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1. Measurement of the proton structure function F2 and σ at low and very low x at HERA

Author

Michele Arneodo, Ada Solano, S. Limentani, G. F. Susinno, M. St-Laurent, L. Suszycki, I. T. Lim, S. Bhadra, A. M. Cooper-Sarkar, S. Dagan, C. A. Heusch, Marco Schioppa, S. Magill, M. Khakzad, N.C. Brummer, Yu. A. Golubkov, E. Paul, P. G. Pelfer, A. Meyer-Larsen, S. Nam, T. Ishii, Costas Foudas, M. Posocco, J. Hartmann, E. Lohrmann, A. Bertolin, R. S. Orr, C. Voci, J. F. de Trocóniz, C. M. Ginsburg, R. Ayad, H.E. Blaikley, Mariusz Przybycien, M. Corradi, Kenneth Long, S. Ritz, L.W. Mo, H. Zhang, J. F. Martin, A. Caldwell, L. Zawiejski, Roberto Cirio, C.H. Bokel, J.A. Parsons, Y. Zamora Garcia, T. Voß, S. Polenz, F. Selonke, M. Zachara, E. Hilger, H.J. Grabosch, W.N. Cottingham, G. Bari, B. Lu, G. Cara Romeo, A. Meyer, J. Repond, H. F.W. Sadrozinski, K. Umemori, D.S. Hanna, Rosario Nania, Sung Keun Park, O. Deppe, R.C.E. Devenish, Q. Zhu, Giovanna Bruni, B. Bednarek, G. Laurenti, K. Coböken, A. Kotański, H.-P. Jakob, R. L. Saunders, U. Wollmer, L.K. Gladilin, A. Quadt, C. Coldewey, L. Lamberti, D. Simmons, L.A.T. Bauerdick, Marcel Vreeswijk, J.R. Okrasiński, Matthias Kasemann, D.G. Roff, F. Zetsche, M. L. Utley, Yuji Yamazaki, F. Pelucchi, A. Stifutkin, B. Mellado, James Crittenden, F. Dal Corso, Giuseppe Levi, R. Brugnera, John Hart, B. Surrow, Jongmin Lee, D. Kçira, L. Iannotti, R. Kerger, K. Jelen, R.L. Talaga, T. Yamashita, W.F. Badgett, W.R. Frisken, V. A. Kuzmin, D. C. Bailey, M. Grothe, L. Heinz, J. P. Fernandez, Ian Brock, H.F. Heath, L. Lindemann, J. Ciborowski, J. Del Peso, Giuseppe Barbagli, H. Salehi, D. Notz, J. A. Zakrzewski, S. Sampson, U. Schneekloth, J. Bulmahn, Katsuo Tokushuku, T. W. Jones, O. Ruske, M. Dardo, I. Butterworth, Y. Iga, M. Brkic, Gm Levman, Umberto Dosselli, M. Roco, O. Yu. Lukina, D. Epperson, A. Prinias, B.Y. Oh, Janusz Chwastowski, P. Nylander, K. K. Joo, S. Yamada, R. Yoshida, A. Polini, Elisabetta Gallo, D. S. Waters, K. Homma, D. Hasell, G. D'Agostini, B.D. Burow, Richard Hall-Wilton, J. Stamm, B. Foster, E. Strickland, M. Nakao, T. Y. Ling, Ta Romanowski, E. A. De Wolf, I. A. Korzhavina, J. R. Tickner, G. L. Bashindzhagyan, W.B. Schmidke, R. J. Teuscher, K. Yamauchi, W. Koch, O. Mańczak, P. Markun, G. F. Hartner, H. Beier, T.P. Shah, Tachishige Hirose, C. Amelung, Robert Klanner, A. Vaiciulis, U. Holm, S. Mattingly, R. Cross, M.E. Hayes, O. Schwarzer, J. Gilmore, Silvia Maselli, L.W. Hung, R. Stanek, J. M. Pawlak, Jonathan Butterworth, Tadeusz Kowalski, G. Poelz, A. Nigro, S. Eisenhardt, N. Tuning, Joanne Cole, S. A. Zotkin, J. Y. Kim, R. Pawlak, A. Garfagnini, W. Schott, Cd Catterall, U. Fricke, Fernando Barreiro, B. Löhr, Lucia Votano, Z. Duliński, C. Nath, J.D. McFall, C. L. Kim, T. Matsushita, I. Suzuki, K. Muchorowski, R. Waugh, G. Cases, Y. Eisenberg, S. Kitamura, A.F. Whitfield, M.C.K. Mattingly, L. S. Durkin, Mark Sutton, S. M. Wang, D. H. Saxon, R. Stroili, D.J. Gilkinson, Guillaume Garcia, R. Walczak, K. Heinloth, Pietro Antonioli, Luisa Cifarelli, Neville Harnew, Roberto Carlin, P. Göttlicher, J.N. Lim, G. Howell, R. Wedemeyer, J.K. Edmonds, D. Horstmann, D. Chapin, A.I. van Sighem, P.F. Ermolov, H. Wieber, J. Roldán, N. H. Brook, R. Hamatsu, V. L. Harris, K. Wick, Mauro Morandin, Z. Jakubowski, J. Puga, G. Sartorelli, M. Przybycien, K. Nagano, C. Youngman, M. Rohde, Luca Stanco, Lev Khein, R. Deffner, A.A. Savin, Krzysztof Piotrzkowski, J.T. Bromley, C. Rembser, M. Adamus, Danuta Kisielewska, G. Marini, T. Massam, E. Rulikowska-Zarȩbska, C. Glasman, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, G. Abbiendi, K. Desler, D. Acosta, Roberto Sacchi, M. Riveline, S. Kananov, J. K. Sedgbeer, D. Piccioni, P. Cloth, Cristiana Peroni, M. Kuze, R. J. Cashmore, J. Labs, M. Derrick, T. Tymieniecka, A. H. Walenta, N. A. McCubbin, U. Kötz, D.D. Reeder, D. Revel, M. Wodarczyk, D. Sideris, N. Gendner, F. Sciulli, J. Breitweg, F. Ricci, D. B. Miller, C.-P. Fagerstroem, Antonino Zichichi, J.J. Engelen, M. Basile, R. J. Nowak, Aharon Levy, A. Pellegrino, T. Haas, F. Anselmo, A. Pesci, A. N. Solomin, U. Mallik, Ben Bylsma, J. Milewski, Kurtis F Johnson, J. M. Hernandez, G.P. Heath, A. Bornheim, H. Park, H. Hartmann, J. Große-Knetter, P. Giusti, W. Liu, Laurel E. Sinclair, R.J. Tapper, Sridhara Dasu, S Campbell-Robson, Halina Abramowicz, F. Palmonari, P. B. Kaziewicz, K. Ohrenberg, H. Uijterwaal, V. Monaco, G. Drews, Giovanni Maccarrone, D. Hochman, W. Hain, S. Schlenstedt, P. J. Bussey, Thomas Trefzger, H.G.J.M. Tiecke, A. Seiden, T. Doeker, J.J. Ryan, W. H. Smith, Andrea Contin, Anselmo Margotti, J.H. Vossebeld, M. Lancaster, M. Raso, A. Eskreys, A. T. Doyle, L. Labarga, Wouter Verkerke, D. C. Williams, Mário Costa, B. A. Dolgoshein, T. Monteiro, L.W. Wiggers, J.T. Wu, A. Ochs, M. Inuzuka, Marcella Capua, F.S. Chlebana, D.S. Bailey, D. Westphal, J.I. Fleck, M. Eckert, N.A. Korotkova, L. Bellagamba, J. Zaja̧c, J.B. Lane, Gy. Wolf, J. T. Rahn, U. Karshon, Luis Hervas, D. Boscherini, A.S. Proskuryakov, A.F. Żarnecki, G. Briskin, G. Castellini, W.N. Murray, Detlef Filges, N. Pavel, M.A.J. Botje, N. Cartiglia, J.S.T. Ng, P.M. Kooijman, J. Shulman, Ricardo Graciani, Juan Terron, M. Kasprzak, P. Borzemski, S. Wölfle, Amedeo Staiano, U. F. Katz, R. Loveless, T. Fusayasu, M. Pfeiffer, A.S. Wilson, C.R. Sampson, Ulf Behrens, Federico Cindolo, H. Kowalski, R. Ullmann, V.A. Noyes, Miriam Lucio Martinez, S. B. Lee, B. Musgrave, D.G. Stairs, S.H. An, M. Y. Pac, M. C. Petrucci, T. Tsurugai, P.B. Straub, L. M. Shcheglova, Giuseppe Iacobucci, I. Bohnet, Tomohiro Abe, Z. Jing, B. H. Y. Hung, J. K. Bienlein, A. Bruni, M. Löwe, Enrico Tassi, J. J. Whitmore, Vladimir Bashkirov, F. Corriveau, G. Grzelak, T. C. Bacon, S. De Pasquale, I. Gialas, Inkyu Park, Leszek Adamczyk, M.I. Ferrero, D. Mikunas, R. G. Feild, and D. Krakauer

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), ZEUS (particle detector), Neutral current, Proton, 010308 nuclear & particles physics, Scattering, Structure function, HERA, 01 natural sciences, Calorimeter, Nuclear physics, 0103 physical sciences, 010306 general physics
Abstract

A small electromagnetic sampling calorimeter, installed in the ZEUS experiment in 1995, significantly enhanced the acceptance for very low x and low Q 2 inelastic neutral current scattering, e+p → e+X, at HERA. A measurement of the proton structure function F2 and the total virtual photon-proton ( γ ∗ p ) cross-section is presented for 0.11 ≤ Q 2 ≤ 0.65 GeV2 and 2 × 10−6 ≤ x ≤ 6 × 10−5, corresponding to a range in the γ ∗ p c.m. energy of 100 ≤ W ≤ 230 GeV. Comparisons with various models are also presented.

