https://doi.org/10.1140/epjc/s10052-012-2148-1
Regular Article - Experimental Physics
Measurement of beauty photoproduction near threshold using di-electron events with the H1 detector at HERA
1
I. Physikalisches Institut der RWTH, Aachen, Germany
2
Vinca Institute of Nuclear Sciences, University of Belgrade, 1100, Belgrade, Serbia
3
School of Physics and Astronomy, University of Birmingham, Birmingham, UK
4
Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium
5
Universiteit Antwerpen, Antwerpen, Belgium
6
National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania
7
Rutherford Appleton Laboratory, STFC, Didcot, Oxfordshire, UK
8
Institute for Nuclear Physics, Cracow, Poland
9
Institut für Physik, TU Dortmund, Dortmund, Germany
10
Joint Institute for Nuclear Research, Dubna, Russia
11
CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, France
12
DESY, Hamburg, Germany
13
Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
14
Max-Planck-Institut für Kernphysik, Heidelberg, Germany
15
Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
16
Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
17
Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
18
Department of Physics, University of Lancaster, Lancaster, UK
19
Department of Physics, University of Liverpool, Liverpool, UK
20
School of Physics and Astronomy, Queen Mary, University of London, London, UK
21
Physics Department, University of Lund, Lund, Sweden
22
CPPM, Aix-Marseille Univ, CNRS/IN2P3, 13288, Marseille, France
23
Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico
24
Departamento de Fisica, CINVESTAV IPN, México City, Mexico
25
Institute for Theoretical and Experimental Physics, Moscow, Russia
26
Lebedev Physical Institute, Moscow, Russia
27
Max-Planck-Institut für Physik, München, Germany
28
LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
29
LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France
30
LPNHE, Université Pierre et Marie Curie Paris 6, Université Denis Diderot Paris 7, CNRS/IN2P3, Paris, France
31
Faculty of Science, University of Montenegro, Podgorica, Montenegro
32
Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
33
Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
34
Dipartimento di Fisica, Università di Roma Tre and INFN Roma 3, Roma, Italy
35
Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
36
Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
37
Paul Scherrer Institut, Villigen, Switzerland
38
Fachbereich C, Universität Wuppertal, Wuppertal, Germany
39
Yerevan Physics Institute, Yerevan, Armenia
40
DESY, Zeuthen, Germany
41
Institut für Teilchenphysik, ETH, Zürich, Switzerland
42
Physik-Institut der Universität Zürich, Zürich, Switzerland
* e-mail: kruegerk@mail.desy.de
Received:
19
June
2012
Revised:
10
August
2012
Published online:
3
October
2012
The cross section for 
in photoproduction is measured with the H1 detector at the ep-collider HERA. The decay channel 
is selected by identifying the semi-electronic decays of the b-quarks. The total production cross section is measured in the kinematic range given by the photon virtuality Q
2≤1 GeV2, the inelasticity 0.05≤y≤0.65 and the pseudorapidity of the b-quarks 
. The differential production cross section is measured as a function of the average transverse momentum of the beauty quarks 〈P
T
(b)〉 down to the threshold. The results are compared to next-to-leading-order QCD predictions.
© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica, 2012
