Abstract

Measurements of cross sections for beauty and charm events with dijets and a muon in the photoproduction regime at HERA are presented. The data were collected with the H1 detector and correspond to an integrated luminosity of 179 pb−1. Events with dijets of transverse momentum \(P_{T}^{\mathrm{jet}1}> 7\ \mbox{GeV}\) and \(P_{T}^{\mathrm{jet}2}> 6\ \mbox{GeV}\) in the pseudorapidity range −1.5<ηjet<2.5 in the laboratory frame are selected in the kinematic region of photon virtuality Q2<2.5 GeV2 and inelasticity 0.2<y<0.8. One of the two selected jets must be associated to a muon with \(P_{T}^{\mu} > 2.5\ \mbox{GeV}\) in the pseudorapidity range −1.3<ημ<1.5. The fractions of beauty and charm events are determined using the impact parameters of the muon tracks with respect to the primary vertex and their transverse momentum relative to the axis of the associated jet. Both variables are reconstructed using the H1 vertex detector. The measurements are in agreement with QCD predictions at leading and next-to-leading order.

Details

Title
Measurement of beauty and charm photoproduction using semi-muonic decays in dijet events at HERA
Author
Aaron, F D 1 ; Alexa, C 1 ; Andreev, V 2 ; Backovic, S 3 ; Baghdasaryan, A 4 ; Baghdasaryan, S 4 ; Barrelet, E 5 ; Bartel, W 6 ; Begzsuren, K 7 ; Belousov, A 2 ; Belov, P 6 ; Bizot, J C 8 ; Boudry, V 9 ; Bozovic-Jelisavcic, I 10 ; Bracinik, J 11 ; Brandt, G 6 ; Brinkmann, M 6 ; Brisson, V 8 ; Britzger, D 6 ; Bruncko, D 12 ; Bunyatyan, A 13 ; Bylinkin, A 14 ; Bystritskaya, L 14 ; Campbell, A J 6 ; Cantun Avila, K B 15 ; Ceccopieri, F 16 ; Cerny, K 17 ; Cerny, V 12 ; Chekelian, V 18 ; Contreras, J G 15 ; Coughlan, J A 19 ; Cvach, J 20 ; Dainton, J B 21 ; Daum, K 22 ; Delcourt, B 8 ; Delvax, J 16 ; De Wolf, E A 16 ; Diaconu, C 23 ; Dobre, M 24 ; Dodonov, V 25 ; Dossanov, A 26 ; Dubak, A 3 ; Eckerlin, G 6 ; Egli, S 27 ; Eliseev, A 2 ; Elsen, E 6 ; Favart, L 16 ; Fedotov, A 14 ; Felst, R 6 ; Feltesse, J 28 ; Ferencei, J 12 ; D-J Fischer 6 ; Fleischer, M 6 ; Fomenko, A 2 ; Gabathuler, E 21 ; Gayler, J 6 ; Ghazaryan, S 6 ; Glazov, A 6 ; Goerlich, L 29 ; Gogitidze, N 2 ; Gouzevitch, M 6 ; Grab, C 30 ; Grebenyuk, A 6 ; Greenshaw, T 21 ; Grindhammer, G 18 ; Habib, S 6 ; Haidt, D 6 ; Henderson, R C W 31 ; Hennekemper, E 32 ; Henschel, H 33 ; Herbst, M 32 ; Herrera, G 34 ; Hildebrandt, M 27 ; Hiller, K H 33 ; Hoffmann, D 23 ; Horisberger, R 27 ; Hreus, T 16 ; Huber, F 35 ; Jacquet, M 8 ; Janssen, X 16 ; Jönsson, L 36 ; Jung, H 37 ; Kapichine, M 38 ; Kenyon, I R 11 ; Kiesling, C 18 ; Klein, M 21 ; Kleinwort, C 6 ; Kluge, T 21 ; Kogler, R 24 ; Kostka, P 33 ; Krämer, M 6 ; Kretzschmar, J 21 ; Krüger, K 32 ; Landon, M P J 39 ; Lange, W 33 ; Laštovička-Medin, G 3 ; Laycock, P 21 ; Lebedev, A 2 ; Lendermann, V 32 ; Levonian, S 6 ; Lipka, K 6 ; List, B 6 ; List, J 6 ; Lobodzinski, B 6 ; Lopez-Fernandez, R 34 ; Lubimov, V 14 ; Malinovski, E 2 ; H-U, Martyn 40 ; Maxfield, S J 21 ; Mehta, A 21 ; Meyer, A B 6 ; Meyer, H 22 ; Meyer, J 6 ; Mikocki, S 29 ; Milcewicz-Mika, I 29 ; Moreau, F 9 ; Morozov, A 38 ; Morris, J V 19 ; Müller, K 41 ; Naumann, Th 33 ; Newman, P R 11 ; Niebuhr, C 6 ; Nikitin, D 38 ; Nowak, G 29 ; Nowak, K 24 ; Olsson, J E 6 ; Ozerov, D 6 ; Pahl, P 6 ; Palichik, V 38 ; Panagoulias, I 6 ; Pandurovic, M 10 ; Papadopoulou, Th 6 ; Pascaud, C 8 ; Patel, G D 21 ; Perez, E 28 ; Petrukhin, A 6 ; Picuric, I 3 ; Pirumov, H 35 ; Pitzl, D 6 ; Plačakytė, R 6 ; Pokorny, B 17 ; Polifka, R 17 ; Povh, B 25 ; Radescu, V 6 ; Raicevic, N 3 ; Ravdandorj, T 7 ; Reimer, P 20 ; Rizvi, E 39 ; Robmann, P 41 ; Roosen, R 16 ; Rostovtsev, A 14 ; Rotaru, M 1 ; Ruiz Tabasco, J E 15 ; Rusakov, S 2 ; Šálek, D 17 ; Sankey, D P C 19 ; Sauter, M 35 ; Sauvan, E 23 ; Schmitt, S 6 ; Schoeffel, L 28 ; Schöning, A 35 ; H-C Schultz-Coulon 32 ; Sefkow, F 6 ; Shtarkov, L N 2 ; Shushkevich, S 6 ; Sloan, T 31 ; Soloviev, Y 42 ; Sopicki, P 29 ; South, D 6 ; Spaskov, V 38 ; Specka, A 9 ; Staykova, Z 16 ; Steder, M 6 ; Stella, B 43 ; Stoicea, G 1 ; Straumann, U 41 ; Sykora, T 44 ; Thompson, P D 11 ; Tran, T H 8 ; Traynor, D 39 ; Truöl, P 41 ; Tsakov, I 45 ; Tseepeldorj, B 7 ; Turnau, J 29 ; Valkárová, A 17 ; Vallée, C 23 ; P Van Mechelen 16 ; Vazdik, Y 2 ; Wegener, D 46 ; Wünsch, E 6 ; Žáček, J 17 ; Zálešák, J 20 ; Zhang, Z 8 ; Zhokin, A 14 ; Žlebčík, R 17 ; Zohrabyan, H 4 ; Zomer, F 8 