Published
1997
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2. Intuition, Creativity, and Unconscious Aspects of Problem Solving

Author

J.I. Fleck and J. Kounios

Subjects
Cognitive science, Unconscious mind, media_common.quotation_subject, Cognition, Cortical arousal, Right hemisphere, Creativity technique, Psychology, Creativity, Divergent thinking, Cognitive psychology, media_common, Intuition
Abstract

Creativity, insight, and intuition are just some forms of thought believed to rely heavily on the unconscious, giving these areas special status in psychology. Growing interest in creativity and problem solving has led to an influx of novel approaches in the empirical exploration of topics previously believed to be beyond our reach. This article reviews existing research and theory concerning the cognitive, behavioral, and neural components of the unconscious in creativity and problem solving. Of importance is understanding the field's past and conceptualizing its future.

Published
2009
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3. Observation of isolated high-E-T photons in photoproduction at HERA

Author

M. Zachara, R.C.E. Devenish, Q. Zhu, H.-P. Jakob, R. L. Saunders, Danuta Kisielewska, T. Massam, G. Laurenti, B. Mellado, K. Umemori, R. Brugnera, V. A. Kuzmin, D. C. Bailey, M. Kuze, N. Pavel, P.M. Kooijman, M. St-Laurent, D.C. Williams, C. Youngman, A. H. Walenta, Ta Romanowski, F. Dal Corso, M.E. Hayes, L. Iannotti, Antonino Zichichi, R. Loveless, C. Coldewey, J. Shulman, T. Fusayasu, Juan Terron, M. Kasprzak, C.R. Sampson, Jeffrey T. Rahn, Marcel Vreeswijk, R. Ullmann, V.A. Noyes, O. Schwarzer, Helen F Heath, D.D. Reeder, J. Del Peso, C. Rembser, N. A. McCubbin, P. Giusti, Gm Levman, Marco Schioppa, S. Magill, N.C. Brummer, P. G. Pelfer, S.H. An, G. Drews, W.F. Badgett, A.S. Proskuryakov, J. Hartmann, C. Voci, M. Wodarczyk, D. S. Waters, K. Homma, Cristiana Peroni, R. J. Cashmore, K. Yamauchi, M. Y. Pac, W. Hain, C. M. Ginsburg, A. Meyer-Larsen, U. Wollmer, J.J. Ryan, Richard Hall-Wilton, M. Derrick, T. Tymieniecka, S. Ritz, M. Roco, M.A.J. Botje, N. Cartiglia, J. Stamm, B. Foster, U. Kötz, Jonathan Butterworth, S. Yamada, M. C. Petrucci, A. Pesci, H. Kowalski, U. Fricke, S. Mattingly, A. Caldwell, A. Bertolin, Silvia Maselli, N. Gendner, D. Simmons, M. L. Utley, H. Zhang, J. F. Martin, A. Nigro, Fernando Barreiro, Mauro Morandin, Z. Jakubowski, R. S. Orr, F. Palmonari, S. Wölfle, Amedeo Staiano, U. F. Katz, O. Ruske, M. Pfeiffer, M. Brkic, Yuji Yamazaki, D. Horstmann, N. H. Brook, V. L. Harris, Rosario Nania, Sung Keun Park, John Hart, T. Tsurugai, J.T. Bromley, J. Breitweg, F. Ricci, R. J. Nowak, H. F.W. Sadrozinski, Giuseppe Levi, H. Park, Kenneth Long, J. Y. Kim, G. Bari, D. Filges, C. L. Kim, A.F. Whitfield, D. Hasell, G. D'Agostini, R. Kerger, K. Jelen, Matthias Kasemann, A. Prinias, J. F. de Trocóniz, L. Zawiejski, Roberto Cirio, Elisabetta Gallo, A. Bruni, L.K. Gladilin, S. W. Nam, W.R. Frisken, R. Pawlak, F. Selonke, Pietro Antonioli, Luisa Cifarelli, Neville Harnew, E. Hilger, J. Repond, P.B. Straub, D. Piccioni, W. Koch, D.S. Hanna, J.J. Engelen, T. Y. Ling, P. B. Kaziewicz, L. Lamberti, T. Yamashita, M. Löwe, Thomas Trefzger, F. Pelucchi, B. Bednarek, L. Lindemann, K.F. Johnson, S. Sampson, J. A. Zakrzewski, Y. Zamora Garcia, H. Beier, Tadeusz Kowalski, M. Nakao, Robert Klanner, A. Vaiciulis, D.G. Roff, H. Salehi, D. Notz, M. Rohde, D. Sideris, T. W. Jones, D. Revel, Michele Arneodo, Ulf Behrens, Federico Cindolo, B.Y. Oh, H. Uijterwaal, U. Schneekloth, D. Acosta, T. Voß, I. Butterworth, I. Suzuki, G. Poelz, F. Zetsche, K. Coböken, D. B. Miller, L.W. Hung, G. L. Bashindzhagyan, W.B. Schmidke, R. J. Teuscher, M. Lancaster, Anselmo Margotti, Enrico Tassi, J. J. Whitmore, R. Waugh, R. Cross, L.W. Wiggers, C. Amelung, Miriam Lucio Martinez, J. Gilmore, S. B. Lee, Y. Iga, A. M. Cooper-Sarkar, S. Dagan, J. Bulmahn, C. A. Heusch, J.T. Wu, A. Ochs, Mariusz Przybycien, M. Corradi, Vincenzo Monaco, L. Suszycki, M. Khakzad, James Crittenden, Andrea Contin, Katsuo Tokushuku, S. Polenz, G. Cases, M. Basile, A. Pellegrino, T. Haas, Giancarlo Susinno, Yu. A. Golubkov, F. Anselmo, M. Inuzuka, C.H. Bokel, Lucia Votano, C. Nath, C.-P. Fagerstroem, R. Yoshida, B.D. Burow, Costas Foudas, L.W. Mo, B. Surrow, Umberto Dosselli, Jongmin Lee, M.C.K. Mattingly, E. Lohrmann, L. S. Durkin, I. Gialas, B. H. Y. Hung, H.J. Grabosch, Luca Stanco, Lev Khein, A. N. Solomin, T. Ishii, B. Musgrave, U. Mallik, J.I. Fleck, J. Zaja̧c, J. M. Pawlak, R. Hamatsu, Janusz Chwastowski, J. Puga, D.G. Stairs, J.D. McFall, T. Monteiro, M. Posocco, O. Deppe, H.E. Blaikley, Y. Eisenberg, L. M. Shcheglova, D.J. Gilkinson, Guillaume Garcia, R. Walczak, S. Kananov, J. P. Fernandez, J. K. Sedgbeer, E. Paul, A. Garfagnini, P.F. Ermolov, K. Nagano, R. Deffner, G. Bruni, K. Muchorowski, E. A. De Wolf, M. Grothe, J. R. Tickner, K. Heinloth, L. Heinz, J. M. Hernandez, J. K. Bienlein, Giuseppe Barbagli, H. Wieber, J. Roldán, M. Adamus, G. Briskin, Leszek Adamczyk, I. A. Korzhavina, G. Marini, R. Wedemeyer, W.N. Cottingham, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, A. Stifutkin, G.P. Heath, Marcella Capua, Giuseppe Iacobucci, D. Westphal, J. Labs, B. Lu, G. Sartorelli, R. Stanek, S.A. Zotkin, N. Tuning, I.H. Park, M.I. Ferrero, M. Przybycien, J. Große-Knetter, U. Karshon, A.A. Savin, D.S. Bailey, D. Mikunas, P. Nylander, K. K. Joo, Luis Hervas, R. G. Feild, J. Ciborowski, D. Boscherini, A.F. Żarnecki, K. Desler, D. Krakauer, I. Bohnet, Tomohiro Abe, G. Castellini, W.N. Murray, Z. Jing, J.S.T. Ng, Vladimir Bashkirov, A. Quadt, P. Cloth, O. Mańczak, P. Markun, D. Kçira, G. F. Hartner, Ben Bylsma, J. Milewski, M. Bukowy, F. Corriveau, G. Grzelak, M. Eckert, N.A. Korotkova, L. Bellagamba, H. Hartmann, T. C. Bacon, M. Dardo, P. Borzemski, W. Liu, S. De Pasquale, A.S. Wilson, Sridhara Dasu, Ian Brock, R. Ayad, O. Yu. Lukina, S Campbell-Robson, Halina Abramowicz, W. Schott, Cd Catterall, A. Polini, Z. Duliński, R.L. Talaga, J.A. Parsons, D. Epperson, J.K. Edmonds, A.I. van Sighem, K. Wick, G. Abbiendi, G. Cara Romeo, M. Riveline, S. Eisenhardt, F. Sciulli, J.N. Lim, G. Howell, R.J. Tapper, A. Meyer, H.G.J.M. Tiecke, E. Strickland, Giovanni Maccarrone, D. Hochman, S. Schlenstedt, P. J. Bussey, E. Rulikowska-Zarȩbska, Joanne Cole, T.P. Shah, Mark Sutton, S. M. Wang, D. H. Saxon, C. Glasman, A. Bornheim, Tachishige Hirose, P. Göttlicher, Roberto Carlin, D. Chapin, J.B. Lane, Gy. Wolf, Roberto Sacchi, T. Matsushita, R. Stroili, Aharon Levy, Laurel E. Sinclair, A. Seiden, J.H. Vossebeld, M. Raso, A. Eskreys, A. T. Doyle, L. Labarga, Wouter Verkerke, B. A. Dolgoshein, Ada Solano, S. Limentani, I. T. Lim, S. Bhadra, B. Löhr, S. Kitamura, A. Kotański, L.A.T. Bauerdick, J.R. Okrasiński, U. Holm, Krzysztof Piotrzkowski, K. Ohrenberg, W. H. Smith, R. Graciami, Mário Costa, F.S. Chlebana, and Zeus (IHEF, IoP, FNWI)

