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1. EXTRACTION OF THE GLUON DENSITY OF THE PROTON AT X

Author

M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, J. Schlereth, R. Stanek, R.L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, F. Frasconi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari, A. Polini, G. Sartorelli, R. Timellini, Y. Zamora Garcia, A. Zichichi, A. Bargende, J. Crittenden, K. Desch, B. Diekmann, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, G. Geitz, M. Grothe, H. Hartmann, D. Haun, K. Heinloth, E. Hilger, H.-P. Jakob, U.F. Katz, S.M. Mari, A. Mass, S. Mengel, J. Mollen, E. Paul, Ch. Rembser, R. Schattevoy, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, N. Dyce, B. Foster, S. George, R. Gilmore, G.P. Heath, H.F. Heath, T.J. Llewellyn, C.J.S. Morgado, D.J.P. Norman, J.A. O'Mara, R.J. Tapper, S.S. Wilson, R. Yoshida, R.R. Rau, M. Arneodo, L. Iannotti, M. Schioppa, G. Susinno, A. Bernstein, A. Caldwell, J.A. Parsons, S. Ritz, F. Sciulli, P.B. Straub, L. Wai, S. Yang, P. Borzemski, J. Chwastowski, A. Eskreys, K. Piotrzkowski, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Eskreys, K. Jelén, D. Kisielewska, T. Kowalski, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, T. Kȩdzierski, A. Kotański, M. Przybycień, L.A.T. Bauerdick, U. Behrens, J.K. Bienlein, S. Böttcher, C. Coldewey, G. Drews, M. Flasiński, D.J. Gilkinson, P. Göttlicher, B. Gutjahr, T. Haas, W. Hain, D. Hasell, H. Heβling, H. Hultschig, Y. Iga, P. Joos, M. Kasemann, R. Klanner, W. Koch, L. Köpke, U. Kötz, H. Kowalski, W. Kröger, J. Krüger, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, O. Mańczak, J.S.T. Ng, S. Nickel, D. Notz, K. Ohrenberg, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, E. Stiliaris, T. Voβ, D. Westphal, G. Wolf, C. Youngman, H.J. Grabosch, A. Leich, A. Meyer, C. Rethfeldt, S. Schlenstedt, G. Barbagli, P. Pelfer, G. Anzivino, G. Maccarrone, S. De Pasquale, S. Qian, L. Votano, A. Bamberger, A. Freidhof, T. Poser, S. Söldner-Rembold, J. Schroeder, G. Theisen, T. Trefzger, N.H. Brook, P.J. Bussey, A.T. Doyle, I. Fleck, V.A. Jamieson, D.H. Saxon, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, H. Kammerlocher, B. Krebs, T. Neumann, R. Sinkus, K. Wick, E. Badura, B.D. Burow, A. Fürtjes, L. Hagge, E. Lohrmann, J. Mainusch, J. Milewski, M. Nakahata, N. Pavel, G. Poelz, W. Schott, J. Terron, F. Zetsche, T.C. Bacon, R. Beuselinck, I. Butterworth, E. Gallo, V.L. Harris, B.H. Hung, K.R. Long, D.B. Miller, P.P.O. Morawitz, A. Prinias, J.K. Sedgbeer, A.F. Whitfield, U. Mallik, E. McCliment, M.Z. Wang, S.M. Wang, J.T. Wu, Y. Zhang, P. Cloth, D. Filges, S.H. An, S.M. Hong, S.W. Nam, S.K. Park, M.H. Suh, S.H. Yon, R. Imlay, S. Kartik, H.-J. Kim, R.R. McNeil, W. Metcalf, V.K. Nadendla, F. Barreiro, G. Cases, R. Graciani, J.M. Hernández, L. Hervás, L. Labarga, J. del Peso, J. Puga, J.F. de Trocóniz, F. Ikraiam, J.K. Mayer, G.R. Smith, F. Corriveau, D.S. Hanna, J. Hartmann, L.W. Hung, J.N. Lim, C.G. Matthews, P.M. Patel, L.E. Sinclair, D.G. Stairs, M. St.Laurent, R. Ullmann, G. Zacek, V. Bashkirov, B.A. Dolgoshein, A. Stifutkin, G.L. Bashindzhagyan, P.F. Ermolov, L.K. Gladilin, Y.A. Golubkov, V.D. Kobrin, V.A. Kuzmin, A.S. Proskuryakov, A.A. Savin, L.M. Shcheglova, A.N. Solomin, N.P. Zotov, S. Bentvelsen, M. Botje, F. Chlebana, A. Dake, J. Engelen, P. de Jong, M. de Kamps, P. Kooijman, A. Kruse, V. O'Dell, A. Tenner, H. Tiecke, W. Verkerke, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, K. Honscheid, C. Li, T.Y. Ling, K.W. McLean, W.N. Murray, I.H. Park, T.A. Romanowski, R. Seidlein, D.S. Bailey, G.A. Blair, A. Byrne, R.J. Cashmore, A.M. Cooper-Sarkar, D. Daniels, R.C.E. Devenish, N. Harnew, M. Lancaster, P.E. Luffman, L. Lindemann, J. McFall, C. Nath, A. Quadt, H. Uijterwaal, R. Walczak, F.F. Wilson, T. Yip, G. Abbiendi, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, J. Bulmahn, J.M. Butterworth, R.G. Feild, B.Y. Oh, J.J. Whitmore, G. D'Agostini, M. Iori, G. Marini, M. Mattioli, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, K. Prytz, T.P. Shah, T.L. Short, E. Barberis, N. Cartiglia, T. Dubbs, C. Heusch, M. Van Hook, B. Hubbard, W. Lockman, J.T. Rahn, H.F.-W. Sadrozinski, A. Seiden, J. Biltzinger, R.J. Seifert, A.H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, A. Levy, T. Hasegawa, M. Hazumi, T. Ishii, M. Kuze, S. Mine, Y. Nagasawa, T. Nagira, M. Nakao, I. Suzuki, K. Tokushuku, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, S. Nagayama, Y. Nakamitsu, R. Cirio, M. Costa, M.I. Ferrero, L. Lamberti, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D.C. Bailey, D. Bandyopadhyay, F. Benard, M. Brkic, M.B. Crombie, D.M. Gingrich, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, C.R. Sampson, R.J. Teuscher, C.D. Catterall, T.W. Jones, P.B. Kaziewicz, J.B. Lane, R.L. Saunders, J. Shulman, K. Blankenship, J. Kochocki, B. Lu, L.W. Mo, W. Bogusz, K. Charchuł, a, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Zarnecki, M. Adamus, Y. Eisenberg, C. Glasman, U. Karshon, D. Revel, A. Shapira, I. Ali, B. Behrens, S. Dasu, C. Fordham, C. Foudas, A. Goussiou, R.J. Loveless, D.D. Reeder, S. Silverstein, W.H. Smith, T. Tsurugai, S. Bhadra, W.R. Frisken, and K.M. Furutani

Subjects
Nuclear and High Energy Physics, Particle physics, Proton, Nuclear physics, INELASTIC MUON SCATTERING, DEUTERON STRUCTURE FUNCTIONS, ZEUS, NUCLEON STRUCTURE FUNCTIONS, HIGH STATISTICS MEASUREMENT, PARTON DISTRIBUTIONS, LEADING ORDER, HIGH Q2, PERTURBATION-THEORY, SCALING VIOLATIONS, PP COLLISIONS, Quantum chromodynamics, Physics, ZEUS (particle detector), Neutral current, Scattering, High Energy Physics::Phenomenology, HERA, Gluon, High Energy Physics::Experiment, Perturbation theory (quantum mechanics)
Abstract

The gluon momentum density xg ( x , Q 2 ) of the proton was extracted at Q 2 = 20 GeV 2 for small values of x between 4 × 10 −4 and 10 −2 from the scaling violations of the proton structure function F 2 measured recently by ZEUS in deep inelastic neutral current ep scattering at HERA. The extraction was performed in two ways. Firstly, using a global NLO fit to the ZEUS data on F 2 at low x constrained by measurementsfrom NMC at larger x ; and secondly using published approximate methods for the solution of the GLAP QCD evolution equations. Consistent results are obtained. A substantial increase of the gluon density is found at small x in comparison with the NMC result obtained at larger values of x .

