Dijet angular distributions in photoproduction of charm at HERA

Sergei V. Chekanov, Malcolm Derrick, D. A. Krakauer, J.H. Loizides, S. Magill, Brian Musgrave, J. Repond, R. Yoshida, M.C.K. Mattingly, P. Antonioli

90 more authors

Giacomo Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, Giovanni Cara Romeo, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, S. De Pasquale, P. Giusti, GIUSEPPE IACOBUCCI, A. Margotti, R. Nania, F. Palmonari, A. Pesci, G. Sartorelli, A. Zichichi, G. Aghuzumtsyan, D. Bartsch, Ian C. Brock, S. Goers, H. Hartmann, E. Hilger, P. Irrgang, H.‐P. Jakob, A. Kappes, Uli F. Katz, O. M. Kind, U. Meyer, E. Paul, J. Rautenberg, R. Renner, A. Stifutkin, J. Tandler, K.C. Voss, Meng Wang, A. Weber, D. S. Bailey, Nicholas H Brook, J. E. Cole, B. Foster, G.P. Heath, G. P. Heath, S. Robins, Eduardo Rodrigues, J. Scott, R.J. Tapper, Matthew Wing, M. Capua, Anna Mastroberardino, Marco Schioppa, G. Susinno, J.Y. Kim, Y.K. Kim, J.H. Lee, I.T. Lim, M.Y. Pac, Allen Caldwell, M. Helbich, Xiang Liu, Bruce Rafael Mellado Garcia, Y. Ning, E. Paganis, Z. Ren, W. B. Schmidke, Frank J. Sciulli, J. J. Chwastowski, A. Eskreys, J. Figiel, Krystyna Olkiewicz, P. Stopa, L. Zawiejski, L. Adamczyk, T. Bołd, I. Grabowska-Bołd, Danuta Kisielewska, A.M. Kowal, M. Kowal, T. Z. Kowalski, M. Przybycień, L. Suszycki, D. Szuba, J. Szuba, A. Kotański, W. Słomiński, L. A. T. Bauerdick, U. Behrens

2003

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DOI 10.1016/s0370-2693(03)00752-4

Data confidence 70 medium

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Abstract

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.