Subjects
COLLISIONS, Nuclear and High Energy Physics, Particle physics, Photon, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Photon energy, 01 natural sciences, 7. Clean energy, CROSS-SECTIONS, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), GLOBAL QCD, 0103 physical sciences, CALORIMETER, 010306 general physics, Nuclear Experiment, COMPTON-SCATTERING, Quantum chromodynamics, Physics, Jet (fluid), ZEUS (particle detector), CONSTRUCTION, 010308 nuclear & particles physics, Compton scattering, ZEUS, HERA, CENTRAL TRACKING DETECTOR, PARTON DISTRIBUTIONS, Pseudorapidity, High Energy Physics::Experiment, HARD SCATTERING
Abstract

Events containing an isolated prompt photon with high transverse energy, together with a balancing jet, have been observed for the first time in photoproduction at HERA.The data were taken with the ZEUS detector, in a $\gamma p$ centre of mass energy range 120--250 GeV. The fraction of the incoming photon energy participating in the production of the prompt photon and the jet, $x_\gamma$, shows a strong peak near unity, consistent with LO QCD Monte Carlo predictions. In the transverse energy and pseudorapidity range $5\le \eTg < 10$ GeV, $-0.7 \le \eta^\gamma < 0.8$, $\eTj\ge 5$ GeV, and $-1.5\le \eta^{jet}\le 1.8$, with $\xgO > 0.8,$ the measured cross section is $15.3 \pm 3.8 \pm 1.8 pb$, in good agreement with a recent NLO calculation., Comment: 22 pages including 8 figures

Published
1997

4. 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

5. Rapidity gaps between jets in photoproduction at HERA

Author

M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R.L. Talaga, H. Zhang, 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, A. Contin, M. Corradi, 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. Bornheim, J. Crittenden, K. Desch, B. Diekmann, 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, C.J.S. Morgado, J.A. O'Mara, D. Piccioni, D.G. Roff, R.J. Tapper, R. Yoshida, R.R. Rau, M. Arneodo, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno, A. Bernstein, A. Caldwell, N. Cartiglia, 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. 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, C. Coldewey, O. Deppe, K. Desler, G. Drews, M. Flasiński, D.J. Gilkinson, C. Glasman, P. Göttlicher, J. Groß-Knetter, B. Gutjahr, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K.F. Johnson, P. Joos, M. Kasemann, R. Klanner, W. Koch, L. Köpke, U. Kötz, H. Kowalski, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, J. Mainusch, O. Mańczak, T. Monteiro, J.S.T. Ng, S. Nickel, D. Notz, K. Ohrenberg, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, E. Stiliaris, B. Surrow, T. Voß, D. Westphal, G. Wolf, C. Youngman, W. Zeuner, J.F. Zhou, H.J. Grabosch, A. Kharchilava, A. Leich, S.M. Mari, M.C.K. Mattingly, A. Meyer, S. Schlenstedt, N. Wulff, G. Barbagli, E. Gallo, P. Pelfer, G. Anzivino, G. Maccarrone, S. De Pasquale, L. Votano, A. Bamberger, S. Eisenhardt, A. Freidhof, S. Söldner-Rembold, J. Schroeder, T. Trefzger, N.H. Brook, P.J. Bussey, A.T. Doyle, D.H. Saxon, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, T. Neumann, R. Sinkus, K. Wick, E. Badura, B.D. Burow, L. Hagge, E. Lohrmann, J. Milewski, M. Nakahata, N. Pavel, G. Poelz, W. Schott, F. Zetsche, T.C. Bacon, N. Bruemmer, I. Butterworth, V.L. Harris, B.Y.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, P. Cloth, D. Filges, S.H. An, S.M. Hong, S.V. 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, 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, 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, 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, A. Dake, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, H. Tiecke, W. Verkerke, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, J. Gilmore, K. Honscheid, C. Li, T.Y. Ling, K.W. McLean, P. Nylander, I.H. Park, T.A. Romanowski, R. Seidlein, D.S. Bailey, A. Byrne, 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, J. Bulmahn, J.M. Butterworth, R.G. Feild, B.Y. Oh, J.R. Okrasinski, J.J. Whitmore, G. D'Agostini, G. Marini, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, K. Prytz, T.P. Shah, T.L. Short, 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, C. Händel-Pikielny, A. Levy, J.I. Fleck, T. Hasegawa, M. Hazumi, T. Ishii, M. Kuze, S. Mine, Y. Nagasawa, M. Nakao, I. Suzuki, K. Tokushuku, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, Y. Nakamitsu, K. Yamauchi, 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, D.M. Gingrich, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, S. Polenz, 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, 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, U. Karshon, D. Revel, D. Zer-Zion, I. Ali, W.F. Badgett, B. Behrens, S. Dasu, C. Fordham, C. Foudas, A. Goussiou, R.J. Loveless, D.D. Reeder, S. Silverstein, W.H. Smith, A. Vaiciulis, M. Wodarczyk, T. Tsurugai, S. Bhadra, M.L. Cardy, C.-P. Fagerstroem, W.R. Frisken, K.M. Furutani, 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, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, EVENTS, High Energy Physics - Experiment (hep-ex), MONTE-CARLO, DESIGN, 0103 physical sciences, Rapidity, 010306 general physics, Nuclear Experiment, Physics, Research Groups and Centres\Physics\Low Temperature Physics, ZEUS (particle detector), CONSTRUCTION, 010308 nuclear & particles physics, Faculty of Science\Physics, ZEUS, PARTON ELASTIC-SCATTERING, ZEUS BARREL CALORIMETER, HERA, diffractive scattering, photoproduction, High Energy Physics::Experiment
Abstract

Photoproduction events which have two or more jets have been studied in the $W_{\gamma p}$ range 135~GeV $< W_{\gamma p}, Comment: 19 pages, latex, 3 figures appended as uuencoded file. Author list corrected

