Phys. Rev. D
78,
072001
(2008)
[18 pages]
Beauty photoproduction using decays into electrons at HERA
S. Chekanov et al. The ZEUS Collaboration
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S. Chekanov1, M. Derrick1, S. Magill1, B. Musgrave1, D. Nicholass1,*, J. Repond1, R. Yoshida1, M. C. K. Mattingly2, P. Antonioli3, G. Bari3, L. Bellagamba3, D. Boscherini3, A. Bruni3, G. Bruni3, F. Cindolo3, M. Corradi3, G. Iacobucci3, A. Margotti3, R. Nania3, A. Polini3, S. Antonelli4, M. Basile4, M. Bindi4, L. Cifarelli4, A. Contin4, S. De Pasquale4,†, G. Sartorelli4, A. Zichichi4, D. Bartsch5, I. Brock5, H. Hartmann5, E. Hilger5, H.-P. Jakob5, M. Jüngst5, O. M. Kind5,‡, A. E. Nuncio-Quiroz5, E. Paul5, U. Samson5, V. Schönberg5, R. Shehzadi5, M. Wlasenko5, N. H. Brook6, G. P. Heath6, J. D. Morris6, M. Capua7, S. Fazio7, A. Mastroberardino7, M. Schioppa7, G. Susinno7, E. Tassi7, J. Y. Kim8, Z. A. Ibrahim9, B. Kamaluddin9, W. A. T. Wan Abdullah9, Y. Ning10, Z. Ren10, F. Sciulli10, J. Chwastowski11, A. Eskreys11, J. Figiel11, A. Galas11, M. Gil11, K. Olkiewicz11, P. Stopa11, L. Zawiejski11, L. Adamczyk12, T. Bołd12, I. Grabowska-Bołd12, D. Kisielewska12, J. Łukasik12, M. Przybycień12, L. Suszycki12, A. Kotański13, W. Słomiński13, U. Behrens14, C. Blohm14, A. Bonato14, K. Borras14, R. Ciesielski14, N. Coppola14, S. Fang14, J. Fourletova14,§, A. Geiser14, P. Göttlicher14,**, J. Grebenyuk14, I. Gregor14, T. Haas14, W. Hain14, A. Hüttmann14, F. Januschek14, B. Kahle14, I. I. Katkov14, U. Klein14,††, U. Kötz14, H. Kowalski14, E. Lobodzinska14, B. Löhr14, R. Mankel14, I.-A. Melzer-Pellmann14, S. Miglioranzi14, A. Montanari14, T. Namsoo14, D. Notz14,‡‡, A. Parenti14, L. Rinaldi14,a, P. Roloff14, I. Rubinsky14, R. Santamarta14,b, U. Schneekloth14, A. Spiridonov14,c, D. Szuba14,d, J. Szuba14,e, T. Theedt14, G. Wolf14, K. Wrona14, A. G. Yagües Molina14, C. Youngman14, W. Zeuner14,‡‡, V. Drugakov15, W. Lohmann15, S. Schlenstedt15, G. Barbagli16, E. Gallo16, P. G. Pelfer17, A. Bamberger18, D. Dobur18, F. Karstens18, N. N. Vlasov18, P. J. Bussey19, A. T. Doyle19, W. Dunne19, M. Forrest19, M. Rosin19, D. H. Saxon19, I. O. Skillicorn19, I. Gialas20,f, K. Papageorgiu20, U. Holm21, R. Klanner21, E. Lohrmann21, P. Schleper21, T. Schörner-Sadenius21, J. Sztuk21, H. Stadie21, M. Turcato21, C. Foudas22, C. Fry22, K. R. Long22, A. D. Tapper22, T. Matsumoto23, K. Nagano23, K. Tokushuku23,g, S. Yamada23, Y. Yamazaki23,h, A. N. Barakbaev24, E. G. Boos24, N. S. Pokrovskiy24, B. O. Zhautykov24, V. Aushev25, M. Borodin25, I. Kadenko25, A. Kozulia25, V. Libov25, M. Lisovyi25, D. Lontkovskyi25, I. Makarenko25, Iu. Sorokin25, A. Verbytskyi25, O. Volynets25, D. Son26, J. de Favereau27, K. Piotrzkowski27, F. Barreiro28, C. Glasman28, M. Jimenez28, L. Labarga28, J. del Peso28, E. Ron28, M. Soares28, J. Terrón28, M. Zambrana28, F. Corriveau29, C. Liu29, J. Schwartz29, R. Walsh29, C. Zhou29, T. Tsurugai30, A. Antonov31, B. A. Dolgoshein31, D. Gladkov31, V. Sosnovtsev31, A. Stifutkin31, S. Suchkov31, R. K. Dementiev32, P. F. Ermolov32,s, L. K. Gladilin32, Yu. A. Golubkov32, L. A. Khein32, I. A. Korzhavina32, V. A. Kuzmin32, B. B. Levchenko32, O. Yu. Lukina32, A. S. Proskuryakov32, L. M. Shcheglova32, D. S. Zotkin32, I. Abt33, A. Caldwell33, D. Kollar33, B. Reisert33, W. B. Schmidke33, G. Grigorescu34, A. Keramidas34, E. Koffeman34, P. Kooijman34, A. Pellegrino34, H. Tiecke34, M. Vázquez34,‡‡, L. Wiggers34, N. Brümmer35, B. Bylsma35, L. S. Durkin35, A. Lee35, T. Y. Ling35, P. D. Allfrey36, M. A. Bell36, A. M. Cooper-Sarkar36, R. C. E. Devenish36, J. Ferrando36, B. Foster36, K. Korcsak-Gorzo36, K. Oliver36, A. Robertson36, C. Uribe-Estrada36, R. Walczak36, A. Bertolin37, F. Dal