https://doi.org/10.1140/epjc/s10052-007-0257-z
Regular Article - Experimental Physics
Measurement of open beauty production at HERA in the D*μ final state
1
Argonne National Laboratory, Argonne, Illinois, 60439-4815, USA
2
Andrews University, Berrien Springs, Michigan, 49104-0380, USA
3
Institut für Physik, Humboldt-Universität zu Berlin, Berlin, Germany
4
University and INFN Bologna, Bologna, Italy
5
Physikalisches Institut, Universität Bonn, Bonn, Germany
6
H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
7
Physics Department and INFN, Calabria University, Cosenza, Italy
8
Chonnam National University, Kwangju, South Korea
9
Jabatan Fizik, Universiti Malaya, 50603, Kuala Lumpur, Malaysia
10
Nevis Laboratories, Columbia University, Irvington on Hudson, New York, 10027, USA
11
The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland
12
Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Cracow, Poland
13
Department of Physics, Jagellonian University, Cracow, Poland
14
Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
15
Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany
16
University and INFN, Florence, Italy
17
Fakultät für Physik, Universität Freiburg i.Br., Freiburg i.Br., Germany
18
Department of Physics and Astronomy, University of Glasgow, Glasgow, UK
19
Department of Engineering in Management and Finance, Univ. of Aegean, Mytilene, Greece
20
Institute of Experimental Physics, Hamburg University, Hamburg, Germany
21
High Energy Nuclear Physics Group, Imperial College London, London, UK
22
Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan
23
Institute of Physics and Technology, Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan
24
Center for High Energy Physics, Kyungpook National University, Daegu, South Korea
25
Institut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
26
Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain
27
Department of Physics, McGill University, Montréal, Québec, H3A 2T8, Canada
28
Faculty of General Education, Meiji Gakuin University, Yokohama, Japan
29
Moscow Engineering Physics Institute, Moscow, Russia
30
Institute of Nuclear Physics, Moscow State University, Moscow, Russia
31
Max-Planck-Institut für Physik, München, Germany
32
NIKHEF and University of Amsterdam, Amsterdam, Netherlands
33
Physics Department, Ohio State University, Columbus, Ohio, 43210, USA
34
Department of Physics, University of Oxford, Oxford, UK
35
Dipartimento di Fisica, Università and INFN, Padova, Italy
36
Department of Physics, Pennsylvania State University, University Park, Pennsylvania, 16802, USA
37
Polytechnic University, Sagamihara, Japan
38
Dipartimento di Fisica, Università ‘La Sapienza’ and INFN, Rome, Italy
39
Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK
40
Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel-Aviv University, Tel-Aviv, Israel
41
Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
42
Department of Physics, University of Tokyo, Tokyo, Japan
43
Department of Physics, Tokyo Metropolitan University, Tokyo, Japan
44
Università di Torino and INFN, Torino, Italy
45
Università del Piemonte Orientale, Novara, and INFN, Torino, Italy
46
Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, Canada
47
Physics and Astronomy Department, University College London, London, UK
48
Institute of Experimental Physics, Warsaw University, Warsaw, Poland
49
Institute for Nuclear Studies, Warsaw, Poland
50
Department of Particle Physics, Weizmann Institute, Rehovot, Israel
51
Department of Physics, University of Wisconsin, Madison, Wisconsin, 53706, USA
52
Department of Physics, York University, Toronto, Ontario, M3J 1P3, Canada
* e-mail: gallo@mail.desy.de
Received:
26
September
2006
Revised:
31
January
2007
Published online:
15
March
2007
The production of beauty quarks with a and a muon in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb-1. Low transverse-momentum thresholds for the muon and D* meson allow for a measurement of beauty production closer to the production threshold than previous measurements. The beauty signal was extracted using the charge correlations and angular distributions of the muon with respect to the D* meson. Cross sections for photoproduction and deep inelastic scattering are somewhat higher than, but compatible with, next-to-leading-order QCD predictions, and compatible with other measurements.
© Springer-Verlag Berlin Heidelberg, 2007