Published
1996

6. Measurement of Alpha(s) From Jet Rates In Deep-inelastic Scattering At Hera

Author

M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R.L. Talaga, H. Zhang, 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, A. Contin, M. Corradi, 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, A. Bornheim, J. Crittenden, K. Desch, B. Diekmann, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, M. Grothe, H. Hartmann, K. Heinloth, 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, C.J.S. Morgado, J.A. O'Mara, D. Piccioni, D.G. Roff, R.J. Tapper, R. Yoshida, R.R. Rau, M. Arneodo, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno, A. Bernstein, A. Caldwell, N. Cartiglia, 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. Jeleń, D. Kisielewska, T. Kowalski, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, A. Kotański, M. Przybycień, L.A.T. Bauerdick, U. Behrens, H. Beier, J.K. Bienlein, C. Coldewey, O. Deppe, K. Desler, G. Drews, M. Flasiński, D.J. Gilkinson, C. Glasman, P. Göttlicher, J. Große-Knetter, B. Gutjahr, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K.F. Johnson, P. Joos, M. Kasemann, R. Klanner, W. Koch, L. Köpke, U. Kötz, H. Kowalski, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, J. Mainusch, O. Mańczak, T. Monteiro, J.S.T. Ng, S. Nickel, D. Notz, K. Ohrenberg, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, E. Stiliaris, B. Surrow, T. Voß, D. Westphal, G. Wolf, C. Youngman, W. Zeuner, J.F. Zhou, H.J. Grabosch, A. Kharchilava, A. Leich, M.C.K. Mattingly, S.M. Mari, A. Meyer, S. Schlenstedt, N. Wulff, G. Barbagli, P. Pelfer, G. Anzivino, G. Maccarrone, S. De Pasquale, L. Votano, A. Bamberger, S. Eisenhardt, A. Freidhof, S. Söldner-Rembold, J. Schroeder, T. Trefzger, N.H. Brook, P.J. Bussey, A.T. Doyle, D.H. Saxon, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, T. Neumann, R. Sinkus, K. Wick, E. Badura, B.D. Burow, L. Hagge, E. Lohrmann, J. Milewski, M. Nakahata, N. Pavel, G. Poelz, W. Schott, F. Zetsche, T.C. Bacon, N. Bruemmer, I. Butterworth, E. Gallo, V.L. Harris, B.Y.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, 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, 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, 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, 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, A. Dake, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, H. Tiecke, W. Verkerke, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, J. Gilmore, K. Honscheid, C. Li, T.Y. Ling, K.W. McLean, W.N. Murray, P. Nylander, I.H. Park, T.A. Romanowski, R. Seidlein, D.S. Bailey, A. Byrne, 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, J. Bulmahn, J.M. Butterworth, R.G. Feild, B.Y. Oh, J.R. Okrasinski, J.J. Whitmore, G. D'Agostini, G. Marini, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, K. Prytz, T.P. Shah, T.L. Short, 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, C. Händel-Pikielny, A. Levy, J.I. Fleck, T. Hasegawa, M. Hazumi, T. Ishii, M. Kuze, S. Mine, Y. Nagasawa, M. Nakao, I. Suzuki, K. Tokushuku, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, Y. Nakamitsu, K. Yamauchi, 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, D.M. Gingrich, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, S. Polenz, 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, 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, U. Karshon, D. Revel, D. Zer-Zion, I. Ali, W.F. Badgett, B. Behrens, S. Dasu, C. Fordham, C. Foudas, A. Goussiou, R.J. Loveless, D.D. Reeder, S. Silverstein, W.H. Smith, A. Vaiciulis, M. Wodarczyk, T. Tsurugai, S. Bhadra, M.L. Cardy, C.-P. Fagerstroem, W.R. Frisken, K.M. Furutani, M. Khakzad, and W.B. Schmidke

Subjects
Nuclear and High Energy Physics, Particle physics, jet production, ENERGIES, Astrophysics::High Energy Astrophysical Phenomena, Parton, PROTON SCATTERING, 01 natural sciences, perturbative QCD, High Energy Physics - Experiment, CROSS-SECTIONS, Nuclear physics, EVENT GENERATOR, MONTE-CARLO, QCD JETS, ZEUS, CALORIMETER, FRAGMENTATION, DEPENDENCE, 0103 physical sciences, determination of alpha_s, 010306 general physics, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Perturbative QCD, HERA, Deep inelastic scattering, High Energy Physics::Experiment
Abstract

Jet production in deep inelastic scattering for $120, Comment: 22 pages, latex, 4 figures appended as uuencoded file

Published
1995

7. Measurement of the Cross-section For the Reaction Gamma-p-]j/psi-p With the Zeus Detector At Hera

Author

M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave, J Repond, R Stanek, R.L Talaga, H Zhang, 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, A Contin, M Corradi, 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, T Haas, 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, N Cartiglia, 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 Jeleń, D Kisielewska, T Kowalski, E Rulikowska-Zarȩbska, L Suszycki, J Zaja̧c, A Kotański, M Przybycień, L.A.T Bauerdick, U Behrens, H Beier, J.K Bienlein, C Coldewey, O Deppe, K Desler, G Drews, M Flasiński, D.J Gilkinson, C Glasman, P Göttlicher, J Große-Knetter, B Gutjahr, W Hain, D Hasell, H Heßling, Y Iga, P Joos, M Kasemann, R Klanner, W Koch, L Köpke, U Kötz, H Kowalski, J Labs, A Ladage, B Löhr, M Löwe, D Lüke, O Mańczak, T Monteiro, J.S.T Ng, S Nickel, D Notz, K Ohrenberg, M Roco, M Rohde, J Roldán, U Schneekloth, W Schulz, F Selonke, E Stiliaris, B Surrow, T Voß, D Westphal, G Wolf, C Youngman, J.F Zhou, H.J Grabosch, A Kharchilava, A Leich, M.C.K Mattingly, A Meyer, S Schlenstedt, N Wulff, G Barbagli, P Pelfer, G Anzivino, G Maccarrone, S De Pasquale, L Votano, A Bamberger, S Eisenhardt, A Freidhof, S Söldner-Rembold, J Schroeder, T Trefzger, N.H Brook, P.J Bussey, A.T Doyle, J.I Fleck, D.H Saxon, M.L Utley, A.S Wilson, A Dannemann, U Holm, D Horstmann, T Neumann, R Sinkus, K Wick, E Badura, B.D Burow, L Hagge, E Lohrmann, J Mainusch, J Milewski, M Nakahata, N Pavel, G Poelz, W Schott, F Zetsche, T.C Bacon, I Butterworth, E Gallo, V.L Harris, B.Y.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 Terron, 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, M Botje, F Chlebana, A Dake, J Engelen, M de Kamps, P Kooijman, A Kruse, 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.D McFall, C Nath, V.A Noyes, 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, G Marini, A Nigro, E Tassi, J.C Hart, N.A McCubbin, K Prytz, T.P Shah, T.L Short, E Barberis, 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, M Nakao, I Suzuki, K Tokushuku, S Yamada, Y Yamazaki, M Chiba, R Hamatsu, T Hirose, K Homma, S Kitamura, Y Nakamitsu, K Yamauchi, 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, 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, U Karshon, D Revel, D Zer-Zion, I Ali, W.F Badgett, B Behrens, S Dasu, C Fordham, C Foudas, A Goussiou, R.J Loveless, D.D Reeder, S Silverstein, W.H Smith, A Vaiciulis, M Wodarczyk, T Tsurugai, S Bhadra, M.L Cardy, C.-P Fagerstroem, W.R Frisken, K.M Furutani, M Khakzad, and W.B Schmidke

Subjects
Nuclear and High Energy Physics, Particle physics, Proton, LUND MONTE-CARLO, ZEUS, ELASTIC-SCATTERING, BARREL CALORIMETER, PHOTOPRODUCTION, J/PSI, DESIGN, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, Cross section (physics), 0103 physical sciences, photoproduction, J/ψ cross section measurement, 010306 general physics, Nuclear Experiment, Quantum chromodynamics, Physics, Elastic scattering, ZEUS (particle detector), Luminosity (scattering theory), 010308 nuclear & particles physics, HERA, Gluon, High Energy Physics::Experiment
Abstract

This paper reports the cross section measurements for the process ep $\rightarrow$ e~\jpsi~p for $Q^2 < 4$ GeV$^2$ at $\sqrt s = 296$ GeV, based on an integrated luminosity of about 0.5~pb$^{-1}$, using the ZEUS detector. The \jpsi~was detected in its $\rm e^{+}e^{-}$ and $\rm \mu^{+}\mu^{-}$ decay modes. The photoproduction cross section was measured to be $52^{ \ +7}_{-12}\pm 10$~nb at an average $\gamma$p centre of mass energy of 67 GeV and $71^{+13}_{-20}\pm 12$~nb at 114 GeV. The significant rise of the cross section compared to lower energy measurements is not in agreement with VDM models, but can be described by QCD inspired models if a rise in the gluon momentum density at low $x$ in the proton is assumed., Comment: 21 pages, latex, 4 figures appended as uuencoded file

Published
1995

8. 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

9. 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.

