Measurement of D ^sup ^ photoproduction at three different centre-of-mass energies at HERA

• Published in: The journal of high energy physics 2014-10, Vol.2014 (10), p.1
• Main Authors: Abramowicz, H, Abt, I, Adamus, M, Aushev, V, Barakbaev, A N, Bartosik, N, Bloch, I, Bokhonov, V, Boos, E G, Borras, K, Brugnera, R, Brzozowska, B, Bussey, P J, Chwastowski, J, Corradi, M, Corriveau, F, D'agostini, G, Dementiev, R K, Devenish, R C, E, Dolinska, G, Drugakov, V, Dusini, S, Ferrando, J, Figiel, J, Gach, G, Geiser, A, Gladilin, L K, Gogota, O, Golubkov, Yu A, Grzelak, G, Guzik, M, Hain, W, Hartner, G, Iga, Y, Iudin, A, Januschek, F, Kananov, S, Kaur, M, Kaur, P, Khein, L A, Klanner, R, Klein, U, Kononenko, O, Korol, Ie, Kovalchuk, N, Levchenko, B B, Levy, A, Lisovyi, M, Lohmann, W, Löhr, B, Lohrmann, E, Lukina, O Yu, Makarenko, I, Malka, J, Martin, J F, Mergelmeyer, S, Mohamad Idris, F, Mujkic, K, Nigro, A, Nobe, T, Nowak, R J, Olkiewicz, K, Onishchuk, Yu, Perlanski, W, Pokrovskiy, N S, Proskuryakov, A S, Raval, A, Roloff, P, Rubinsky, I, Ruspa, M, Samojlov, V, Schmidke, W B, Schneekloth, U, Schörner-sadenius, T, Schwartz, J, Shkola, O, Skillicorn, I O, Sola, V, Solano, A, Spiridonov, A, Stanco, L, Stewart, T P, Szuba, J, Tassi, E, Tokushuku, K, Tsurugai, T, Turcato, M, Verbytskyi, A, Walczak, R, Wan Abdullah, W A, T, Wichmann, K, Wolf, G, Yamada, S, Yamazaki, Y, Zakharchuk, N, Arnecki, A F, Zenaiev, O, Zhautykov, B O, Zhmak, N, Zotkin, D S
• Format: Article
• Language: English
• Subjects: High energy physics
• ISSN: 1029-8479
• DOI: 10.1007/JHEP10(2014)003

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Abstract The photoproduction of D ^sup ±^ mesons has been measured with the ZEUS detector at HERA at three different ep centre-of-mass energies, ..., of 318, 251 and 225 GeV. For each data set, D ^sup ±^ mesons were required to have transverse momentum, p ^sub T^^sup D^, and pseudo-rapidity, [eta] ^sup D^, in the ranges 1.9 < p ^sub T^^sup D^ < 20 GeV and |[eta] ^sup D^| < 1.6. The events were required to have a virtuality of the incoming photon, Q ^sup 2^, of less than 1 GeV^sup 2^. The dependence on ... was studied by normalising to the high-statistics measurement at ... GeV. This led to the cancellation of a number of systematic effects both in data and theory. Predictions from next-to-leading-order QCD describe the ... dependence of the data well.