic V, Dünnweber W, Efremov A, El Alaoui A, Eversheim PD, Eyrich W, Faessler M, Ferrero A, Finger M, Finger M Jr, Fischer H, Franco C, Friedrich JM, Garfagnini R, Gautheron F, Gavrichtchouk OP, Gazda R, Gerassimov S, Geyer R, Giorgi M, Gobbo B, Goertz S, Grabmüller S, Grajek OA, Grasso A, Grube B, Gushterski R, Guskov A, Haas F, von Harrach D, Hasegawa T, Heckmann J, Heinsius FH, Hermann R, Herrmann F, Hess C, Hinterberger F, Horikawa N, Höppner Ch, d'Hose N, Ilgner C, Ishimoto S, Ivanov O, Ivanshin Y, Iwata T, Jahn R, Jasinski P, Jegou G, Joosten R, Kabuss E, Kang D, Ketzer B, Khaustov GV, Khokhlov YA, Kisselev Y, Klein F, Klimaszewski K, Koblitz S, Koivuniemi JH, Kolosov VN, Komissarov EV, Kondo K, Königsmann K, Konopka R, Konorov I, Konstantinov VF, Korzenev A, Kotzinian AM, Kouznetsov O, Kowalik K, Krämer M, Kral A, Kroumchtein ZV, Kuhn R, Kunne F, Kurek K, Lauser L, Le Goff JM, Lednev AA, Lehmann A, Levorato S, Lichtenstadt J, Liska T, Maggiora A, Maggiora M, Magnon A, Mallot GK, Mann A, Marchand C, Marroncle J, Martin A, Marzec J, Massmann F, Matsuda T, Maximov AN, Meyer W, Michigami T, Mikhailov YV, Moinester MA, Mutter A, Nagaytsev A, Nagel T, Nassalski J, Negrini T, Nerling F, Neubert S, Neyret D, Nikolaenko VI, Olshevsky AG, Ostrick M, Padee A, Panknin R, Panzieri D, Parsamyan B, Paul S, Pawlukiewicz-Kaminska B, Perevalova E, Pesaro G, Peshekhonov DV, Piragino G, Platchkov S, Pochodzalla J, Polak J, Polyakov VA, Pontecorvo G, Pretz J, Quintans C, Rajotte JF, Ramos S, Rapatsky V, Reicherz G, Reggiani D, Richter A, Robinet F, Rocco E, Rondio E, Ryabchikov DI, Samoylenko VD, Sandacz A, Santos H, Sapozhnikov MG, Sarkar S, Savin IA, Sbrizzai G, Schiavon P, Schill C, Schlüter T, Schmitt L, Schopferer S, Schröder W, Shevchenko OY, Siebert HW, Silva L, Sinha L, Sissakian AN, Slunecka M, Smirnov GI, Sosio S, Sozzi F, Srnka A, Stolarski M, Sulc M, Sulej R, Takekawa S, Tessaro S, Tessarotto F, Teufel A, Tkatchev LG, Uhl S, Uman I, Venugopal G, Virius M, Vlassov NV, Vossen A, Weitzel Q, Windmolders R, Wiślicki W, Wollny H, Zaremba K, Zavertyaev M, Zemlyanichkina E, Ziembicki M, Zhao J, Zhuravlev N, and Zvyagin A

Abstract

The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the π- π- π+ final state using a 190  GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420,000 events taken at values of the squared 4-momentum transfer t' between 0.1 and 1  GeV2/c2. The well-known resonances a1(1260), a2(1320), and π2(1670) are clearly observed. In addition, the data show a significant natural-parity exchange production of a resonance with spin-exotic quantum numbers J(PC)=1-+ at 1.66  GeV/c2 decaying to ρπ. The resonant nature of this wave is evident from the mass-dependent phase differences to the J(PC)=2-+ and 1++ waves. From a mass-dependent fit a resonance mass of (1660±10(-64)(+0))  MeV/c2 and a width of (269±21(-64)(+42))  MeV/c2 are deduced, with an intensity of (1.7±0.2)% of the total intensity.