10. D* production in deep inelastic scattering at HERA

Author

J.N. Lim, G. Howell, D. Sideris, L.K. Gladilin, G. Castellini, P. Borzemski, Rosario Nania, Sung Keun Park, F. Dal Corso, A.S. Wilson, W. Verkerke, L. Cifarelli, E. Rulikowska-Zarȩbska, D. B. Miller, H.-P. Jakob, R. L. Saunders, Tachishige Hirose, C. Glasman, M. Kuze, L. Lamberti, M. Basile, W.F. Badgett, A. Pellegrino, T. Haas, F. Anselmo, T. Dubbs, C. Rembser, Katsuo Tokushuku, Umberto Dosselli, K. Ohrenberg, T. Yamashita, H. Zhang, S. Dagan, R. Brugnera, V. A. Kuzmin, M. Khakzad, D. C. Bailey, M. Nakao, C. Youngman, Janusz Chwastowski, M. Inuzuka, N. A. McCubbin, J. F. Martin, A. Nigro, W. H. Smith, Yu. A. Golubkov, A. Bornheim, T. Matsushita, P. Giusti, Roberto Sacchi, S. Yamada, G.P. Heath, Gm Levman, D. S. Waters, R. Stroili, E. A. De Wolf, G. Drews, W. Hain, Y. Zamora Garcia, J. Bulmahn, T. Voß, M. Posocco, C. L. Kim, D.S. Bailey, B. Löhr, A.S. Proskuryakov, K. Yamauchi, H. Kowalski, J. R. Tickner, M. Lancaster, J.T. Wu, Danuta Kisielewska, T. Massam, A. Ochs, Aharon Levy, F.S. Chlebana, Peter Bussey, A.F. Whitfield, S. Mattingly, P. Cloth, M. Eckert, N.A. Korotkova, L. Bellagamba, S. Nam, Cristiana Peroni, R. J. Cashmore, A. Zichichi, Matthias Kasemann, R. Yoshida, R. Ayad, N. Pavel, B.D. Burow, D.G. Roff, R. Pawlak, J.I. Fleck, Michele Arneodo, P. Nylander, K. K. Joo, J.A. Parsons, H. Salehi, W.N. Cottingham, J. Zaja̧c, J. Hartmann, D. Notz, J. Shulman, Laurel E. Sinclair, B. Lu, G. Cara Romeo, O. Mańczak, P. Markun, M. Derrick, C. Voci, G. F. Hartner, Juan Terron, M. Kasprzak, I. Suzuki, R. Waugh, M. St-Laurent, William S. Lockman, U. Holm, R. Stanek, G. Briskin, P.M. Kooijman, T. W. Jones, J. M. Pawlak, C. M. Ginsburg, L. Suszycki, S. Kitamura, G. L. Bashindzhagyan, W.B. Schmidke, R. J. Teuscher, D.C. Williams, C. Coldewey, A. H. Walenta, T. Tymieniecka, U. Kötz, S. Ritz, A. Garfagnini, A. Caldwell, R. Cross, Z. Duliński, I.H. Park, N. Cartiglia, Giuseppe Levi, J. Gilmore, K. Muchorowski, N. Gendner, D. Kçira, Ian Brock, J.D. McFall, K. Jelen, Ricardo Graciani, J.K. Edmonds, A.I. van Sighem, J.T. Bromley, Krzysztof Piotrzkowski, F. Palmonari, Joanne Cole, P.F. Ermolov, W.R. Frisken, Richard Hall-Wilton, K. Wick, Marco Schioppa, S. Magill, N.C. Brummer, P. G. Pelfer, J. Breitweg, R. Wedemeyer, G. Cases, G. Abbiendi, S. Wölfle, Costas Foudas, L.W. Mo, Amedeo Staiano, Yuji Yamazaki, E. Strickland, Silvia Maselli, R. Loveless, M. Pfeiffer, Amanda Cooper-Sarkar, D. Acosta, M. Riveline, T. Fusayasu, D. Filges, R. J. Nowak, Luca Stanco, Lev Khein, T.P. Shah, Mark Sutton, S. M. Wang, D. H. Saxon, S. Sampson, R. S. Orr, J. Stamm, Vincenzo Monaco, B. Foster, F. Sciulli, A. Quadt, S.A. Zotkin, U. Schneekloth, P. Göttlicher, M.C.K. Mattingly, L. Lindemann, J. A. Zakrzewski, S. Kananov, J. K. Sedgbeer, C.R. Sampson, A. Kotański, G. Bruni, D. Horstmann, N. H. Brook, V. L. Harris, Kenneth Long, J. Labs, I. Butterworth, L. S. Durkin, L.A.T. Bauerdick, Y. Iga, R. Hamatsu, A. Pesci, Roberto Carlin, M. Rohde, J. Y. Kim, R.J. Tapper, Jeffrey T. Rahn, J.R. Okrasiński, Pietro Antonioli, Neville Harnew, G. Bari, J. Repond, O. Ruske, Ben Bylsma, J. Milewski, J. Puga, D.S. Hanna, M. Van Hook, B. Bednarek, H. Hartmann, D. Chapin, Thomas Trefzger, K.F. Johnson, A. Seiden, T. Doeker, Jose M Hernandez, K. Nagano, M. Roco, Giovanni Maccarrone, D. Hochman, R. Deffner, W. Liu, S. Schlenstedt, M. Brkic, M. Adamus, Sridhara Dasu, F. Zetsche, J.H. Vossebeld, M. Raso, A. Eskreys, A. T. Doyle, Ta Romanowski, R. Ullmann, V.A. Noyes, G. Marini, Ada Solano, J. Ciborowski, A. Kruse, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, S Campbell-Robson, Halina Abramowicz, L. Labarga, T. Monteiro, K. Coböken, F. Selonke, B. Surrow, Marcella Capua, S. Limentani, D. Hasell, O. Yu. Lukina, E. Hilger, G. D'Agostini, B. A. Dolgoshein, Jongmin Lee, F. Pelucchi, M. Dardo, I. T. Lim, James Crittenden, S. Bhadra, Jonathan Butterworth, T. Y. Ling, B.Y. Oh, Roman Walczak, A. Polini, U. Fricke, M. Grothe, C. A. Heusch, C. Amelung, S. De Pasquale, L. Heinz, E. Lohrmann, H.E. Blaikley, W. Schott, Cd Catterall, A. Meyer-Larsen, A. Bertolin, J.J. Engelen, Robert Klanner, A. Vaiciulis, Leszek Adamczyk, Anselmo Margotti, L.W. Wiggers, S. Polenz, J. F. de Trocóniz, L. Zawiejski, Roberto Cirio, Y. Eisenberg, D.J. Gilkinson, Guillaume Garcia, D.D. Reeder, J. P. Fernandez, M. Wodarczyk, I. A. Korzhavina, D. Westphal, H. Park, U. Karshon, K. Heinloth, Giuseppe Barbagli, Luis Hervas, J. Roldán, D. Boscherini, P. B. Kaziewicz, W.N. Murray, J.S.T. Ng, H. Uijterwaal, H.G.J.M. Tiecke, G. Sartorelli, M. Przybycien, J.B. Lane, Gy. Wolf, A.A. Savin, A. Contin, L.W. Hung, Lucia Votano, C. Nath, M. Zachara, R.C.E. Devenish, Q. Zhu, G. Laurenti, L. Iannotti, A. Prinias, Elisabetta Gallo, W. Koch, H. Beier, Tadeusz Kowalski, G. Poelz, Lutz Feld, S.H. An, M. Y. Pac, M. C. Petrucci, T. Tsurugai, P.B. Straub, L. M. Shcheglova, Giuseppe Iacobucci, M.A.J. Botje, I. Bohnet, Tomohiro Abe, Z. Jing, Ulf Behrens, Federico Cindolo, Miriam Lucio Martinez, S. B. Lee, T. Ishii, B. Musgrave, D.G. Stairs, K. Desler, Hartmut Sadrozinski, R.L. Talaga, S. Eisenhardt, J.J. Ryan, B. H. Y. Hung, J. K. Bienlein, Mariusz Przybycien, M. Corradi, C.H. Bokel, H.J. Grabosch, O. Deppe, M.E. Hayes, O. Schwarzer, Helen F Heath, U. Wollmer, I. Gialas, Marco Costa, D. Simmons, John Hart, M.I. Ferrero, D. Mikunas, R. G. Feild, D. Krakauer, A. Meyer, K. Umemori, A. Bruni, M. Löwe, Marcel Vreeswijk, Enrico Tassi, J. J. Whitmore, Giancarlo Susinno, Vladimir Bashkirov, F. Corriveau, G. Grzelak, T. C. Bacon, J. Del Peso, K. Homma, E. Barberis, C.-P. Fagerstroem, A. N. Solomin, U. Mallik, A.V. Shumilin, J. Große-Knetter, Fernando Barreiro, Martin Utley, Mauro Morandin, Z. Jakubowski, U. F. Katz, D. Piccioni, A.F. Ż.arnecki, D. Revel, E. Paul, A. Stifutkin, and Zeus (IHEF, IoP, FNWI)

Subjects
COLLISIONS, Nuclear and High Energy Physics, Particle physics, Proton, FOS: Physical sciences, PROTON, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, ZEUS CALORIMETER, High Energy Physics - Experiment (hep-ex), Positron, 0103 physical sciences, Charm (quantum number), QCD ANALYSIS, 010306 general physics, Nuclear Experiment, Physics, Quantum chromodynamics, ZEUS (particle detector), CONSTRUCTION, 010308 nuclear & particles physics, ZEUS, CENTRAL TRACKING DETECTOR, PARTON DISTRIBUTIONS, INTRINSIC CHARM, EP SCATTERING, ELECTROPRODUCTION, Structure function, HERA, Deep inelastic scattering, High Energy Physics::Experiment
Abstract

This paper presents measurements of D^{*\pm} production in deep inelastic scattering from collisions between 27.5 GeV positrons and 820 GeV protons. The data have been taken with the ZEUS detector at HERA. The decay channel $D^{*+}\to (D^0 \to K^- \pi^+) \pi^+ $ (+ c.c.) has been used in the study. The $e^+p$ cross section for inclusive D^{*\pm} production with $5, Comment: 17 pages including 4 figures