Published
2016

2. Observation of hard scattering in photoproduction events with a large rapidity gap at HERA

Author

M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, J. Schlereth, R. Stanek, R.L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, F. Frasconi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari, A. Polini, G. Sartorelli, R. Timellini, Y. Zamora Garcia, A. Zichichi, A. Bargende, J. Crittenden, K. Desch, B. Diekmann, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, G. Geitz, M. Grothe, H. Hartmann, D. Haun, K. Heinloth, E. Hilger, H.-P. Jakob, U.F. Katz, S.M. Mari, A. Mass, S. Mengel, J. Mollen, E. Paul, Ch. Rembser, R. Schattevoy, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, N. Dyce, B. Foster, S. George, R. Gilmore, G.P. Heath, H.F. Heath, T.J. Llewellyn, C.J.S. Morgado, D.J.P. Norman, J.A. O'Mara, R.J. Tapper, S.S. Wilson, R. Yoshida, R.R. Rau, M. Arneodo, L. Iannotti, M. Schioppa, G. Susinno, A. Bernstein, A. Caldwell, J.A. Parsons, S. Ritz, F. Sciulli, P.B. Straub, L. Wai, S. Yang, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, K. Piotrzkowski, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Eskreys, K. Jeleń, D. Kisielewska, T. Kowalski, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, A. Kotański, M. Przybycień, L.A.T. Bauerdick, U. Behrens, J.K. Bienlein, S. Böttcher, C. Coldewey, G. Drews, M. Flasiński, D.J. Gilkinson, P. Göttlicher, B. Gutjahr, T. Haas, W. Hain, D. Hasell, H. Heßling, H. Hultschig, Y. Iga, P. Joos, M. Kasemann, R. Klanner, W. Koch, L. Köpke, U. Kötz, H. Kowalski, W. Kröger, J. Krüger, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, O. Mańczak, J.S.T. Ng, S. Nickel, D. Notz, K. Ohrenberg, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, E. Stiliaris, T. Voß, D. Westphal, G. Wolf, C. Youngman, H.J. Grabosch, A. Leich, A. Meyer, C. Rethfeldt, S. Schlenstedt, G. Barbagli, P. Pelfer, G. Anzivino, G. Maccarrone, S. De Pasquale, S. Qian, L. Votano, A. Bamberger, A. Freidhof, T. Poser, S. Söldner-Rembold, J. Schroeder, G. Theisen, T. Trefzger, N.H. Brook, P.J. Bussey, A.T. Doyle, I. Fleck, V.A. Jamieson, D.H. Saxon, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, H. Kammerlocher, B. Krebs, T. Neumann, R. Sinkus, K. Wick, E. Badura, B.D. Burow, A. Fürtjes, L. Hagge, E. Lohrmann, J. Mainusch, J. Milewski, M. Nakahata, N. Pavel, G. Poelz, W. Schott, J. Terron, F. Zetsche, T.C. Bacon, R. Beuselinck, I. Butterworth, E. Gallo, V.L. Harris, B.H. Hung, K.R. Long, D.B. Miller, P.P.O. Morawitz, A. Prinias, J.K. Sedgbeer, A.F. Whitfield, U. Mallik, E. McCliment, M.Z. Wang, S.M. Wang, J.T. Wu, Y. Zhang, P. Cloth, D. Filges, S.H. An, S.M. Hong, S.W. Nam, S.K. Park, M.H. Suh, S.H. Yon, R. Imlay, S. Kartik, H.-J. Kim, R.R. McNeil, W. Metcalf, V.K. Nadendla, F. Barreiro, G. Cases, R. Graciani, J.M. Hernández, L. Hervás, L. Labarga, J. del Peso, J. Puga, J.F. de Trocóniz, G.R. Smith, F. Corriveau, D.S. Hanna, J. Hartmann, L.W. Hung, J.N. Lim, C.G. Matthews, P.M. Patel, L.E. Sinclair, D.G. Stairs, M.St. Laurent, R. Ullmann, G. Zacek, V. Bashkirov, B.A. Dolgoshein, A. Stifutkin, G.L. Bashindzhagyan, P.F. Ermolov, L.K. Gladilin, Y.A. Golubkov, V.D. Kobrin, V.A. Kuzmin, A.S. Proskuryakov, A.A. Savin, L.M. Shcheglova, A.N. Solomin, N.P. Zotov, S. Bentvelsen, M. Botje, F. Chlebana, A. Dake, J. Engelen, P. de Jong, M. de Kamps, P. Kooijman, A. Kruse, V. O'Dell, A. Tenner, H. Tiecke, W. Verkerke, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, K. Honscheid, C. Li, T.Y. Ling, K.W. McLean, W.N. Murray, I.H. Park, T.A. Romanowski, R. Seidlein, D.S. Bailey, G.A. Blair, A. Byrne, R.J. Cashmore, A.M. Cooper-Sarkar, D. Daniels, R.C.E. Devenish, N. Harnew, M. Lancaster, P.E. Luffman, L. Lindemann, J. McFall, C. Nath, A. Quadt, H. Uijterwaal, R. Walczak, F.F. Wilson, T. Yip, G. Abbiendi, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, J. Bulmahn, J.M. Butterworth, R.G. Feild, B.Y. Oh, J.J. Whitmore, G. D'Agostini, M. Iori, G. Marini, M. Mattioli, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, K. Prytz, T.P. Shah, T.L. Short, E. Barberis, N. Cartiglia, T. Dubbs, C. Heusch, M. Van Hook, B. Hubbard, W. Lockman, J.T. Rahn, H.F.-W. Sadrozinski, A. Seiden, J. Biltzinger, R.J. Seifert, A.H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, A. Levy, T. Hasegawa, M. Hazumi, T. Ishii, M. Kuze, S. Mine, Y. Nagasawa, T. Nagira, M. Nakao, I. Suzuki, K. Tokushuku, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, S. Nagayama, Y. Nakamitsu, R. Cirio, M. Costa, M.I. Ferrero, L. Lamberti, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D.C. Bailey, D. Bandyopadhyay, F. Benard, M. Brkic, M.B. Crombie, D.M. Gingrich, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, C.R. Sampson, R.J. Teuscher, C.D. Catterall, T.W. Jones, P.B. Kaziewicz, J.B. Lane, R.L. Saunders, J. Shulman, K. Blankenship, J. Kochocki, B. Lu, L.W. Mo, W. Bogusz, K. Charchuła, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Żarnecki, M. Adamus, Y. Eisenberg, C. Glasman, U. Karshon, D. Revel, A. Shapira, I. Ali, B. Behrens, S. Dasu, C. Fordham, C. Foudas, A. Goussiou, R.J. Loveless, D.D. Reeder, S. Silverstein, W.H. Smith, T. Tsurugai, S. Bhadra, W.R. Frisken, K.M. Furutani, and Zeus (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, Photon, Proton, Astrophysics::High Energy Astrophysical Phenomena, Hadron, FOS: Physical sciences, Astronomy & Astrophysics, DIFFRACTION, 01 natural sciences, High Energy Physics - Experiment, Physics, Particles & Fields, law.invention, COLLIDER, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics, DESIGN, law, 0103 physical sciences, Rapidity, CALORIMETER, Nuclear Experiment, 010306 general physics, Collider, DETECTOR, Physics, Research Groups and Centres\Physics\Low Temperature Physics, Science & Technology, ZEUS (particle detector), Faculty of Science\Physics, hep-ex, 010308 nuclear & particles physics, Scattering, ZEUS, diffractive scattering, HERA, photoproduction, Nuclear & Particles Physics, POMERON STRUCTURE, Physics, Nuclear, PHOTON, Physical Sciences, JETS, High Energy Physics::Experiment
Abstract

Events with a large rapidity gap and total transverse energy greater than 5 GeV have been observed in quasi-real photoproduction at HERA with the ZEUS detector. The distribution of these events as a function of the $\gamma p$ centre of mass energy is consistent with diffractive scattering. For total transverse energies above 12 GeV, the hadronic final states show predominantly a two-jet structure with each jet having a transverse energy greater than 4 GeV. For the two-jet events, little energy flow is found outside the jets. This observation is consistent with the hard scattering of a quasi-real photon with a colourless object in the proton., Comment: 19 pages, latex, 4 figures appended as uuencoded file

