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Abstract
Beauty production in deep inelastic scattering with events in which a muon and a jet are observed in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb−1. The fraction of events with beauty quarks in the data was determined using the distribution of the transverse momentum of the muon relative to the jet. The cross section for beauty production was measured in the kinematic range of photon virtuality, Q2>2 GeV2, and inelasticity, 0.05<y<0.7, with the requirement of a muon and a jet. Total and differential cross sections are presented and compared to QCD predictions. The beauty contribution to the structure function F2 was extracted and is compared to theoretical predictions.
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1 Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel
2 Max-Planck-Institut für Physik, München, Germany
3 Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Cracow, Poland
4 Institute for Nuclear Studies, Warsaw, Poland
5 Department of Physics, Panjab University, Chandigarh, India
6 University and INFN Bologna, Bologna, Italy
7 INFN Bologna, Bologna, Italy
8 Moscow Engineering Physics Institute, Moscow, Russia
9 Università del Piemonte Orientale, Novara, and INFN, Torino, Italy
10 Institute for Nuclear Research, National Academy of Sciences, and Kiev National University, Kiev, Ukraine
11 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
12 Fakultät für Physik der Universität Freiburg i.Br., Freiburg i.Br., Germany
13 Institute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan
14 INFN Florence, Florence, Italy
15 Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain
16 Physikalisches Institut der Universität Bonn, Bonn, Germany
17 INFN Padova, Padova, Italy
18 Department of Physics, York University, Ontario, Canada
19 Physics and Astronomy Department, University College London, London, UK
20 Department of Physics, University of Wisconsin, Madison, WI, USA
21 Dipartimento di Fisica dell’ Università and INFN, Padova, Italy
22 Physics Department, Ohio State University, Columbus, OH, USA
23 Institute of Experimental Physics, Warsaw University, Warsaw, Poland
24 Department of Physics and Astronomy, University of Glasgow, Glasgow, UK
25 Physics Department and INFN, Calabria University, Cosenza, Italy
26 Argonne National Laboratory, Argonne, IL, USA
27 The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland
28 Department of Physics, University of Oxford, Oxford, UK
29 Department of Physics, McGill University, Montréal, Québec, Canada
30 Università di Torino and INFN, Torino, Italy
31 Dipartimento di Fisica, Università ‘La Sapienza’ and INFN, Rome, Italy
32 Institut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
33 Institute of Nuclear Physics, Moscow State University, Moscow, Russia
34 Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany
35 Department of Particle Physics, Weizmann Institute, Rehovot, Israel
36 Department of Physics, University of Toronto, Toronto, Ontario, Canada
37 Department of Engineering in Management and Finance, Univ. of the Aegean, Chios, Greece
38 NIKHEF and University of Amsterdam, Amsterdam, Netherlands
39 Department of Physics, Tokyo Metropolitan University, Tokyo, Japan
40 Rutherford Appleton Laboratory, Oxon, UK
41 Institute of Exp. Physics, Hamburg University, Hamburg, Germany
42 Department of Physics, University of Tokyo, Tokyo, Japan
43 Jabatan Fizik, Universiti Malaya, Kuala Lumpur, Malaysia
44 Polytechnic University, Sagamihara, Japan
45 Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
46 Institute for Universe and Elementary Particles, Chonnam National University, Kwangju, South Korea
47 Department of Physics, Jagellonian University, Cracow, Poland
48 High Energy Nuclear Physics Group, Imperial College London, London, UK
49 Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan
50 Andrews University, Berrien Springs, MI, USA
51 H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
52 Nevis Laboratories, Columbia University, Irvington on Hudson, NY, USA
53 Department of Physics, Pennsylvania State University, University Park, PA, USA
54 University and INFN Florence, Florence, Italy
55 Center for High Energy Physics, Kyungpook National University, Daegu, South Korea
56 Faculty of General Education, Meiji Gakuin University, Yokohama, Japan