11. Measurement of elastic Υ photoproduction at HERA

Author

A. Bruni, F. Selonke, E. Hilger, R. Galea, L. M. Shcheglova, Enrico Tassi, J. J. Whitmore, F. Pelucchi, Michele Arneodo, Giancarlo Susinno, Giuseppe Iacobucci, A. Meyer, K. Umemori, G.J. McCance, P. Borzemski, H. Schnurbusch, B.Y. Oh, R.L. Talaga, S. W. Lee, Rosario Nania, Sung Keun Park, J.T. Wu, R. Loveless, Mariusz Przybycien, M. Corradi, W. S. Toothacker, C.H. Bokel, T. Fusayasu, A. Ochs, H.J. Grabosch, H. Zhang, J. F. Martin, C. Amelung, L. Suszycki, H.-P. Jakob, L. Lamberti, I. Bohnet, Jeffrey T. Rahn, Tomohiro Abe, A. Kotański, Antonino Zichichi, D. Epperson, J.I. Fleck, R. Graciani, L.A.T. Bauerdick, J. Zaja̧c, R. L. Saunders, V.A. Noyes, J. Del Peso, U. Wollmer, Z. Jing, J.R. Okrasiński, I. Gialas, C. A. Heusch, K. Coböken, Y. Zamora Garcia, Katsuo Tokushuku, B. Mellado, D. Simmons, Inkyu Park, Leszek Adamczyk, S. J. Hong, John Hart, N. Pavel, J.J. Ryan, Umberto Dosselli, R. Brugnera, Thomas Trefzger, K.F. Johnson, P. Cloth, S. Eisenhardt, Janusz Chwastowski, J.K. Edmonds, A.I. van Sighem, M. Y. Pac, K. Homma, E. Lohrmann, E. A. De Wolf, J. R. Tickner, Danuta Kisielewska, J. Ciborowski, M.I. Ferrero, Ada Solano, D. Mikunas, M.C.K. Mattingly, L. S. Durkin, R. Hamatsu, J. Puga, Els Koffeman, Lucia Votano, C. Nath, Yuji Yamazaki, V. A. Kuzmin, D. Krakauer, K. Nagano, W. H. Smith, G. Briskin, P.M. Kooijman, T. Massam, M.A.J. Botje, N. Cartiglia, W.N. Cottingham, Mário Costa, James Crittenden, H.G.J.M. Tiecke, S. Limentani, D. C. Bailey, C. Youngman, Dong-Chul Son, K. Wick, G. Abbiendi, R. Stanek, R. Deffner, Juan Terron, Vladimir Bashkirov, G.F. Hartner, M. Riveline, Anna Mastroberardino, I. O. Skillicorn, Fernando Barreiro, Andrea Contin, H.E. Blaikley, L.K. Gladilin, Mauro Morandin, M. Adamus, N. Tuning, M. C. Petrucci, F. Corriveau, R. Yoshida, I. T. Lim, M. Grothe, F. Sciulli, H.F. Heath, L. Heinz, M. Dardo, T. Tsurugai, B.D. Burow, G. Grzelak, G. Marini, S. Bhadra, T. Monteiro, J.A. Parsons, G. Cara Romeo, L. Lindemann, J. A. Zakrzewski, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, A. Quadt, M. E. Hayes, H. Lim, Y. Eisenberg, A. Sabetfakhri, C. Coldewey, Guillaume Garcia, H. Raach, Gm Levman, R. S. Orr, P.B. Straub, N. A. McCubbin, T. C. Bacon, D. S. Waters, U. Holm, R. Walczak, F. Palmonari, K. Heinloth, J. M. Pawlak, Jan Figiel, Marcella Capua, Kenneth Long, G. Bari, J. Repond, K. Desler, A. Polini, S. De Pasquale, S. Wölfle, R.J. Tapper, M. Milite, Giuseppe Barbagli, H. Wieber, J. Roldán, D.S. Hanna, T. Yamashita, M. St-Laurent, F. Dal Corso, H. Kowalski, Cristiana Peroni, R. J. Cashmore, B. Bednarek, Amedeo Staiano, U. F. Katz, A. Garfagnini, R. Wichmann, Abhay Deshpande, A. M. Cooper-Sarkar, S. Dagan, S. Mattingly, D. Piccioni, Matthias Kasemann, D.C. Williams, M. Khakzad, K. Klimek, K. Yamauchi, D.G. Roff, J. K. Bienlein, M. Pfeiffer, Ulf Behrens, Federico Cindolo, M. Derrick, T. Tymieniecka, F. Zetsche, Krzysztof Piotrzkowski, A.S. Proskuryakov, Yu. A. Golubkov, Giovanni Maccarrone, D. Hochman, Ta Romanowski, M. Wing, S. K. Dhawan, D. Filges, S. Schlenstedt, P. J. Bussey, R. Pawlak, W.F. Badgett, U. Kötz, P.R.B. Saull, J.B. Lane, Gy. Wolf, H. Salehi, G. Sartorelli, M. Przybycien, J.T. Bromley, D. Notz, G. Howell, M. Posocco, Joanne Cole, S. B. Lee, N. Gendner, C.-P. Fagerstroem, O. Deppe, J. Breitweg, Marco Schioppa, S. Magill, N.C. Brummer, Richard Hall-Wilton, B. Löhr, S. Stonjek, A.A. Savin, P. G. Pelfer, A. N. Solomin, U. Mallik, Jonathan Butterworth, R. Waugh, Aleksander Filip Żarnecki, Silvia Maselli, M. Inuzuka, S. Yamada, E. Rulikowska-Zarȩbska, S. Kitamura, R. J. Nowak, D. Acosta, T. Ishii, P. Nylander, K. K. Joo, U. Fricke, B. Musgrave, D.S. Bailey, B. Smalska, D.G. Stairs, D.D. Reeder, Roberto Carlin, P. Markun, D. Chapin, Vincenzo Monaco, Giuseppe Levi, N. H. Brook, M. Eckert, N.A. Korotkova, L. Bellagamba, M. Wodarczyk, J. Hartmann, A. Meyer-Larsen, Rodney Walker, O. Schwarzer, Z. Duliński, J.D. McFall, C. Voci, M. Rohde, A. Bertolin, R. Kerger, K. Jelen, O. Ruske, W.R. Frisken, T. W. Jones, G. L. Bashindzhagyan, C. M. Ginsburg, D. Sideris, S. Ritz, Costas Foudas, J. F. de Trocóniz, L. Zawiejski, Roberto Cirio, D. Hasell, G. D'Agostini, Tachishige Hirose, D. B. Miller, S. Sampson, A. Caldwell, R. Cross, T. Y. Ling, U. Schneekloth, W.B. Schmidke, A. Bornheim, M. Basile, J. Gilmore, I. Butterworth, A. Pellegrino, T. Haas, F. Anselmo, Robert Klanner, Y. Iga, V. W. Hughes, Alexander Kappes, A. Vaiciulis, T. Nishimura, Claudia Glasman, A. M. Czermak, E. Paul, J. M. Hernandez, T. Matsushita, G.P. Heath, A. Stifutkin, F. Goebel, H. F.W. Sadrozinski, Luca Stanco, Lev Khein, R. Stroili, N. Coppola, S. Kananov, J. K. Sedgbeer, O. Yu. Lukina, G. Bruni, B. Surrow, A. Nigro, Jongmin Lee, C. L. Kim, B. Foster, P.F. Ermolov, J. Y. Kim, Pietro Antonioli, Luisa Cifarelli, Neville Harnew, K. Hebbel, Cd Catterall, S.A. Zotkin, A. Pesci, Ben Bylsma, J. Milewski, M. Bukowy, H. Hartmann, W. Liu, Sridhara Dasu, S Campbell-Robson, Halina Abramowicz, E. A. Heaphy, A. Seiden, I. Suzuki, J.H. Vossebeld, M. Raso, A. Eskreys, A. T. Doyle, L. Labarga, Wouter Verkerke, B. A. Dolgoshein, Marta Ruspa, D. Kçira, Ian Brock, E. Strickland, T.P. Shah, Mark Sutton, S. M. Wang, D. H. Saxon, D. Westphal, U. Karshon, P. Göttlicher, Luis Hervas, D. Boscherini, M. I. Martínez, Roberto Sacchi, G. Castellini, W.N. Murray, M. Kuze, Aharon Levy, Laurel E. Sinclair, A. Prinias, Elisabetta Gallo, P. Giusti, W. Koch, S. Polenz, H. Beier, G. Drews, J. Große-Knetter, W. Hain, Tadeusz Kowalski, G. Poelz, J. P. Fernandez, I. A. Korzhavina, R.C.E. Devenish, Q. Zhu, S. W. Nam, N. Macdonald, J.J. Engelen, G. Laurenti, Anselmo Margotti, L.W. Wiggers, and L. Iannotti

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Meson production, Meson, 010308 nuclear & particles physics, Branching fraction, Nuclear Theory, Perturbative QCD, Particle accelerator, HERA, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

The photoproduction reaction γp → μ+ μ-p has been studied in ep interactions using the ZEUS detector at HERA. The data sample corresponds to an integrated luminosity of 43.2pb-1. The Υ meson has been observed in photoproduction for the first time. The sum of the products of the elastic Υ(1S), Υ(2S),Υ(3S) photoproduction cross sections with their respective branching ratios is determined to be 13.3 ± 6.0(stat.)-2.3+2.7(syst.) pb at a mean photon-proton centre of mass energy of 120 GeV. The cross section is above the prediction of a perturbative QCD model. © 1998 Elsevier Science B.V. All rights reserved.

