Inclusive photoproduction of D*± in ep collisions at HERA has been measured with the ZEUS detector for photon-proton centre of mass energies in the range 115 < W < 280 GeV and photon virtuality Q2 < 4 GeV2. The cross section σ → D*X integrated over the kinematic region pDz.ast; ⊥ > 3 GeV and -1.5 < ηD* < 1.0 is (10.6 ± 1.7(stat.) ± 1.6 1.3 (syst.)) nb. Differential cross sections as functions of pD* ⊥, ηD* and W are given. The data are compared with two next-to-leading order perturbative QCD predictions. For a calculation using a massive charm scheme the predicted cross sections are smaller than the measured ones. A recent calculation using a massless charm scheme is in agreement with the data.
|Number of pages||15|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 1997 May 22|
Bibliographical noteFunding Information:
’ Also at IROE Florence, Italy. 2 Now at Univ. of Salerno and INFN Napoli, Italy. 3 Now at Univ. of Crete, Greece. 4 Supported by Worldlab, Lausanne, Switzerland. 5 Now OPAL. 6 Retired. 7 Also at University of Torino and Alexander von Humboldt Fellow. * Now at Dongshin University, Naju, Korea. g Also at DESY and Alexander von Humboldt Fellow. lo Alfred P Sloan Foundation Fellow. 11S upported by an EC fellowship number ERBFMBICT 950172. l2 Visitor from Florida State University. l3 Now at ALCATEL Mobile Communication GmbH, Stuttgart. l4 Now at DESY Computer Center. l5 Supported by European Community Program PRAXIS XXI. l6 Now at DESY-Group FDET. l7 Visitor from Kyungpook National University, Taegu, Korea, partially supported by DESY. I8 Now at Fermi National Accelerator Laboratory (FNAL), Batavia, IL, USA. lg Now at Siemens A.G., Munich. 2oN ow at NORCOM Infosystems, Hamburg. 21N ow at ATLAS Collaboration, Univ. of Munich. 22N ow at Clinical Operational Research Unit, University College, London. 23O n leave from MSU, supported by the GIF, contract 1-0444-176.07195. 24N ow a self-employed consultant. 25S upported by an EC fellowship. 26P PARC Post-doctoral Fellow. ” Now at Conduit Communications Ltd., London, UK. 28N ow at Departmento f Energy, Washington. 29N ow at Lawrence Berkeley Laboratory, Berkeley. 3oN ow at Yale University, New Haven, CT. s1 Supported by a MINERVA Fellowship. 32P artially supportedb y DESY. 33N ow at CERN. 34P resent address:T okyo Metropolitan College of Allied Medical Sciences, Tokyo 116, Japan. 35S upported by the Polish State Committee for Scientific Research, grant No. 2PO3BO9308. 36S upported by the Polish State Committee for Scientific Research, grant No. 2PO3B09208. 37S upported by the Natural Sciences and Engineering Research Council of Canada (NSERC) . 38S upported by the FCAR of Quebec, Canada. a9S upported by the German Federal Ministry for Education and Science, Research and Technology (BMBF), under contract num-
bers 057BN19P, 057FRlPP, 057HH19P, 057HH29P, 057SI751. 4o Supportedb y the MINERVA Gesellschaft Wr Forschung GmbH, the German Israeli Foundation, and the U.S.-Israel Binational Science Foundation. 4’ Supported by the German Israeli Foundation, and by the Israel Academy of Science. 42S upported by the Italian National Institute for Nuclear Physics (INFN). 43S upported by the Japanese Ministry of Education, Science and Culture (the Monbusho) and its grants for Scientific Research. 44S upported by the Korean Ministry of Education and Korea Science and Engineering Foundation. 45S upported by the NetherlandsF oundation for Research on Matter (FOM). 46S upported by the Polish State Committee for Scientific Research, grant 115/E-343/SPUB/PO3/120/96. 47S upportedb y the Polish State Committeef or Scientific Research (grant No. 2 P03B 083 08) and Foundation for Polish-German Collaboration. 48P artially supported by the German Federal Ministry for E!duca-tion and Science, Research and Technology (BMBF) 49S upported by the German Federal Ministry for Education and Science, Research and Technology (BMBF), and the Fund of Fundamental Research of Russian Ministry of Science and Education and by INTAS-Grant No. 93-63. H, Supported by the Spanish Ministry of Education and Science through funds provided by CICYT. 51S upported by the Particle Physic? and Astronomy Research Council. 52S upported by the US Department of Energy. 53S upported by the US National Science Foundation.
ASJC Scopus subject areas
- Nuclear and High Energy Physics