Published
2010
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7. First measurement of the transverse spin asymmetries of the deuteron in semi-inclusive deep inelastic scattering.

Author

Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Badełek B, Balestra F, Ball J, Baum G, Bedfer Y, Berglund P, Bernet C, Bertini R, Birsa R, Bisplinghoff J, Bradamante F, Bravar A, Bressan A, Burtin E, Bussa MP, Cerini L, Chapiro A, Cicuttin A, Colantoni M, Colavita AA, Costa S, Crespo ML, d'Hose N, Dalla Torre S, Dasgupta SS, De Masi R, Dedek N, Denisov OY, Dhara L, Diaz Kavka V, Dolgopolov AV, Donskov SV, Dorofeev VA, Doshita N, Duic V, Dünnweber W, Efremov A, Ehlers J, Eversheim PD, Eyrich W, Fabro M, Faessler M, Fauland P, Ferrero A, Ferrero L, Finger M, Finger M Jr, Fischer H, Franz J, Friedrich JM, Frolov V, Fuchs U, Garfagnini R, Gautheron F, Gavrichtchouk OP, Gerassimov S, Geyer R, Giorgi M, Gobbo B, Goertz S, Grajek OA, Grasso A, Grube B, Grünemaier A, Gustafsson K, Hannappel J, von Harrach D, Hasegawa T, Hedicke S, Heinsius FH, Hinterberger F, von Hodenberg M, Horikawa N, Horikawa S, Ijaduola RB, Ilgner C, Ishimoto S, Iwata T, Jahn R, Janata A, Joosten R, Jouravlev NI, Kabuss E, Kalinnikov V, Kang D, Karstens F, Kastaun W, Ketzer B, Khaustov GV, Khokhlov YA, Kisselev Y, Klein F, Koivuniemi JH, Kolosov VN, Komissarov EV, Kondo K, Königsmann K, Konoplyannikov AK, Konorov I, Konstantinov VF, Korentchenko AS, Korzenev A, Kotzinian AM, Koutchinski NA, Kowalik K, Kravchuk NP, Krivokhizhin GV, Kroumchtein ZV, Kuhn R, Kunne F, Kurek K, Lamanna M, Le Goff JM, Leberig M, Lichtenstadt J, Maggiora A, Maggiora M, Magnon A, Mallot GK, Manuilov IV, Marchand C, Marroncle J, Martin A, Marzec J, Matsuda T, Maximov AN, Medved KS, Meyer W, Mielech A, Mikhailov YV, Moinester MA, Nähle O, Nassalski J, Neyret DP, Nikolaenko VI, Nozdrin AA, Obraztsov VF, Olshevsky AG, Ostrick M, Padee A, Pagano P, Panebianco S, Panzieri D, Paul S, Pereira HD, Peshekhonov DV, Peshekhonov VD, Piragino G, Platchkov S, Platzer K, Pochodzalla J, Polyakov VA, Popov AA, Pretz J, Rebourgeard PC, Reicherz G, Reymann J, Rozhdestvensky AM, Rondio E, Sadovski AB, Saller E, Samoylenko VD, Sandacz A, Sans M, Sapozhnikov MG, Savin IA, Schiavon P, Schmidt T, Schmitt H, Schmitt L, Shishkin AA, Siebert H, Sinha L, Sissakian AN, Skachkova A, Slunecka M, Smirnov GI, Sugonyaev VP, Stinzing F, Sulej R, Takabayashi N, Tchalishev VV, Tessarotto F, Teufel A, Thers D, Tkatchev LG, Toeda T, Tretyak VI, Trousov S, Vlassov NV, Webb R, Weise E, Wiesmann M, Windmolders R, Wirth S, Wiślicki W, Zanetti AM, Zaremba K, Zhao J, Ziegler R, and Zvyagin A

Abstract

First measurements of the Collins and Sivers asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarized 6LiD target are presented. The data were taken in 2002 with the COMPASS spectrometer using the muon beam of the CERN SPS at 160 GeV/c. The Collins asymmetry turns out to be compatible with zero, as does the measured Sivers asymmetry within the present statistical errors.

Published
2005
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