Abstract
The photoproduction of D ∗± mesons has been measured with the ZEUS detector at HERA at three different ep centre-of-mass energies, \( \sqrt{s} \), of 318, 251 and 225 GeV. For each data set, D ∗± mesons were required to have transverse momentum, p D ∗ T , and pseudo-rapidity, η D∗, in the ranges 1.9 < p D ∗ T < 20 GeV and |η D∗| < 1.6. The events were required to have a virtuality of the incoming photon, Q 2, of less than 1 GeV2. The dependence on \( \sqrt{s} \) was studied by normalising to the high-statistics measurement at \( \sqrt{s}=318 \) 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 \( \sqrt{s} \) dependence of the data well.
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ArXiv ePrint: 1405.5068
Supported by the Italian National Institute for Nuclear Physics (INFN). (1, 2, 5, 23, 24, 26, 29, 30)
Supported by the German Federal Ministry for Education and Research (BMBF), under contract No. 05 H09PDF. (3)
Supported by HIR grant UM.C/625/1/HIR/149 and UMRG grants RU006-2013, RP012A-13AFR and RP012B-13AFR from Universiti Malaya, and ERGS grant ER004-2012A from the Ministry of Education, Malaysia. (6)
Supported by the National Science Centre under contract No. DEC-2012/06/M/ST2/00428. (7, 8)
Supported by the Science and Technology Facilities Council, UK. (12, 22, 32)
Supported by the German Federal Ministry for Education and Research (BMBF), under contract No. 05h09GUF, and the SFB 676 of the Deutsche Forschungsgemeinschaft (DFG). (13)
Supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and its grants for Scientific Research. (14, 19, 25, 28)
Supported by the Natural Sciences and Engineering Research Council of Canada (NSERC). (18, 31, 36)
Supported by RF Presidential grant N 3042.2014.2 for the Leading Scientific Schools and by the Russian Ministry of Education and Science through its grant for Scientific Research on High Energy Physics. (20)
Supported by the Israel Science Foundation. (27)
Also funded by Max Planck Institute for Physics, Munich, Germany. (R. Aggarwal, P. Kaur, I. Singh)
Partially supported by the Polish National Science Centre projects DEC-2011/01/B/ST2/03643 and DEC-2011/03/B/ST2/00220. (W. Slominski)
Supported by the Alexander von Humboldt Foundation. (V. Myronenko, O. Turkot, K. Wichmann)
Alexander von Humboldt Professor; also at DESY and University of Oxford. (B. Foster)
Supported by DESY, Germany. (V. Aushev, Y. Aushev, V. Bokhonov, N. Zhmak)
Member of National Technical University of Ukraine, Kyiv Polytechnic Institute, Kyiv, Ukraine. (Y. Aushev, A. Iudin, R. Shevchenko)
Member of National University of Kyiv - Mohyla Academy, Kyiv, Ukraine. (N. Kovalchuk, O. Shkola, A. Trofymov, N. Zakharchuk)
Also at Max Planck Institute for Physics, Munich, Germany, External Scientific Member. (H. Abramowicz)
Also supported by DESY. (M. Wing)
Member of Lódz University, Poland. (W. Perlanski)
Deceased. (A.S. Proskuryakov)
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The ZEUS collaboration., Abramowicz, H., Abt, I. et al. Measurement of D ∗ photoproduction at three different centre-of-mass energies at HERA. J. High Energ. Phys. 2014, 3 (2014). https://doi.org/10.1007/JHEP10(2014)003
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DOI: https://doi.org/10.1007/JHEP10(2014)003