1  National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania 
2  Lebedev Physical Institute, Moscow, Russia 
3  Faculty of Science, University of Montenegro, Podgorica, Montenegro 
4  Yerevan Physics Institute, Yerevan, Armenia 
5  LPNHE, Université Pierre et Marie Curie Paris 6, Université Denis Diderot Paris 7, CNRS/IN2P3, Paris, France 
6  DESY, Hamburg, Germany 
7  Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia 
8  LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France 
9  LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France 
10  Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia 
11  School of Physics and Astronomy, University of Birmingham, Birmingham, UK 
12  Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic 
13  Max-Planck-Institut für Kernphysik, Heidelberg, Germany; Yerevan Physics Institute, Yerevan, Armenia 
14  Institute for Theoretical and Experimental Physics, Moscow, Russia 
15  Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, México 
16  Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 
17  Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic 
18  Max-Planck-Institut für Physik, München, Germany 
19  STFC, Rutherford Appleton Laboratory, Didcot, Oxfordshire, UK 
20  Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic 
21  Department of Physics, University of Liverpool, Liverpool, UK 
22  Fachbereich C, Universität Wuppertal, Wuppertal, Germany 
23  CPPM, Aix-Marseille Univ, CNRS/IN2P3, Marseille, France 
24  Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 
25  Max-Planck-Institut für Kernphysik, Heidelberg, Germany 
26  Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany; Max-Planck-Institut für Physik, München, Germany 
27  Paul Scherrer Institut, Villigen, Switzerland 
28  CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, France 
29  Institute for Nuclear Physics, Cracow, Poland 
30  Institut für Teilchenphysik, ETH, Zürich, Switzerland 
31  Department of Physics, University of Lancaster, Lancaster, UK 
32  Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany 
33  DESY, Zeuthen, Germany 
34  Departamento de Fisica, CINVESTAV IPN, México City, México 
35  Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany 
36  Physics Department, University of Lund, Lund, Sweden 
37  DESY, Hamburg, Germany; Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 
38  Joint Institute for Nuclear Research, Dubna, Russia 
39  School of Physics and Astronomy, Queen Mary, University of London, London, UK 
40  I. Physikalisches Institut der RWTH, Aachen, Germany 
41  Physik-Institut der Universität Zürich, Zürich, Switzerland 
42  DESY, Hamburg, Germany; Lebedev Physical Institute, Moscow, Russia 
43  Dipartimento di Fisica, Università di Roma Tre and INFN Roma 3, Roma, Italy 
44  Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic; Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 
45  Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria 
46  Institut für Physik, TU Dortmund, Dortmund, Germany 
Pages
1-19
Publication year
2012
Publication date
Jun 2012
Publisher
Springer Nature B.V.
ISSN
14346044
e-ISSN
14346052
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1140/epjc/s10052-012-2047-5
ProQuest document ID
2294188060
Copyright
The European Physical Journal C is a copyright of Springer, (2012). All Rights Reserved., © 2012. This work is published under https://creativecommons.org/licenses/by/2.0 (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.