Published
1995

3. Measurement of elastic $\phi$ photoproduction at HERA

Author

M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J.R. Okrasinski, J. Repond, R. Stanek, R.L. Talaga, H. Zhang, M.C.K. Mattingly, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Polini, G. Sartorelli, Y. Zamora Garcia, A. Zichichi, A. Bornheim, J. Crittenden, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H.-P. Jakob, U.F. Katz, S. Mengel, J. Mollen, E. Paul, M. Pfeiffer, Ch. Rembser, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, W.N. Cottingham, N. Dyce, B. Foster, S. George, M.E. Hayes, G.P. Heath, H.F. Heath, D. Piccioni, D.G. Roff, R.J. Tapper, R. Yoshida, M. Arneodo, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno, A. Caldwell, N. Cartiglia, Z. Jing, W. Liu, J.A. Parsons, S. Ritz, F. Sciulli, P.B. Straub, L. Wai, S. Yang, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Jeleń, D. Kisielewska, T. Kowalski, M. Przybycień, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, A. Kotański, L.A.T. Bauerdick, U. Behrens, H. Beier, J.K. Bienlein, O. Deppe, K. Desler, G. Drews, M. Flasiński, D.J. Gilkinson, C. Glasman, P. Göttlicher, J. Große-Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K.F. Johnson, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Kötz, H. Kowalski, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, J. Mainusch, O. Mańczak, T. Monteiro, J.S.T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, T. Voß, D. Westphal, G. Wolf, C. Youngman, W. Zeuner, H.J. Grabosch, A. Kharchilava, S.M. Mari, A. Meyer, S. Schlenstedt, N. Wulff, G. Barbagli, E. Gallo, P. Pelfer, G. Maccarrone, S. De Pasquale, L. Votano, A. Bamberger, S. Eisenhardt, T. Trefzger, S. Wölfle, J.T. Bromley, N.H. Brook, P.J. Bussey, A.T. Doyle, D.H. Saxon, L.E. Sinclair, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, R. Sinkus, K. Wick, B.D. Burow, L. Hagge, E. Lohrmann, J. Milewski, N. Pavel, G. Poelz, W. Schott, F. Zetsche, T.C. Bacon, N. Brümmer, I. Butterworth, V.L. Harris, G. Howell, B.H.Y. Hung, L. Lamberti, K.R. Long, D.B. Miller, A. Prinias, J.K. Sedgbeer, D. Sideris, A.F. Whitfield, U. Mallik, M.Z. Wang, S.M. Wang, J.T. Wu, P. Cloth, D. Filges, S.H. An, G.H. Cho, B.J. Ko, S.B. Lee, S.W. Nam, H.S. Park, S.K. Park, S. Kartik, H.-J. Kim, R.R. McNeil, W. Metcalf, V.K. Nadendla, F. Barreiro, G. Cases, J.P. Fernandez, R. Graciani, J.M. Hernández, L. Hervás, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J.F. de Trocóniz, F. Corriveau, D.S. Hanna, J. Hartmann, L.W. Hung, J.N. Lim, C.G. Matthews, P.M. Patel, M. Riveline, D.G. Stairs, M. St-Laurent, R. Ullmann, G. Zacek, T. Tsurugai, V. Bashkirov, B.A. Dolgoshein, A. Stifutkin, G.L. Bashindzhagyan, P.F. Ermolov, L.K. Gladilin, Yu.A. Golubkov, V.D. Kobrin, I.A. Korzhavina, V.A. Kuzmin, O.Yu. Lukina, A.S. Proskuryakov, A.A. Savin, L.M. Shcheglova, A.N. Solomin, N.P. Zotov, M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, J. Gilmore, C. Li, T.Y. Ling, P. Nylander, I.H. Park, T.A. Romanowski, D.S. Bailey, R.J. Cashmore, A.M. Cooper-Sarkar, R.C.E. Devenish, N. Harnew, M. Lancaster, L. Lindemann, J.D. McFall, C. Nath, V.A. Noyes, A. Quadt, J.R. Tickner, H. Uijterwaal, R. Walczak, D.S. Waters, F.F. Wilson, T. Yip, G. Abbiendi, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin, J. Bulmahn, R.G. Feild, B.Y. Oh, J.J. Whitmore, G. D'Agostini, G. Marini, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, T.P. Shah, E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J.T. Rahn, H.F.-W. Sadrozinski, A. Seiden, D.C. Williams, J. Biltzinger, R.J. Seifert, O. Schwarzer, A.H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, A. Levy, J.I. Fleck, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, T. Matsushita, K. Yamauchi, R. Cirio, M. Costa, M.I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D.C. Bailey, F. Benard, M. Brkic, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, S. Polenz, C.R. Sampson, D. Simmons, R.J. Teuscher, J.M. Butterworth, C.D. Catterall, T.W. Jones, P.B. Kaziewicz, J.B. Lane, R.L. Saunders, J. Shulman, M.R. Sutton, B. Lu, L.W. Mo, W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Żarnecki, M. Adamus, C. Coldewey, Y. Eisenberg, U. Karshon, D. Revel, D. Zer-Zion, W.F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R.J. Loveless, S. Mattingly, D.D. Reeder, S. Silverstein, W.H. Smith, A. Vaiciulis, M. Wodarczyk, S. Bhadra, M.L. Cardy, C.-P. Fagerstroem, W.R. Frisken, M. Khakzad, W.N. Murray, W.B. Schmidke, and ZEUS at HERA (IHEF, IoP, FNWI)

Subjects
Diffraction, Nuclear and High Energy Physics, Particle physics, Meson, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, PHYSICS, Cross section (physics), DESIGN, 0103 physical sciences, 010306 general physics, DETECTOR, ZEUS, ZEUS BARREL CALORIMETER, CONSTRUCTION, Physics, Range (particle radiation), ZEUS (particle detector), 010308 nuclear & particles physics, HERA, Helicity, Exponential function, High Energy Physics::Experiment
Abstract

The production of $\phi$ mesons in the reaction $e^{+}p \rightarrow e^{+} \phi p$ ($\phi \rightarrow K^{+}K^{-}$) at a median $Q^{2}$ of $10^{-4} \ \rm{GeV^2}$ has been studied with the ZEUS detector at HERA. The differential $\phi$ photoproduction cross section $d\sigma/dt$ has an exponential shape and has been determined in the kinematic range $0.1, Comment: 23 pages, including 6 post script figures

Published
1996

4. Inclusive Jet Differential Cross Sections in Photoproduction at HERA

Author

Giuseppe Iacobucci, Y Zhang, S. Nickel, Antonino Zichichi, D. B. Miller, J. Gajewski, Douglas Gingrich, M. Basile, V. D. Kobrin, T. Dubbs, J. Biltzinger, P. Göttlicher, D. Haun, Giuseppe Levi, K. Jelen, W. Kröger, D. Acosta, Dg Stairs, G. Cases, J. Mollen, I. Butterworth, Y. Iga, Christian Nemoz, Cristiana Peroni, Y. Nakamitsu, Katsuo Tokushuku, R. J. Cashmore, N. Dyce, Fernando Barreiro, J.K. Mayer, A. Bertolin, K. Prytz, Luis Labarga, J. F. de Trocóniz, Umberto Dosselli, R. Ayad, C. Voci, S. Bhadra, M. Roco, D. J. Gilkinson, M. Derrick, W. Metcalf, Martin Utley, U. Holm, G.P. Heath, Krzysztof Piotrzkowski, Mauro Morandin, L. Zawiejski, Roberto Cirio, G. Cara Romeo, M. Brkic, Jose Repond, P. de Jong, T. Tymieniecka, K. Ohrenberg, Janusz Chwastowski, Jens Hartmann, G. D'Agostini, Thomas Trefzger, T. Doeker, L. W. Hung, Hartmut Sadrozinski, G. Geitz, Meng Wang, P. Giusti, G. Zacek, G. Drews, J. A. Parsons, T. Y. Ling, L. Lindemann, G. Zech, J.D. McFall, P.F. Ermolov, K. K. Joo, Giovanni Abbiendi, W. H. Smith, Mário Costa, W. Hain, B. Y. H. Hung, H.G.J.M. Tiecke, A. Bargende, A.H. Walenta, Robert Klanner, R. R. McNeil, E. A. De Wolf, U. Kötz, E. Tassi, U. F. Katz, J. Schlereth, F.S. Chlebana, P. Bruni, A. Cassidy, Costas Foudas, Ta Romanowski, K. Wick, Simon George, F. Benard, M. Rohde, Claudia Glasman, Marco Schioppa, K. Charchuła, A. Bruni, J. F. Martin, M. Löwe, Tachishige Hirose, C.J.S. Morgado, Michele Arneodo, A. Eskreys, P. G. Pelfer, L.W. Mo, Djp Norman, M.A.J. Botje, M. Iori, D. Revel, R. Stanek, E. Badura, S. Nagayama, B. Musgrave, Luca Stanco, F. F. Wilson, A. Meyer, T. Yip, M. Chiarini, M. Kuze, V. O'Dell, O. Mańczak, G. F. Hartner, J. J. Whitmore, R. Seidlein, J. K. Bienlein, B.D. Burrow, P. Cloth, R. Imlay, M. Nakahata, M. St.Laurent, Guenter Wolf, A. Bernstein, Y. Zamora Garcia, T. Voß, P. Morawitz, A. Caldwell, F. Palmonari, F. Ikraiam, A. Mass, J. K. Sedgbeer, J. Kochocki, F. Frasconi, V. K. Nadendla, Jonathan Butterworth, Lucia Votano, C. Nath, I. Gialas, H. Heßling, A. A. Savin, L. Wai, Amedeo Staiano, S. Magill, J. Schroeder, L. Suszycki, Marcel Vreeswijk, Andrea Contin, G. Bruni, A. Kruse, R. Loveless, R. Stroili, R. J. Nowak, D. Schramm, C. A. Heusch, Cg Matthews, E. Paul, C. Fordham, Ulf Behrens, Federico Cindolo, W. Bogusz, H. Kowalski, K.W. McLean, A. Ladage, M. Zachara, F. Ciralli, Leszek Adamczyk, J. Del Peso, A. Shapira, F. J. Sciulli, S. Söldner-Rembold, E. Lohrmann, Y. Eisenberg, L.E. Sinclair, F. Dal Corso, K. Homma, T. Hasegawa, M.I. Ferrero, A. Freidhof, R. Graciani, Matthias Kasemann, T. Poser, A. Stifutkin, M. Lancaster, R. G. Feild, A. Leich, B. Lu, J.T. Wu, M.B. Crombie, K.M. Furutani, I. Ali, D. Notz, Vladimir Bashkirov, R. Walczak, B. Ladage, W.N. Murray, G. Anzivino, L. Bellagamba, S. H. Yon, James Crittenden, Aleksander Filip Żarnecki, Silvia Maselli, K. Heinloth, D. S. Bailey, J. Zaja̧c, T. W. Jones, Anna Goussiou, W. Schulz, Debades Bandyopadhyay, A. Nigro, L. S. Durkin, G. Grzelak, Giuseppe Barbagli, D. Daniels, G. L. Bashindzhagyan, N. P. Zotov, R. J. Teuscher, T. C. Bacon, M. Nakao, P. Borzemski, A.S. Wilson, E. Barberis, Helen F Heath, Wr Frisken, T.L. Short, Efstathios Stiliaris, A. N. Solomin, M. Geerts, K. Blankenship, G. Briskin, A Furtjes, M. Grothe, R.J. Tapper, D. Horstmann, R. Timellini, A. Dake, N. H. Brook, U. Mallik, E. Rulikowska-Zarȩbska, A.F. Whitfield, S.M. Mari, L. Hagge, R. S. Orr, M. de Kamps, S. Qian, H. J. Kim, S. Mine, P. B. Straub, I. H. Park, Ben Bylsma, J. Milewski, Giovanni Maccarrone, V. L. Harris, I. Fleck, S. Schlenstedt, P. J. Bussey, Kenneth Long, R. Hamatsu, B. Behrens, J. Puga, H. Hartmann, Yasunori Yamazaki, D. Krakauer, Danuta Kisielewska, G. Bari, T. Massam, S. M. Hong, C.R. Sampson, Jose M Hernandez, H. Hultschig, Stan Bentvelsen, C. Youngman, M. Van Hook, V.A. Jamieson, B. Bednarek, M. Mattioli, R. Beuselinck, Jeffrey T. Rahn, Sridhara Dasu, Lothar At Bauerdick, R. L. Talaga, S Campbell-Robson, Halina Abramowicz, T. Ishii, J. F. Labs, B. Löhr, H. Kammerlocher, G. Sartorelli, John Hart, F. Zetsche, J. L. Thron, P. Joos, J. Stamm, B. Foster, Roberto Carlin, Luisa Cifarelli, L. K. Gladilin, Neville Harnew, P. M. Patel, Samuel Silverstein, S. Böttcher, A. Prinias, J. Ciborowski, R. Ullmann, S.H. An, M. Dardo, C. Coldewey, B. Krebs, D. Lüke, A. Polini, M. H. Suh, B. Gutjahr, Y. Nagasawa, U. Schneekloth, W. Koch, J. A. Zakrzewski, Amanda Cooper-Sarkar, Nicolo Cartiglia, M. Adamus, J.B. Lane, T. Neumann, G. Marini, T. Tsurugai, S. Yang, Masashi Hazumi, F. Arzarello, R. J. Seifert, Rr Rau, A. Quadt, R.S. Gilmore, C. Rembser, N. A. McCubbin, A.K. Wróblewski, A. Bamberger, L. Köpke, J.A. O'Mara, H.J. Grabosch, Mariusz Flasiński, S. Dagan, S. Kitamura, Tadeusz Kowalski, S.S. Wilson, F. Selonke, E. Hilger, A. Byrne, K. Honscheid, Yu. A. Golubkov, M. Krzyżanowski, S. Kartik, D.D. Reeder, G. Poelz, Lutz Feld, J. Roldán, A.S. Proskuryakov, B.Y. Oh, R. van Woudenberg, M Eckart, B. Diekmann, Francois Corriveau, C. Li, Detlef Filges, M. Posocco, Geoffrey Smith, A. Kotański, P.M. Kooijman, D. K. Hasell, E. Gallo, J. Shulman, Tobias M. Haas, Juan Terron, M. Kasprzak, Ada Solano, Shoichi Yamada, R.C.E. Devenish, S. Limentani, P. B. Kaziewicz, L. Lamberti, H. Uijterwaal, G.A. Blair, G. Laurenti, S. Mengel, J. Mainusch, C. Rethfeldt, W. Schott, Cd Catterall, L. Iannotti, H.-P. Jakob, R. L. Saunders, R. Brugnera, V. A. Kuzmin, D. C. Bailey, M. De Giorgi, Gm Levman, S. De Paspuale, E. McCliment, N. Pavel, I. Suzuki, Rosario Nania, Sung Keun Park, William S. Lockman, A. Seiden, A. Dannemann, M. Przybycień, A. T. Doyle, J. Bulmahn, A.G. Tenner, Wouter Verkerke, R. Schattevoy, R. Yoshida, B. A. Dolgoshein, T. Kȩdzierski, T. Nagira, Roberto Sacchi, B. Hubbard, J. M. Pawlak, Aharon Levy, T.J. Llewellyn, J. N. Lim, R. Sinkus, J.-L. Schneider, K. Muchorowski, P. Luffman, A. Frey, R. Wedemeyer, K. Eskreys, T.P. Shah, S. M. Wang, D. H. Saxon, Masami Chiba, Klaus Kurt Desch, S. W. Nam, J.J. Engelen, S. Ritz, D. S. Hanna, Anselmo Margotti, L.W. Wiggers, D. Westphal, G. Theisen, U. Karshon, Luis Hervas, D. Boscherini, G. Susinno, Saverio D'Auria, G. Castellini, J.S.T. Ng, L. M. Shcheglova, and Zeus (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, Photon, Logarithm, LUND MONTE-CARLO, Monte Carlo method, Hadron, Parton, 01 natural sciences, 7. Clean energy, EVENTS, COLLIDER, Nuclear physics, 0103 physical sciences, photoproduction, differential cross section, CALORIMETER, 010306 general physics, Parton shower, Nuclear Experiment, Physics, E+E-PHYSICS, 010308 nuclear & particles physics, ZEUS, LEADING-ORDER QCD, HERA, PHOTON, DIFFRACTIVE HARD SCATTERING, PARTON DISTRIBUTIONS, FRAGMENTATION, High Energy Physics::Experiment
Abstract

