Dijet angular distributions in photoproduction of charm at HERA
- Chekanov, S
- Derrick, M
- Krakauer, D
- Loizides, J H
- Magill, S
- Musgrave, B
- Repond, J
- Yoshida, R
- Mattingly, M C K
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- Susinno, G
- Kim, J Y
- Kim, Y K
- Lee, J H
- Lim, I T
- Pac, M Y
- Caldwell, A
- Helbich, M
- Liu, X
- Mellado, B
- Ning, Y
- Paganis, S
- Ren, Z
- Schmidke, W
- Sciulli, F
- Chwastowski, J
- Eskreys, A
- Figiel, J
- Olkiewicz, K
- Stopa, P
- Zawiejski, L
- Adamczyk, L
- Bold, T
- Grabowska-Bold, I
- Kisielewska, D
- Kowal, A M
- Kowal, M
- Kowalski, T
- Przybycien, M
- Suszycki, L
- Szuba, D
- Szuba, J
- Kotanski, A
- Slominski, W
- Bauerdick, L A T
- Behrens, U
- Boch, I
- Borras, K
- Chiochia, V
- Dannheim, D
- Drews, G
- Fourletova, J
- Fricke, U
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- Gottlicher, P
- Gutsche, O
- Haas, T
- Hain, W
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- Hillert, S
- Kahle, B
- Kotz, U
- Kowalski, H
- Kramberger, G
- Labes, H
- Lelas, D
- Lohr, B
- Mankel, R
- Melzer-Pellmann, I A
- Moritz, M
- Nguyen, C N
- Notz, D
- Petrucci, M C
- Polini, A
- Raval, A
- Schneekloth, U
- Selonke, F
- Wessoleck, H
- Wolf, G
- Youngman, C
- Zeuner, W
- Schlenstedt, S
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- Pelfer, P G
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- Glasman, C
- Hamilton, J
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- Salehi, H
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- Zhautykov, B O
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- Gonzalez, O
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- Terron, J
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- Antonov, A
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- Dolgoshein, B A
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- Korzhavina, I A
- Kuzmin, V A
- Levchenko, B B
- Lukina, O Y
- Proskuryakov, A S
- Shcheglova, L M
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- Zotkin, S A
- Coppola, N
- Grijpink, S
- Koffeman, E
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- Pellegrino, A
- Schagen, S
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- Velthuis, J J
- Wiggers, L
- de Wolf, E
- Brummer, N
- Bylsma, B
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- Dal Corso, F
- Dusini, S
- Garfagnini, A
- Limentani, S
- Longhin, A
- Parenti, A
- Posocco, P
- Stanco, L
- Turcato, M
- Heaphy, E A
- Metlica, F
- Oh, B Y
- Saull, P R B
- Whitmore, J J
- Iga, Y
- D'Agostini, G D
- Marini, G
- Nigro, A
- Cormack, C
- Hart, J C
- McCubbin, N A
- Heusch, C
- Park, I H
- Pavel, N
- Abramowicz, H
- Gabareen, A
- Kananov, S
- Kreisel, A
- Levy, A
- Abe, T
- Fusayasu, T
- Kagawa, S
- Kohno, T
- Tawara, T
- Yamashita, T
- Hamatsu, R
- Hirose, T
- Inuzuka, M
- Kitamura, S
- Matsuzawa, K
- Nishimura, T
- Arneodo, M
- Ferrero, M I
- Monaco, V
- Ruspa, M
- Sacchi, R
- Solano, A
- Koop, T
- Levman, G M
- Martin, J F
- Mirea, A
- Butterworth, J M
- Gwenlan, C
- Hall-Wilton, R
- Jones, T W
- Lightwood, M S
- West, B J
- Ciborowski, J
- Ciesielski, R
- Nowak, R J
- Pawlak, J M
- Sztuk, J
- Tymieniecka, T
- Ukleja, A
- Ukleja, J
- Zarnecki, A F
- Adamus, M
- Plucinski, P
- Eisenberg, Y
- Gladilin, L K
- Hochman, D
- Karshon, U
- Kcira, D
- Lammers, S
- Li, L
- Reeder, D D
- Savin, A A
- Smith, W H
- Deshpande, A
- Dhawan, S
- Hughes, V W
- Straub, P B
- Bhadra, S
- Catterall, C D
- Fourletov, S
- Menary, S
- Soares, M
- Standage, J
- , ZEUS Collaborat
DOI Publisher
Elsevier BVAbstract
Dijet angular distributions of photoproduction events in which a D*(+/-) meson is produced in association with one of two energetic jets have been measured with the ZEUS detector at HERA, using an integrated luminosity of 120 pb(-1). Differential cross sections as a function of the angle between the charm-jet and the proton-beam direction in the dijet rest frame have been measured for samples enriched in direct or resolved photon events. The results are compared with predictions from leading order parton-shower Monte Carlo models and with next-to-leading-order QCD calculations. The angular distributions show clear evidence for the existence of charm originating from the photon. (C) 2003 Published by Elsevier B.V
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