12. Observation of scaling violations in scaled momentum distributions at HERA

Author

J Breitweg, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave, J Repond, R Stanek, R.L Talaga, R Yoshida, H Zhang, M.C.K Mattingly, F Anselmo, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, G Cara Romeo, G Castellini, L Cifarelli, F Cindolo, A Contin, M Corradi, S De Pasquale, I Gialas, P Giusti, G Iacobucci, G Laurenti, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, A Polini, F Ricci, G Sartorelli, Y Zamora Garcia, A Zichichi, C Amelung, A Bornheim, I Brock, K Coböken, J Crittenden, R Deffner, M Eckert, M Grothe, H Hartmann, K Heinloth, L Heinz, E Hilger, H.-P Jakob, U.F Katz, R Kerger, E Paul, M Pfeiffer, Ch Rembser, J Stamm, R Wedemeyer, H Wieber, D.S Bailey, S Campbell-Robson, W.N Cottingham, B Foster, R Hall-Wilton, M.E Hayes, G.P Heath, H.F Heath, J.d McFall, D Piccioni, D.G Roff, R.J Tapper, M Arneodo, R Ayad, M Capua, A Garfagnini, L Iannotti, M Schioppa, G Susinno, J.Y Kim, J.H Lee, I.T Lim, M.Y Pac, A Caldwell, N Cartiglia, Z Jing, W Liu, B Mellado, J.A Parsons, S Ritz, S Sampson, F Sciulli, P.B Straub, Q Zhu, P Borzemski, J Chwastowski, A Eskereys, J Figiel, K Klimek, M.B Przybycień, L Zawiejski, L Adamczyk, B Bednarek, M Bukowy, 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, U Fricke, D.J Gilkinson, C Glasman, P Göttlicher, T Haas, W Hain, D Hasell, K.F Johnson, M Kasemann, W Koch, U Kötz, H Kowalski, J Labs, L Lindemann, B Löhr, M Löwe, O Mańczak, J Milewski, T Monteiro, J.S.T Ng, D Notz, K Ohrenberg, I.H Park, A Pellegrino, F Pelucchi, K Piotrzkowski, M Roco, M Rohde, J Roldán, J.J Ryan, A.A Savin, U Schneekloth, F Selonke, B Surrow, E Tassi, T Voß, D Westphal, G Wolf, U Wollmer, C Youngman, A.F Żarnecki, W Zeuner, B.D Burow, H.J Grabosch, A Meyer, S Schlenstedt, G Barbagli, E Gallo, P Pelfer, G Maccarrone, L Votano, A Bamberger, S Eisenhardt, P Markun, T Trefzger, S Wölfle, J.T Bromley, N.H Brook, P.J Bussey, A.T Doyle, N Macdonald, D.H Saxon, L.E Sinclair, E Strickland, R Waugh, I Bohnet, N Gendner, U Holm, A Meyer-Larsen, H Salehi, K Wick, L.K Gladilin, D Horstmann, D Kçira, R Klanner, E Lohrmann, G Poelz, W Schott, F Zetsche, T.C Bacon, I Butterworth, J.E Cole, G Howell, B.H.Y Hung, L Lamberti, K.R Long, D.B Miller, N Pavel, A Prinias, J.K Sedgbeer, D Sideris, U Mallik, S.M Wang, J.T Wu, P Cloth, D Filges, J.I Fleck, T Ishii, M Kuze, I Suzuki, K Tokushuku, S Yamada, K Yamauchi, Y Yamazaki, S.J Hong, S.B Lee, S.W Nam, S.K Park, F Barreiro, J.P Fernándeza, G García, R Graciani, J.M Hernández, L Hervás, L Labarga, M Martínez, J del Peso, J Puga, J Terrón, J.F de Trocóniz, F Corriveau, D.S Hanna, J Hartmann, L.W Hung, W.N Murray, A Ochs, M Riveline, D.G Stairs, M St-Laurent, R Ullmann, T Tsurugai, V Bashkirov, B.A Dolgoshein, A Stifutkin, G.L Bashindzhagyan, P.F Ermolov, Yu.A Golubkov, L.A Khein, N.A Korotkova, I.A Korzhavina, V.A Kuzmin, O.Yu Lukina, A.S Proskuryakov, L.M Shcheglova, A.N Solomin, S.A Zotkin, C Bokel, M Botje, N Brümmer, F Chlebana, J Engelen, E Koffeman, P Kooijman, A van Sighem, H Tiecke, N Tuning, W Verkerke, J Vossebeld, M Vreeswijk, L Wiggers, E de Wolf, D Acosta, B Bylsma, L.S Durkin, J Gilmore, C.M Ginsburg, C.L Kim, T.Y Ling, P Nylander, T.A Romanowski, H.E Blaikley, R.J Cashmore, A.M Cooper-Sarkar, R.C.E Devenish, J.K Edmonds, J Große-Knetter, N Harnew, M Lancaster, C Nath, V.A Noyes, A Quadt, O Ruske, J.R Tickner, H Uijterwaal, R Walczak, D.S Waters, A Bertolin, R Brugnera, R Carlin, F Dal Corso, U Dosselli, S Limentani, M Morandin, M Posocco, L Stanco, R Stroili, C Voci, J Bulmahn, B.Y Oh, J.R Okrasiński, W.S Toothacker, J.J Whitmore, Y Iga, G D'Agostini, G Marini, A Nigro, M Raso, J.C Hart, N.A McCubbin, T.P Shah, D Epperson, C Heusch, J.T Rahn, H.F.-W Sadrozinski, A Seiden, R Wichmann, D.C Williams, O Schwarzer, A.H Walenta, H Abramowicz, G Briskin, S Dagan, S Kananov, A Levy, T Abe, T Fusayasu, M Inuzuka, K Nagano, K Umemori, T Yamashita, R Hamatsu, T Hirose, K Homma, S Kitamura, T Matsushita, R Cirio, M Costa, M.I Ferrero, S Maselli, V Monaco, C Peroni, M.C Petrucci, M Ruspa, R Sacchi, A Solano, A Staiano, M Dardo, D.C Bailey, C.-P Fagerstroem, R Galea, G.F Hartner, K.K Joo, G.M Levman, J.F Martin, R.S Orr, S Polenz, A Sabetfakhri, D Simmons, R.J Teuscher, J.M Butterworth, C.D Catterall, T.W Jones, J.B Lane, R.L Saunders, J Shulman, M.R Sutton, M Wing, J Ciborowski, G Grzelak, M Kasprzak, K Muchorowski, R.J Nowak, J.M Pawlak, R Pawlak, T Tymieniecka, A.K Wróblewski, J.A Zakrzewski, M Adamus, C Coldewey, Y Eisenberg, D Hochman, U Karshon, W.F Badgett, D Chapin, R Cross, S Dasu, C Foudas, R.J Loveless, S Mattingly, D.D Reeder, W.H Smith, A Vaiciulis, M Wodarczyk, S Bhadra, W.R Frisken, M Khakzad, W.B Schmidke, and Zeus (IHEF, IoP, FNWI)

Subjects
ZEUS, CENTRAL TRACKING DETECTOR, ZEUS BARREL CALORIMETER, FRAGMENTATION FUNCTIONS, E+E-ANNIHILATION, MASS-ENERGY, QCD, PROTON, CONSTRUCTION, DESIGN, SCATTERING, Nuclear and High Energy Physics, Particle physics, FOS: Physical sciences, Large range, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Scaling, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, Scattering, Detector, HERA, Deep inelastic scattering, Charged particle, High Energy Physics::Experiment
Abstract

Charged particle production has been measured in deep inelastic scattering (DIS) events over a large range of $x$ and $Q^2$ using the ZEUS detector. The evolution of the scaled momentum, $x_p$, with $Q^2,$ in the range 10 to 1280 $GeV^2$, has been investigated in the current fragmentation region of the Breit frame. The results show clear evidence, in a single experiment, for scaling violations in scaled momenta as a function of $Q^2$., Comment: 21 pages including 4 figures, to be published in Physics Letters B. Two references added