Inclusive jet differential cross sections for the reaction ep → jet + X at Q2 below 4 GeV2 have been measured with the ZEUS detector at HERA using an integrated luminosity of 0.55 pb-1. These cross sections are given in the kinematic region 0.2 < y < 0.85, for jet pseudorapidities in the ep-laboratory range -1 < ηjet < 2 and refer to jets at the hadron level with a cone radius of one unit in the η - φ plane. These results correspond to quasi-real photoproduction at centre-of-mass energies in the range 130-270 GeV and, approximately, for jet pseudorapidities in the interval -3 < ηjet(γρ CMS) < 0. These measurements cover a new kinematic regime of the partonic structure of the photon, at typical scales up to ∼300 GeV2 and photon fractional momenta down to xγ ∼ 10-2. Leading logarithm parton shower Monte Carlo calculations, which include both resolved and direct processes and use the predictions of currently available parametrisations of the photon parton distributions, describe in general the shape and magnitude of the measured ηjet and ETjet distributions.

Published
1995

5. Exclusive \(\rho^{0}\) production in deep inelastic electron-proton scattering at HERA

Author

K. K. Joo, M. Martinez, J. F. Martin, A. Nigro, T. Yip, O. Mańczak, G. F. Hartner, A.F. Whitfield, S.M. Mari, A. Eskreys, Djp Norman, D. Westphal, Guenter Wolf, A. Bernstein, J. T. Rahn, U. Karshon, Y. Zamora Garcia, T. Voß, M.A.J. Botje, Thomas Trefzger, Luis Hervas, Andrea Contin, A. Kruse, D. Boscherini, G. Susinno, T. Monteiro, Detlef Filges, L. M. Shcheglova, Marcella Capua, G. Castellini, P.M. Kooijman, D. K. Hasell, Antonino Zichichi, F. Palmonari, N. Cartiglia, E. Gallo, A. Prinias, W. Koch, Roberto Sacchi, H.G.J.M. Tiecke, F. Benard, J.S.T. Ng, B. Löhr, P. Joos, J. Stamm, P. Bruni, Costas Foudas, B. Foster, Ta Romanowski, J. Shulman, Claudia Glasman, Giuseppe Iacobucci, Luisa Cifarelli, L. K. Gladilin, Neville Harnew, Amedeo Staiano, Danuta Kisielewska, R. Yoshida, L.W. Mo, R. Stanek, H. Beier, Tadeusz Kowalski, Juan Terron, M. Kasprzak, M. Pfeiffer, T. Massam, C. Youngman, Aharon Levy, T.J. Llewellyn, J. N. Lim, S. Dagan, R. Graciani, E. Badura, R. S. Orr, K. Honscheid, Yu. A. Golubkov, C. P. Fagerstroem, G. Poelz, Lutz Feld, R. Sinkus, Cristiana Peroni, R. J. Cashmore, Luis Labarga, Luca Stanco, E. Rulikowska-Zarȩbska, S. Mine, B. Lu, Ada Solano, Cg Matthews, A. Caldwell, G. Cases, H.-P. Jakob, Lothar At Bauerdick, F. F. Wilson, M. Chiarini, Yasunori Yamazaki, J. M. Pawlak, P. B. Straub, Kenneth Long, R. L. Saunders, M. Derrick, T. Tymieniecka, J. K. Sedgbeer, S. Limentani, M. Posocco, Geoffrey Smith, Tobias M. Haas, Jonathan Butterworth, John Hart, B. Behrens, G. Bruni, G. Bari, K.W. McLean, A. Ladage, U. Kötz, J.B. Lane, S. Söldner-Rembold, Jens Hartmann, R. Loveless, R. Brugnera, S. W. Nam, Shoichi Yamada, R.C.E. Devenish, F. J. Sciulli, Simon George, A. Frey, D. Krakauer, V. A. Kuzmin, D. C. Bailey, A. Bertolin, M. Van Hook, B. Bednarek, Rr Rau, O. Yu. Lukina, V. K. Nadendla, L. Köpke, J.A. O'Mara, M. Geerts, K. Blankenship, M. L. Utley, J.J. Engelen, M. Eckert, L. Bellagamba, A. Garfagnini, R. R. McNeil, G. Laurenti, S. Nickel, R. J. Nowak, F. Zetsche, C.R. Sampson, K. Muchorowski, Tachishige Hirose, M. De Giorgi, D. B. Miller, J. Gajewski, T.P. Shah, S. M. Wang, P. M. Patel, Lucia Votano, S. Ritz, D. S. Hanna, Y. Nagasawa, C. Nath, H. Heßling, J. F. de Trocóniz, Anselmo Margotti, D. J. Gilkinson, L. Zawiejski, D. H. Saxon, A. Freidhof, M. Khakzad, Roberto Cirio, K.F. Johnson, P. Giusti, L.W. Wiggers, L. Iannotti, J. K. Bienlein, F. Selonke, E. Hilger, V.A. Noyes, M. Basile, R. Wedemeyer, Giuseppe Levi, J. A. Zakrzewski, Douglas Gingrich, Gm Levman, D. S. Waters, V. D. Kobrin, T. Dubbs, J. Biltzinger, Ulf Behrens, Federico Cindolo, W. Bogusz, H. Kowalski, G. Zacek, S. Kartik, G. Drews, J. A. Parsons, W. Hain, M. Krzyżanowski, C. Fordham, M. Kuze, Y. Nakamitsu, Rosario Nania, Sung Keun Park, Katsuo Tokushuku, Masashi Hazumi, C. Rembser, N. A. McCubbin, S. Polenz, S. Mengel, Francois Corriveau, J. Mainusch, E. McCliment, W. Metcalf, K. Jelen, M. Rohde, K. Wick, K. Yamauchi, B. Musgrave, M. Zachara, M. St.Laurent, U. Holm, J. M. Hernandez, G.P. Heath, K. Charchuła, B.Y. Oh, A. Bruni, Umberto Dosselli, Janusz Chwastowski, A. Kotański, M. Brkic, A. Dannemann, A. Seiden, N. Wulff, M. Przybycień, A.H. Walenta, Masami Chiba, Klaus Kurt Desch, G. D'Agostini, E. Paul, Avto Kharchilava, C. Li, Christian Nemoz, W. Schott, J. Roldán, James Crittenden, N. Dyce, E. A. De Wolf, J. R. Tickner, Cd Catterall, T. Ishii, B. D. Burow, T. Y. Ling, A. T. Doyle, L. Wai, L. Lindemann, Wouter Verkerke, A. Stifutkin, E. Barberis, G. Zech, P. Morawitz, N. Pavel, I. Suzuki, B. A. Dolgoshein, R. Stroili, Giovanni Abbiendi, A.S. Proskuryakov, Robert Klanner, Lars Hagge, W.N. Murray, G. Anzivino, M. Lancaster, A. Vaiciulis, C. Voci, R. van Woudenberg, M. Löwe, J.T. Wu, J. Bulmahn, A. N. Solomin, B. Surrow, S. Bhadra, T.L. Short, Efstathios Stiliaris, M. Nakao, P. Borzemski, U. Mallik, J. P. Fernandez, D. C. Williams, Aleksander Filip Żarnecki, Silvia Maselli, Y. Eisenberg, William S. Lockman, J. Ciborowski, R. Ullmann, M.C.K. Mattingly, L. S. Durkin, T. Doeker, A.S. Wilson, S.H. An, M. Grothe, B. Gutjahr, R.J. Tapper, M. de Kamps, W. B. Schmidke, K. Heinloth, R. Hamatsu, Giuseppe Barbagli, I. Ali, V.A. Kurzhavina, D.D. Reeder, B. Diekmann, M. Wodarczyk, M. Dardo, C. Coldewey, J. Puga, H. J. Kim, A. Cassidy, Giovanni Maccarrone, D. Horstmann, R. Timellini, A. Dake, N. H. Brook, J. Große-Knetter, D. S. Bailey, V. L. Harris, M. Nakahata, M. Veeswijk, M. Adamus, O. Schwarzer, Helen F Heath, Wr Frisken, I. A. Korzhavina, I. Butterworth, Roman Walczak, D. Lüke, Y. Iga, A. Polini, G. Marini, S. Schlenstedt, P. J. Bussey, Fernando Barreiro, D. Acosta, Dg Stairs, T. Tsurugai, G. Sartorelli, Np Zotov, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, Krzysztof Piotrzkowski, M. H. Suh, Mauro Morandin, U. Schneekloth, Marco Schioppa, J. J. Whitmore, P. G. Pelfer, J.I. Fleck, T. Neumann, D. Schramm, C. A. Heusch, Mariusz Flasiński, L. W. Hung, S. Kitamura, A. Byrne, R. Seidlein, K. Prytz, P. B. Kaziewicz, M. Corradi, S. Yang, L. Lamberti, D. Mikunas, J. Zaja̧c, A. Bargende, E. Tassi, R. Ayad, M. Roco, H. Uijterwaal, G. Cara Romeo, R.S. Gilmore, H.J. Grabosch, U. F. Katz, J. F. Labs, M. L. Cardy, J.F. Zhou, E. Lohrmann, O. Deppe, B. Y. H. Hung, D. Revel, A. Meyer, Roberto Carlin, S.S. Wilson, K.M. Furutani, W. Schulz, J. Del Peso, L.E. Sinclair, K. Homma, G. Briskin, Q. Zhu, Vladimir Bashkirov, Jose Repond, K. Ohrenberg, N. Bruemmer, Meng Wang, G. Grzelak, W. H. Smith, T. C. Bacon, Mário Costa, S. De Pasquale, F.S. Chlebana, I. Gialas, J. Schroeder, Leszek Adamczyk, M.I. Ferrero, R. G. Feild, Matthias Kasemann, P. Göttlicher, D. Notz, K. Desler, S. H. Yon, T. W. Jones, Anna Goussiou, G. L. Bashindzhagyan, R. J. Teuscher, Hartmut Sadrozinski, I. H. Park, Ben Bylsma, Hao Zhang, J. Milewski, H. Hartmann, Sridhara Dasu, S. Eisenhardt, S Campbell-Robson, Halina Abramowicz, J.D. McFall, P.F. Ermolov, D. Zer-Zion, P. Cloth, R. Imlay, S. Magill, F. Dal Corso, T. Hasegawa, A. Leich, W.F. Badgett, Debades Bandyopadhyay, S. M. Hong, R. L. Talaga, C.J.S. Morgado, Michele Arneodo, A. A. Savin, L. Suszycki, Samuel Silverstein, Amanda Cooper-Sarkar, R. J. Seifert, A. Quadt, J. Mollen, and Zeus (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, Meson, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Pomeron, Cross section (physics), 0103 physical sciences, photoproduction, cross section measurement, 010306 general physics, DETECTOR, Physics, Quantum chromodynamics, Research Groups and Centres\Physics\Low Temperature Physics, 010308 nuclear & particles physics, Scattering, Faculty of Science\Physics, Perturbative QCD, ELECTROPRODUCTION, ZEUS, HERA, QCD, Gluon, High Energy Physics::Experiment
Abstract

The exclusive production of $\rho^0$ mesons in deep inelastic electron-proton scattering has been studied using the ZEUS detector. Cross sections have been measured in the range $7 < Q^2 < 25$ GeV$^2$ for $\gamma^*p$ centre of mass (c.m.) energies from 40 to 130 GeV. The $\gamma^*p \to \rho^0 p$ cross section exhibits a $Q^{-(4.2 \pm 0.8 ^{+1.4}_{-0.5})}$ dependence and both longitudinally and transversely polarised $\rho^0$'s are observed. The $\gamma^*p \to \rho^0 p$ cross section rises strongly with increasing c.m. energy, when compared with NMC data at lower energy, which cannot be explained by production through soft pomeron exchange. The data are compared with perturbative QCD calculations where the rise in the cross section reflects the increase in the gluon density at low $x$. the gluon density at low $x$., Comment: 22 pages, latex, 4 figures appended

Published
1995

6. Measurement of the reaction γ*p→φp in deep inelastic e+p scattering at HERA

Author

M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J.R. Okrasinski, J. Repond, R. Stanek, R.L. Talaga, H. Zhang, M.C.K. Mattingly, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Polini, G. Sartorelli, Y.Zamora Garcia, A. Zichichi, C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H.-P. Jakob, U.F. Katz, S. Mengel, E. Paul, M. Pfeiffer, Ch. Rembser, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, W.N. Cottingham, N. Dyce, B. Foster, S. George, M.E. Hayes, G.P. Heath, H.F. Heath, D. Piccioni, D.G. Roff, R.J. Tapper, R. Yoshida, M. Arneodo, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno, A. Caldwell, N. Cartiglia, Z. Jing, W. Liu, J.A. Parsons, S. Ritz, F. Sciulli, P.B. Straub, L. Wai, S. Yang, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M.B. Przybycień, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Jeleń, D. Kisielewska, T. Kowalski, M. Przybycień, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, Z. Duliński, A. Kotański, G. Abbiendi, L.A.T. Bauerdick, U. Behrens, H. Beier, J.K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasiński, D.J. Gilkinson, C. Glasman, P. Göttlicher, J. Große-Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K.F. Johnson, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Kötz, H. Kowalski, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, J. Mainusch, O. Mańczak, J. Milewski, T. Monteiro, J.S.T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner, H.J. Grabosch, A. Kharchilava, S.M. Mari, A. Meyer, S. Schlenstedt, N. Wulff, G. Barbagli, E. Gallo, P. Pelfer, G. Maccarrone, S. De Pasquale, L. Votano, A. Bamberger, S. Eisenhardt, T. Trefzger, S. Wölfle, J.T. Bromley, N.H. Brook, P.J. Bussey, A.T. Doyle, D.H. Saxon, L.E. Sinclair, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, R. Sinkus, K. Wick, B.D. Burow, L. Hagge, E. Lohrmann, N. Pavel, G. Poelz, W. Schott, F. Zetsche, T.C. Bacon, N. Brümmer, I. Butterworth, V.L. Harris, G. Howell, B.H.Y. Hung, L. Lamberti, K.R. Long, D.B. Miller, A. Prinias, J.K. Sedgbeer, D. Sideris, A.F. Whitfield, U. Mallik, M.Z. Wang, S.M. Wang, J.T. Wu, P. Cloth, D. Filges, S.H. An, G.H. Cho, B.J. Ko, S.B. Lee, S.W. Nam, H.S. Park, S.K. Park, S. Kartik, H.-J. Kim, R.R. McNeil, W. Metcalf, V.K. Nadendla, F. Barreiro, J.P. Fernandez, R. Graciani, J.M. Hernández, L. Hervás, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J.F. de Trocóniz, F. Corriveau, D.S. Hanna, J. Hartmann, L.W. Hung, J.N. Lim, C.G. Matthews, P.M. Patel, M. Riveline, D.G. Stairs, M. St-Laurent, R. Ullmann, G. Zacek, T. Tsurugai, V. Bashkirov, B.A. Dolgoshein, A. Stifutkin, G.L. Bashindzhagyan, P.F. Ermolov, L.K. Gladilin, Yu.A. Golubkov, V.D. Kobrin, I.A. Korzhavina, V.A. Kuzmin, O.Yu. Lukina, A.S. Proskuryakov, A.A. Savin, L.M. Shcheglova, A.N. Solomin, N.P. Zotov, M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, J. Gilmore, C. Li, T.Y. Ling, P. Nylander, I.H. Park, T.A. Romanowski, D.S. Bailey, R.J. Cashmore, A.M. Cooper-Sarkar, R.C.E. Devenish, N. Harnew, M. Lancaster, L. Lindemann, J.D. McFall, C. Nath, V.A. Noyes, A. Quadt, J.R. Tickner, H. Uijterwaal, R. Walczak, D.S. Waters, F.F. Wilson, T. Yip, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin, J. Bulmahn, R.G. Feild, B.Y. Oh, J.J. Whitmore, G. D'Agostini, G. Marini, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, T.P. Shah, E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J.T. Rahn, H.F.-W. Sadrozinski, A. Seiden, D.C. Williams, J. Biltzinger, R.J. Seifert, O. Schwarzer, A.H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, A. Levy, J.I. Fleck, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, T. Matsushita, K. Yamauchi, R. Cirio, M. Costa, M.I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D.C. Bailey, F. Benard, M. Brkic, C.-P. Fagerstroem, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, S. Polenz, C.R. Sampson, D. Simmons, R.J. Teuscher, J.M. Butterworth, C.D. Catterall, T.W. Jones, P.B. Kaziewicz, J.B. Lane, R.L. Saunders, J. Shulman, M.R. Sutton, B. Lu, L.W. Mo, W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Żarnecki, M. Adamus, C. Coldewey, Y. Eisenberg, D. Hochman, U. Karshon, D. Revel, D. Zer-Zion, W.F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R.J. Loveless, S. Mattingly, D.D. Reeder, S. Silverstein, W.H. Smith, A. Vaiciulis, M. Wodarczyk, S. Bhadra, M.L. Cardy, W.R. Frisken, M. Khakzad, W.N. Murray, and W.B. Schmidke