13. Diffractive dijet cross sections in photoproduction at HERA

Author

Ada Solano, L. Lamberti, B. Surrow, Jongmin Lee, S. Limentani, Thomas Trefzger, K.F. Johnson, M. Kuze, S. Polenz, Vladimir Bashkirov, I. T. Lim, S. Bhadra, J. Bulmahn, P. Giusti, K. Hebbel, J. F. Martin, J. P. Fernandez, I. O. Skillicorn, Andrea Contin, A. Nigro, G. Drews, W. N. Murray, J. Große-Knetter, J. A. Parsons, C. L. Kim, W. Schott, Cd Catterall, W. Hain, Y. Zamora Garcia, A. Ochs, I. A. Korzhavina, T. Monteiro, H.-P. Jakob, R. L. Saunders, S. Sampson, R. Cross, G. Grzelak, T. C. Bacon, C.-P. Fagerstroem, A. N. Solomin, A. Prinias, Elisabetta Gallo, Costas Foudas, Marcella Capua, R. S. Orr, P. B. Straub, Kenneth Long, R. Yoshida, B.D. Burow, Francois Corriveau, Hartmut Sadrozinski, W. Koch, H.G.J.M. Tiecke, U. Mallik, Greg P Heath, Marco Schioppa, N.C. Brummer, J. Gilmore, R. Brugnera, F. Palmonari, A. Kotański, L.A.T. Bauerdick, S. De Pasquale, N. Coppola, B. A. Dolgoshein, G. Bari, J. M. Pawlak, S. W. Nam, N. Macdonald, Ulf Behrens, Federico Cindolo, S. Wölfle, Lucia Votano, C. Nath, O. Yu. Lukina, J.R. Okrasiński, Amedeo Staiano, J.J. Engelen, Z. Jing, D. Krakauer, M. Pfeiffer, P. G. Pelfer, H. Beier, Tadeusz Kowalski, S. A. Zotkin, A. Garfagnini, B. Bednarek, M. Inuzuka, S. Ritz, Amanda Cooper-Sarkar, D. C. Bailey, A. Sabetfakhri, C. Youngman, Jose Repond, A. Meyer, K. Umemori, Hao Zhang, D. Epperson, N. Cartiglia, D. S. Hanna, D. Filges, Yuji Yamazaki, Miriam Lucio Martinez, S. B. Lee, Anselmo Margotti, G. Poelz, A. Stifutkin, E. Rulikowska-Zarbska, J. D. McFall, L.W. Wiggers, Claudia Glasman, A. Quadt, F. Zetsche, W. S. Toothacker, R. Stanek, S. K. Dhawan, J.T. Wu, P.F. Ermolov, G. Howell, Giuseppe Levi, Gm Levman, Roberto Sacchi, M. Eckert, N.A. Korotkova, L. Bellagamba, D. Westphal, J. T. Rahn, U. Karshon, D Piccioni, S. Eisenhardt, J.B. Lane, W. H. Smith, Gy. Wolf, T. Ishii, D. S. Waters, Michele Arneodo, R. Kerger, K. Jelen, O. Ruske, Luis Hervas, D. Boscherini, Joanne Cole, B. Löhr, D. Mikunas, J.I. Fleck, L. Lindemann, J. Del Peso, J. A. Zakrzewski, L. M. Shcheglova, A. Bruni, Luca Stanco, Lev Khein, Mário Costa, H. Kowalski, Katsuo Tokushuku, R. J. Tapper, S. Kitamura, Aharon Levy, D. Hasell, Danuta Kisielewska, G. D'Agostini, R.C.E. Devenish, K. Homma, Alexander Kappes, W.R. Frisken, G. Castellini, J.S.T. Ng, S. Mattingly, L. Suszycki, G. Briskin, P.M. Kooijman, Umberto Dosselli, Q. Zhu, Jens Hartmann, Janusz Chwastowski, F. J. Sciulli, WN Cottingham, Giuseppe Iacobucci, J.K. Edmonds, A.I. van Sighem, Matthew Wing, K. Wick, Fernando Barreiro, Enrico Tassi, J. J. Whitmore, G. Abbiendi, D.D. Reeder, M. Wodarczyk, T. Y. Ling, Robert Klanner, A. Vaiciulis, U. Holm, S. Kananov, J. K. Sedgbeer, R. Pawlak, E. A. De Wolf, P. Nylander, K. K. Joo, J. R. Tickner, G. Laurenti, Y. Eisenberg, F. Dal Corso, Giancarlo Susinno, T. Massam, I. Gialas, G. Bruni, Laurel E. Sinclair, Mauro Morandin, M.A.J. Botje, Guillaume Garcia, L. W. Hung, M. Riveline, R. Walczak, U. Schneekloth, Jan Figiel, I. Bohnet, K. Heinloth, Tomohiro Abe, K. Coböken, Abhay Deshpande, P. Markun, G. F. Hartner, Roberto Carlin, W.F. Badgett, I. Butterworth, N. Tuning, K. Desler, Krzysztof Piotrzkowski, S. Magill, Giuseppe Barbagli, H. Wieber, J. Roldán, I.H. Park, A. Bornheim, Leszek Adamczyk, James Crittenden, Af Zarnecki, Y. Iga, A. Pesci, R. Wichmann, U. F. Katz, D. Chapin, R. Waugh, M. Y. Pac, A. Seiden, M.I. Ferrero, M. St-Laurent, Rodney Walker, O. Schwarzer, A. Meyer-Larsen, A. M. Czermak, Ben Bylsma, J. Milewski, G. Sartorelli, Ta Romanowski, M. Przybycien, B. Mellado, Z. Duliński, I. Suzuki, L. Iannotti, S. Yamada, A.A. Savin, D. S. Bailey, J.H. Vossebeld, M. Bukowy, M. Grothe, L. Heinz, A. Bertolin, M. C. Petrucci, K. Klimek, Giovanni Maccarrone, D. Hochman, J. Zajc, M. Raso, A. Eskreys, A. T. Doyle, S. Schlenstedt, P. J. Bussey, H. Hartmann, J. K. Bienlein, L. Labarga, T. Tsurugai, R. L. Talaga, S. Stonjek, J. F. de Trocóniz, Jonathan Butterworth, Jose M Hernandez, L. Zawiejski, Roberto Cirio, S. Dagan, C. Voci, Marta Ruspa, M. Khakzad, U. Fricke, W. Liu, V. A. Kuzinin, C. A. Heusch, C. M. Ginsburg, Yu. A. Golubkov, D. Kçira, B. Musgrave, Ian Brock, E. Lohrmann, M. Posocco, E. Paul, Sridhara Dasu, E. Strickland, Halina Abramowicz, T.P. Shah, Mark Sutton, L.K. Gladilin, S. M. Wang, D. H. Saxon, H.E. Blaikley, J. Ciborowski, R. Ullmann, T. Yamashita, P. Göttlicher, K. Yamauchi, M. Dardo, C. Coldewey, H. Raach, A. Polini, Matthias Kasemann, H. Salehi, P. Borzemski, D. Notz, M. Milite, W. Verkerke, T. W. Jones, Antonino Zichichi, G. L. Bashindzhagyan, W.B. Schmidke, R. J. Teuscher, J.J. Ryan, D.C. Williams, DG Roff, J. Stamm, B. Foster, D. Sideris, J. Y. Kim, Pietro Antonioli, D. B. Miller, Luisa Cifarelli, Neville Harnew, M. Basile, A. Pellegrino, T. Haas, F. Anselmo, V. W. Hughes, Richard Hall-Wilton, Silvia Maselli, J.T. Bromley, D. Horstmann, D. Acosta, N. H. Brook, Dg Stairs, Vincenzo Monaco, M. Rohde, R. Graciani, P. Cloth, R. Ayad, G. Cara Romeo, Tachishige Hirose, T. Matsushita, F. Goebel, R. Stroili, N. Pavel, Juan Terron, M. Kasprzak, R. Loveless, T. Fusayasu, Mariusz Przybycien, M. Corradi, C.H. Bokel, V.A. Noyes, S. J. Hong, S. Campbell-Robson, M. E. Hayes, N. A. McCubbin, H.J. Grabosch, A.S. Proskuryakov, Helen F Heath, U. Wollmer, D. Simmons, John Hart, M.C.K. Mattingly, L. S. Durkin, R. Hamatsu, J. Puga, Els Koffeman, K. Nagano, R. Deffner, M. Adamus, G. Marini, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, Allen Caldwell, Cristiana Peroni, R. J. Cashmore, M. Derrick, T. Tymieniecka, U. Kötz, N. Gendner, O. Deppe, J. Breitweg, R. J. Nowak, F. Selonke, E. Hilger, R. Galea, F. Pelucchi, B.Y. Oh, C. Amelung, Rosario Nania, and Sung Keun Park

Subjects
Particle physics, Physics and Astronomy (miscellaneous), LUND MONTE-CARLO, Parton, 01 natural sciences, Zeus (malware), JET FRAGMENTATION, Nuclear physics, DEEP-INELASTIC SCATTERING, Pomeron, 0103 physical sciences, Rapidity, 010306 general physics, Engineering (miscellaneous), Quantum chromodynamics, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, ZEUS, LARGE RAPIDITY GAP, POMERON STRUCTURE, PARTON DISTRIBUTIONS, PERTURBATION-THEORY, HARD SCATTERING, HERA, Deep inelastic scattering, Gluon, High Energy Physics::Experiment
Abstract

Differential dijet cross sections have been measured with the ZEUS detector for photoproduction events in which the hadronic final state containing the jets is separated with respect to the outgoing proton direction by a large rapidity gap. The cross section has been measured as a function of the fraction of the photon (ϰγOBS) and pomeron (βOBS) momentum participating in the production of the dijet system. The observed ϰγOBS dependence shows evidence for the presence of a resolved- as well as a direct-photon component. The measured cross section da/dβOBS increases as βOBS increases indicating that there is a sizeable contribution to dijet production from those events in which a large fraction of the pomeron momentum participates in the hard scattering. These cross sections and the ZEUS measurements of the diffractive structure function can be described by calculations based on parton densities in the pomeron which evolve according to the QCD evolution equations and include a substantial hard momentum component of gluons in the pomeron.

14. 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

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