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Proton, 010308 nuclear & particles physics, Perturbative QCD, HERA, 7. Clean energy, 01 natural sciences, Zeus (malware), Gluon, Nuclear physics, Pomeron, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

The production of φ mesons in the reaction e+p → e+φp (φ → K+K−), for 7 Q 2 GeV 2 and virtual photon-proton centre of mass energies (W) in the range 42–134 GeV, has been studied with the ZEUS detector at HERA. When compared to lower energy data at similar Q 2, the results show that the γ ∗ p → φp cross section rises strongly with W. This behaviour is similar to that previously found for the γ ∗ p → ϱ 0 p cross section. This strong dependence cannot be explained by production through soft pomeron exchange. It is, however, consistent with perturbative QCD expectations, where it reflects the rise of the gluon momentum density in the proton at small x. The ratio of σ(φ) σ(ϱ 0 ) , which has previously been determined by ZEUS to be 0.065 ± 0.013 (stat.) in photoproduction at a mean W of 70 GeV, is measured to be 0.18 ± 0.05 (stat.) ± 0.03 (syst.) at a mean Q 2 of 12.3 GeV2 and mean W of ≈ 100 GeV and is thus approaching at large Q 2 the value of 2 9 predicted from the quark charges of the vector mesons and a flavour independent production mechanism.

7. The use of RPC in the ARGO-YBJ project

Author

C. Bacci, K.Z. Bao, F. Barone, B. Bartoli, D. Bastieri, P. Bernardini, S. Bussino, E. Calloni, B.Y. Cao, R. Cardarelli, S. Catalanotti, A. Cavaliere, F. Cesaroni, P. Creti, null Danzengluobu, B. D'Ettorre Piazzoli, M. De Vincenzi, T. Di Girolamo, G. Di Sciascio, Z.Y. Feng, Y. Fu, X.Y. Gao, Q.X. Geng, H.W. Guo, Q. Huang, H.H. He, M. He, M. Iacovacci, N. Iucci, H.Y. Jai, F.M. Kong, H.H. Kuang, null Labaciren, B. Li, J.Y. Li, Z.Q. Liu, H. Lu, X.H. Ma, C. Marmolino, G. Mancarella, S.M. Mari, D. Martello, G. Marsella, D.M. Mei, X.R. Meng, A. Morselli, L. Milano, J. Mu, M. Oliviero, P. Padovani, M. Panareo, M. Parisi, Z.R. Peng, P. Pistilli, R. Santonico, G. Sartori, C. Sbarra, G. Severino, R. Sparvoli, C. Stanescu, M. Storini, P.R. Shen, L.R. Sun, S.C. Sun, J. Su, A. Surdo, Y.H. Tan, S. Vernetto, M. Vietri, C.R. Wang, F. Wang, H.Y. Wang, Y.N. Wei, H.T. Yang, W.K. Yao, G.C. Yu, A.F. Yuan, X.D. Yue, H.M. Zhang, J.L. Zhang, N.J. Zhang, T.J. Zhang, X.Y. Zhang, null Zhaxiciren, null Zhaxisangzhu, Q.Q. Zhu, Bacci, C, Bao, Kz, Barone, F, Bartoli, B, Bastieri, D, Bernardini, P, Bussino, S, Calloni, E, Cao, By, Cardarelli, R, Catalanotti, S, Cavaliere, A, Cesaroni, F, Creti, P, Danzengluobu, Piazzoli, Bd, DE VINCENZI, M, DI GIROLAMO, T, DI SCIASCIO, G, Feng, Zy, Fu, Y, Gao, Xy, Geng, Qx, Guo, Hw, Huang, Q, He, Hh, He, M, Iacovacci, M, Iucci, N, Jai, Hy, Kong, Fm, Kuang, Hh, Labaciren, Li, B, Li, Jy, Liu, Zq, Lu, H, Ma, Xh, Marmolino, C, Mancarella, G, Mari, Sm, Martello, Daniele, Marsella, Giovanni, Mei, Dm, Meng, Xr, Morselli, A, Milano, L, Mu, J, Oliviero, M, Padovani, P, Panareo, Marco, Parisi, M, Peng, Zr, Pistilli, P, Santonico, R, Sartori, G, Sbarra, C, Severino, G, Sparvoli, R, Stanescu, C, Storini, M, Shen, Pr, Sun, Lr, Sun, Sc, Su, J, Surdo, A, Tan, Yh, Vernetto, S, Vietri, M, Wang, Cr, Wang, F, Wang, Hy, Wei, Yn, Yang, Ht, Yao, Qk, Yu, Gc, Yuan, Af, Yue, Xd, Zhang, Hm, Zhang, Jl, Zhang, Nj, Zhang, Tj, Zhang, Xy, Zhaxiciren, Zhaxisangzhu, Zhu, Qq, C., Bacci1, K. Z., Bao2, F., Barone3, B., Bartoli3, D., Bastieri4, P., Bernardini5, R., Buonomo3, Bussino, Severino Angelo Maria, E., Calloni3, B. Y., Cao6, R., Cardarelli7, S., Catalanotti3, A., Cavaliere7, F., Cesaroni5, P., Creti5, Danzengluobu8, B., D'Ettorre Piazzoli3, M., De Vincenzi1, T., Di Girolamo3, G., Di Sciascio3, Z. Y., Feng9, Y., Fu6, X. Y., Gao10, Q. X., Geng10, H. W., Guo8, H. H., He11, M., He6, Q., Huang9, M., Iacovacci3, N., Iucci1, H. Y., Jai9, F. M., Kong6, H. H., Kuang11, Labaciren8, B., Li2, J. Y., Li6, Z. Q., Liu10, H., Lu11, X. H., Ma11, G., Mancarella5, Mari, Stefano Maria, G., Marsella5, D., Martello5, D. M., Mei8, X. R., Meng8, L., Milano3, A., Morselli7, J., Mu10, M., Oliviero13, P., Padovani7, M., Panareo5, M., Parisi1, G., Pellizzoni1, Z. R., Peng11, P., Pistilli1, R., Santonico7, G., Sartori4, C., Sbarra4, G., Severino13, P. R., Shen11, R., Sparvoli7, C., Stanescu1, J., Su11, L. R., Sun2, S. C., Sun2, A., Surdo5, Y. H., Tan11, S., Vernetto14, M., Vietri1, C. R., Wang6, H., Wang11, H. Y., Wang11, Y. N., Wei2, H. T., Yang12, Q. K., Yao2, G. C., Yu9, X. D., Yue2, A. F., Yuan8, H. M., Zhang11, J. L., Zhang11, N. J., Zhang6, T. J., Zhang10, X. Y., Zhang6, Zhaxisangzhu8, Zhaxiciren8, Q. Q., Zhu11, C., Bacci, K. Z., Bao, F., Barone, Bartoli, Bruno, D., Bastieri, P., Bernardini, S., Bussino, Calloni, Enrico, B. Y., Cao, R., Cardarelli, Catalanotti, Sergio, A., Cavaliere, F., Cesaroni, P., Creti, D'ETTORRE PIAZZOLI, Benedetto, M. D., Vincenzi, DI GIROLAMO, Tristano, G. D., Sciascio, Z. Y., Feng, Y., Fu, X. Y., Gao, Q. X., Geng, H. W., Guo, Q., Huang, H. H., He, M., He, Iacovacci, Michele, N., Iucci, H. Y., Jai, F. M., Kong, H. H., Kuang, B., Li, J. Y., Li, Z. Q., Liu, H., Lu, X. H., Ma, C., Marmolino, G., Mancarella, S. M., Mari, D., Martello, G., Marsella, D. M., Mei, X. R., Meng, A., Morselli, L., Milano, J., Mu, M., Oliviero, P., Padovani, M., Panareo, M., Parisi, Z. R., Peng, P., Pistilli, R., Santonico, G., Sartori, C., Sbarra, G., Severino, R., Sparvoli, C., Stanescu, M., Storini, P. R., Shen, L. R., Sun, S. C., Sun, J., Su, A., Surdo, Y. H., Tan, S., Vernetto, M., Vietri, C. R., Wang, F., Wang, H. Y., Wang, Y. N., Wei, H. T., Yang, Q. K., Yao, G. C., Yu, A. F., Yuan, X. D., Yue, H. M., Zhang, J. L., Zhang, N. J., Zhang, T. J., Zhang, X. Y., Zhang, Q. Q., Zhu, B., Bartoli, Bernardini, Paolo, E., Calloni, S., Catalanotti, B., D'ETTORRE PIAZZOLI, M., DE VINCENZI, T., DI GIROLAMO, G., DI SCIASCIO, M., Iacovacci, and Mancarella, Giovanni

Subjects
Nuclear and High Energy Physics, Computer science, Detector, Real-time computing, Full coverage, Atomic and Molecular Physics, and Optics, Argo
Abstract

We present the ARGO-YBJ experiment, a full coverage detector placed at high altitude (similar to 4300 m a.s.l.) that exploits the RPC technique. Results of a test experiment performed at Yanbajing site, with a full coverage RPC carpet of 50 m(2) are also presented.

8. Dijet angular distributions in direct and resolved photoproduction at HERA

Author

M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J.R. Okrasinski, J. Repond, R. Stanek, R.L. Talaga, H. Zhang, M.C.K. Mattingly, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Polini, G. Sartorelli, Y. Zamora Garcia, A. Zichichi, C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H.-P. Jakob, U.F. Katz, S. Mengel, E. Paul, M. Pfeiffer, Ch. Rembser, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, W.N. Cottingham, N. Dyce, B. Foster, S. George, M.E. Hayes, G.P. Heath, H.F. Heath, D. Piccioni, D.G. Roff, R.J. Tapper, R. Yoshida, M. Arneodo, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno, A. Caldwell, N. Cartiglia, Z. Jing, W. Liu, J.A. Parsons, S. Ritz, F. Sciulli, P.B. Straub, L. Wai, S. Yang, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M.B. Przybycień, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Jeleń, D. Kisielewska, T. Kowalski, M. Przybycień, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, Z. Duliński, A. Kotański, G. Abbiendi, L.A.T. Bauerdick, U. Behrens, H. Beier, J.K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasiński, D.J. Gilkinson, C. Glasman, P. Göttlicher, J. Große-Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K.F. Johnson, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Kötz, H. Kowalski, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, J. Mainusch, O. Mańczak, J. Milewski, T. Monteiro, J.S.T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner, H.J. Grabosch, A. Kharchilava, S.M. Mari, A. Meyer, S. Schlenstedt, N. Wulff, G. Barbagli, E. Gallo, P. Pelfer, G. Maccarrone, S. De Pasquale, L. Votano, A. Bamberger, S. Eisenhardt, T. Trefzger, S. Wölfle, J.T. Bromley, N.H. Brook, P.J. Bussey, A.T. Doyle, D.H. Saxon, L.E. Sinclair, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, R. Sinkus, K. Wick, B.D. Burow, L. Hagge, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche, T.C. Bacon, N. Brümmer, I. Butterworth, V.L. Harris, G. Howell, B.H.Y. Hung, L. Lamberti, K.R. Long, D.B. Miller, N. Pavel, A. Prinias, J.K. Sedgbeer, D. Sideris, A.F. Whitfield, U. Mallik, M.Z. Wang, S.M. Wang, J.T. Wu, P. Cloth, D. Filges, S.H. An, G.H. Cho, B.J. Ko, S.B. Lee, S.W. Nam, H.S. Park, S.K. Park, S. Kartik, H.-J. Kim, R.R. McNeil, W. Metcalf, V.K. Nadendla, F. Barreiro, J.P. Fernandez, R. Graciani, J.M. Hernández, L. Hervás, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J.F. de Trocóniz, F. Corriveau, D.S. Hanna, J. Hartmann, L.W. Hung, J.N. Lim, C.G. Matthews, P.M. Patel, M. Riveline, D.G. Stairs, M. St-Laurent, R. Ullmann, G. Zacek, T. Tsurugai, V. Bashkirov, B.A. Dolgoshein, A. Stifutkin, G.L. Bashindzhagyan, P.F. Ermolov, L.K. Gladilin, Yu.A. Golubkov, V.D. Kobrin, I.A. Korzhavina, V.A. Kuzmin, O.Yu. Lukina, A.S. Proskuryakov, A.A. Savin, L.M. Shcheglova, A.N. Solomin, N.P. Zotov, M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, J. Gilmore, C. Li, T.Y. Ling, P. Nylander, I.H. Park, T.A. Romanowski, D.S. Bailey, R.J. Cashmore, A.M. Cooper-Sarkar, R.C.E. Devenish, N. Harnew, M. Lancaster, L. Lindemann, J.D. McFall, C. Nath, V.A. Noyes, A. Quadt, J.R. Tickner, H. Uijterwaal, R. Walczak, D.S. Waters, F.F. Wilson, T. Yip, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin, J. Bulmahn, R.G. Feild, B.Y. Oh, J.J. Whitmore, G. D'Agostini, G. Marini, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, T.P. Shah, E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J.T. Rahn, H.F.-W. Sadrozinski, A. Seiden, D.C. Williams, J. Biltzinger, R.J. Seifert, O. Schwarzer, A.H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, A. Levy, J.I. Fleck, M. Inuzuka, T. ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, T. Matsushita, K. Yamauchi, R. Cirio, M. Costa, M.I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staino, M. Dardo, D.C. Bailey, F. Benard, M. Brkic, C.-P. Fagerstroem, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, S. Polenz, C.R. Sampson, D. Simmons, R.J. Teuscher, J.M. Butterworth, C.D. Catterall, T.W. Jones, P.B. Kaziewicz, J.B. Lane, R.L. Saunders, J. Shulman, M.R. Sutton, B. Lu, L.W. Mo, W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Żarnecki, M. Adamus, C. Coldewey, Y. Eisenberg, D. Hochman, U. Karshon, D. Revel, D. Zer-Zion, W.F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R.J. Loveless, S. Mattingly, D.D. Reeder, S. Silverstein, W.H. Smith, A. Vaiciulis, M. Wodarczyk, S. Bhadra, M.L. Cardy, W.R. Frisken, M. Khakzad, W.N. Murray, W.B. Schmidke, and ZEUS at HERA (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, COLLISIONS, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, Jet (particle physics), PPBAR COLLIDER, PROTON, 01 natural sciences, 7. Clean energy, law.invention, CROSS-SECTIONS, High Energy Physics - Experiment, Nuclear physics, EVENTS, High Energy Physics - Experiment (hep-ex), GAMMA-P INTERACTIONS, MONTE-CARLO, law, 0103 physical sciences, Invariant mass, 010306 general physics, Collider, Nuclear Experiment, Quantum chromodynamics, Physics, ZEUS (particle detector), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, ZEUS, ZEUS BARREL CALORIMETER, HERA, Rest frame, Gluon, PARTON DISTRIBUTIONS, HARD SCATTERING, High Energy Physics::Experiment
Abstract

Jet photoproduction, where the two highest transverse energy ($\ETJ$) jets have $\ETJ$ above 6 GeV and a jet-jet invariant mass above 23~GeV, has been studied with the ZEUS detector at the HERA $ep$ collider. Resolved and direct photoproduction samples have been separated. The cross section as a function of the angle between the jet-jet axis and the beam direction in the dijet rest frame has been measured for the two samples. The measured angular distributions differ markedly from each other. They agree with the predictions of QCD calculations, where the different angular distributions reflect the different spins of the quark and gluon exchanged in the hard subprocess., 20 pages including 4 figures

9. Study of D* (2010)± production in ep collisions at HERA

Author

A. Nigro, Yasunori Yamazaki, J. Kochocki, B. Gutjahr, H. Hultschig, John Hart, L. M. Shcheglova, A. Prinias, D. Haun, E. Barberis, A. N. Solomin, U. Mallik, R. R. McNeil, K. Desler, M. Lancaster, W. Koch, F. Selonke, E. Hilger, A.F. Whitfield, S.M. Mari, J.T. Wu, K. Charchuła, Giuseppe Iacobucci, M. Krzyżanowski, W. Metcalf, H. Beier, Tadeusz Kowalski, J. Große-Knetter, A. Bruni, D. Daniels, U. Holm, B.Y. Oh, M. Löwe, Y Zhang, D.D. Reeder, B. Diekmann, M. Wodarczyk, G. Poelz, J. Mollen, J. Zaja̧c, P. B. Kaziewicz, L. Köpke, L. Lamberti, H. Uijterwaal, Lutz Feld, J. J. Whitmore, C. Li, Rosario Nania, Sung Keun Park, Nicolo Cartiglia, N. Pavel, I. Suzuki, G.R. Smith, Krzysztof Piotrzkowski, P. Bruni, Costas Foudas, J.F. Zhou, Christian Nemoz, Giancarlo Susinno, Vladimir Bashkirov, L.W. Mo, K. K. Joo, Y. Iga, Cristiana Peroni, N. Dyce, A. Meyer, G. Briskin, Mariusz Przybycien, M. Corradi, Tobias M. Haas, William S. Lockman, G. Grzelak, Matthias Kasemann, K. M. Furutani, D. Westphal, D. Notz, R. J. Cashmore, S. Nickel, M. Derrick, D. B. Miller, C. Voci, B. Surrow, S.H. An, T. Tymieniecka, M. Zachara, S. Mengel, J. Mainusch, D. Schramm, C. A. Heusch, Ada Solano, R. S. Orr, R.S. Gilmore, H.J. Grabosch, S. H. Yon, T. W. Jones, Anna Goussiou, G. L. Bashindzhagyan, N. P. Zotov, W.B. Schmidke, R. J. Teuscher, Shoichi Yamada, R.C.E. Devenish, Avto Kharchilava, W. Schott, Cd Catterall, T. C. Bacon, U. Kötz, A. Dannemann, H.G.J.M. Tiecke, F. Benard, O. Mańczak, G. F. Hartner, Roberto Carlin, Q. Zhu, I. Fleck, U. Karshon, J.B. Lane, Gy. Wolf, Rr Rau, J.A. O'Mara, Marcel Vreeswijk, S. Limentani, Kenneth Long, K. Wick, S. De Pasquale, Luis Hervas, S. Ritz, D. Boscherini, Marco Schioppa, S. Magill, J. Gajewski, B. Behrens, O. Deppe, T. Doeker, A. Caldwell, M. Roco, J.D. McFall, V. K. Nadendla, R. J. Nowak, G. Bari, G. Laurenti, J. Del Peso, P. G. Pelfer, J. Repond, Masashi Hazumi, G. Castellini, R.L. Talaga, T. Tsurugai, K. Ohrenberg, M. Van Hook, L.E. Sinclair, S.S. Wilson, P. Luffman, A. Frey, A. Bertolin, B. Bednarek, P.F. Ermolov, C. Rembser, J. Bulmahn, K.W. McLean, P.B. Straub, H. Zhang, H.-P. Jakob, A. Ladage, S. Söldner-Rembold, K. Homma, Samuel Silverstein, R. L. Saunders, J. F. Martin, M.B. Crombie, R. Seidlein, E. Lohrmann, J.S.T. Ng, M. Basile, W. H. Smith, P. Giusti, M. Brkic, E. Badura, D. Zer-Zion, J. F. de Trocóniz, L. Zawiejski, Roberto Cirio, A. Byrne, Fernando Barreiro, Robert Stanek, A. Mass, N. Wulff, P. Joos, J. Stamm, F. Zetsche, E. Stiliaris, K. Eskreys, I. Gialas, M.C.K. Mattingly, L. S. Durkin, R. Yoshida, L. Wai, J. Schroeder, R. Brugnera, R. Hamatsu, J. Puga, N. A. McCubbin, V. A. Kuzmin, D. C. Bailey, Cg Matthews, Luca Stanco, Mário Costa, D. Hasell, G. Zacek, Mauro Morandin, G. D'Agostini, M. Z. Wang, B. Foster, S. Bhadra, J. K. Sedgbeer, R. Imlay, L. W. Hung, T. Y. Ling, T. Yip, Jens Hartmann, L. Iannotti, M. De Giorgi, C. Youngman, Y. Zamora Garcia, V. D. Kobrin, T. Dubbs, Y. Nakamitsu, Katsuo Tokushuku, T.P. Shah, S. M. Wang, Ulf Behrens, F.S. Chlebana, Federico Cindolo, W. Bogusz, S. Eisenhardt, W. Hain, L. Lindemann, G. Bruni, Simon George, Umberto Dosselli, R. J. Seifert, Giovanni Abbiendi, I. H. Park, Tachishige Hirose, D. H. Saxon, T. Voß, A. Bargende, J. M. Pawlak, G.A. Blair, Leszek Adamczyk, M.I. Ferrero, M. Adamus, G. Marini, A.K. Wróblewski, A. Bamberger, Masami Chiba, D. Mikunas, Janusz Chwastowski, Klaus Kurt Desch, Luisa Cifarelli, A. M. Cooper-Sarkar, L. K. Gladilin, Neville Harnew, S. Dagan, W. Schulz, Robert Klanner, A. Vaiciulis, E. Tassi, Gm Levman, Djp Norman, I. Ali, Ben Bylsma, J. Milewski, A. Quadt, E. A. De Wolf, J. Biltzinger, H. Hartmann, D. S. Bailey, M. Khakzad, M. L. Cardy, P. Göttlicher, K. Honscheid, Yu. A. Golubkov, Y. Eisenberg, M.A.J. Botje, R. G. Feild, D. Krakauer, K. Yamauchi, H. Kowalski, M. Eckert, L. Bellagamba, M. St.Laurent, E. Paul, D.J. Gilkinson, M. Kuze, F. Dal Corso, S. Kartik, E. Rulikowska-Zarȩbska, Douglas Gingrich, Francois Corriveau, R. Walczak, H. F.W. Sadrozinski, Ricardo Graciani, K. Heinloth, Giuseppe Barbagli, L. Hagge, F. Sciulli, D. Revel, T. Hasegawa, J. Roldán, Roberto Sacchi, A. Leich, C. Glasman, B. Hubbard, C. P. Fagerstroem, F. Palmonari, A. Stifutkin, Sridhara Dasu, S. Mine, S Campbell-Robson, Halina Abramowicz, A.S. Proskuryakov, Giuseppe Levi, K. Muchorowski, W.F. Badgett, K. Jelen, T. Ishii, A. Kotański, L.A.T. Bauerdick, T.L. Short, R.J. Tapper, Amedeo Staiano, U. F. Katz, A. Freidhof, B. Lu, M. Posocco, W.R. Frisken, G. Sartorelli, Aharon Levy, T.J. Llewellyn, J. N. Lim, J. M. Hernandez, Debades Bandyopadhyay, J. K. Bienlein, R. van Woudenberg, G.P. Heath, M. de Kamps, B. Musgrave, D. Filges, R. Sinkus, S. W. Nam, R. Stroili, Antonino Zichichi, A. Bernstein, J.J. Engelen, P.M. Kooijman, U. Schneekloth, H. J. Kim, R. Wedemeyer, Giovanni Maccarrone, Thomas Trefzger, S. Schlenstedt, P. J. Bussey, A. Cassidy, I. Butterworth, M. Nakahata, D. S. Hanna, M. L. Utley, S. M. Hong, E. Gallo, Andrea Contin, James Crittenden, S. Yang, A. Kruse, Anselmo Margotti, P. Cloth, L.W. Wiggers, K. Prytz, Danuta Kisielewska, Ta Romanowski, T. Massam, E. McCliment, Y. Nagasawa, R. Ayad, H.F. Heath, G. Cases, T. Neumann, B. Löhr, A. Seiden, F. F. Wilson, J. A. Zakrzewski, M. Grothe, C.J.S. Morgado, Michele Arneodo, S. Kitamura, J. Ciborowski, M. Chiarini, J.A. Parsons, R. Ullmann, J. Shulman, Juan Terron, M. Kasprzak, Jonathan Butterworth, G. Cara Romeo, C. Fordham, A. Eskreys, Lucia Votano, A. T. Doyle, L. Labarga, Wouter Verkerke, C. Nath, H. Heßling, G. Geitz, B. Y. H. Hung, A. A. Savin, B. D. Burow, W.N. Murray, G. Anzivino, M. Nakao, P. Borzemski, G. Drews, G. Zech, M. Flasiński, R. Schattevoy, A.S. Wilson, M. Dardo, C. Coldewey, L. Suszycki, A. H. Walenta, B. A. Dolgoshein, P. Morawitz, Aleksander Filip Żarnecki, Silvia Maselli, D. Lüke, A. Polini, D. Acosta, Dg Stairs, D. Horstmann, R. Timellini, A. Dake, N. H. Brook, V. L. Harris, M. Rohde, R. Loveless, J. Labs, M. H. Suh, M. Geerts, K. Blankenship, C.R. Sampson, Jeffrey T. Rahn, P. M. Patel, V.A. Noyes, and Zeus (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, Meson, Proton, LUND MONTE-CARLO, photoproduction, charmed meson production, FOS: Physical sciences, 01 natural sciences, Zeus (malware), JET FRAGMENTATION, Charm quark, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), CHARM PHOTOPRODUCTION, GAMMA-P INTERACTIONS, 0103 physical sciences, Charm (quantum number), 010306 general physics, Quantum chromodynamics, Physics, ZEUS, LEADING-ORDER QCD, PARTON DISTRIBUTIONS, CROSS-SECTION, HARD SCATTERING, HEAVY QUARKS, E+E-PHYSICS, 010308 nuclear & particles physics, HERA, Gluon
Abstract

We report the first observation of charmed mesons with the ZEUS detector at HERA using the decay channel ${\rm D}^{*+}\rightarrow (\Do \rightarrow {\rm K}^-\pi^+)\pi^+$ (+ c.c.). Clear signals in the mass difference $\Delta M$=$M$(D$^*$)--$M$(D$^0)$ as well as in the $M(K\pi)$ distribution at the D$^0$ mass are found. The $ep$ cross section for inclusive \DSpm\ production with $Q^2, Comment: 19 pages, latex, 3 figures appended as uuencoded file

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