Corso37, S. Dusini37, A. Longhin37, L. Stanco37, P. Bellan38, R. Brugnera38, R. Carlin38, A. Garfagnini38, S. Limentani38, B. Y. Oh39, A. Raval39, J. Ukleja39, J. J. Whitmore39, Y. Iga40, G. D’Agostini41, G. Marini41, A. Nigro41, J. E. Cole42,i, J. C. Hart42, H. Abramowicz43,j, R. Ingbir43, S. Kananov43, A. Levy43, A. Stern43, M. Kuze44, J. Maeda44, R. Hori45, S. Kagawa45,k, N. Okazaki45, S. Shimizu45, T. Tawara45, R. Hamatsu46, H. Kaji46,l, S. Kitamura46,m, O. Ota46,n, Y. D. Ri46, M. Costa47, M. I. Ferrero47, V. Monaco47, R. Sacchi47, A. Solano47, M. Arneodo48, M. Ruspa48, S. Fourletov49,§, J. F. Martin49, T. P. Stewart49, S. K. Boutle50,f, J. M. Butterworth50, C. Gwenlan50, T. W. Jones50, J. H. Loizides50, M. Wing50,o, B. Brzozowska51, J. Ciborowski51,p, G. Grzelak51, P. Kulinski51, P. Łużniak51,q, J. Malka51,q, R. J. Nowak51, J. M. Pawlak51, T. Tymieniecka51, A. Ukleja51, A. F. Żarnecki51, M. Adamus52, P. Plucinski52,r, Y. Eisenberg53, D. Hochman53, U. Karshon53, E. Brownson54, T. Danielson54, A. Everett54, D. Kçira54, D. D. Reeder54, P. Ryan54, A. A. Savin54, W. H. Smith54, H. Wolfe54, S. Bhadra55, C. D. Catterall55, Y. Cui55, G. Hartner55, S. Menary55, U. Noor55, J. Standage55, and J. Whyte55 (The ZEUS Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439-4815, USA
2Andrews University, Berrien Springs, Michigan 49104-0380, USA
3INFN Bologna, Bologna, Italy
4University and INFN Bologna, Bologna, Italy
5Physikalisches Institut der Universität Bonn, Bonn, Germany
6H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
7Calabria University, Physics Department and INFN, Cosenza, Italy
8Chonnam National University, Kwangju, South Korea
9Jabatan Fizik, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
10Nevis Laboratories, Columbia University, Irvington on Hudson, New York 10027, USA
11The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland
12Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Cracow, Poland
13Department of Physics, Jagellonian University, Cracow, Poland
14Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
15Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany
16INFN Florence, Florence, Italy
17University and INFN Florence, Florence, Italy
18Fakultät für Physik der Universität Freiburg, Freiburg im Breisgau, Germany
19Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
20Department of Engineering in Management and Finance, University of Aegean, Greece
21Hamburg University, Institute of Experimental Physics, Hamburg, Germany
22Imperial College London, High Energy Nuclear Physics Group, London, United Kingdom
23Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan
24Institute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan
25Institute for Nuclear Research, National Academy of Sciences, Kiev and Kiev National University, Kiev, Ukraine
26Kyungpook National University, Center for High Energy Physics, Daegu, South Korea
27Institut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
28Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain
29Department of Physics, McGill University, Montréal, Québec, Canada H3A 2T8
30Meiji Gakuin University, Faculty of General Education, Yokohama, Japan
31Moscow Engineering Physics Institute, Moscow, Russia
32Moscow State University, Institute of Nuclear Physics, Moscow, Russia
33Max-Planck-Institut für Physik, München, Germany
34NIKHEF and University of Amsterdam, Amsterdam, Netherlands
35Physics Department, Ohio State University, Columbus, Ohio 43210, USA
36Department of Physics, University of Oxford, Oxford, United Kingdom
37INFN Padova, Padova, Italy
38Dipartimento di Fisica dell’ Università and INFN, Padova, Italy
39Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA
40Polytechnic University, Sagamihara, Japan
41Dipartimento di Fisica, Università ’La Sapienza’ and INFN, Rome, Italy
42Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, United Kingdom
43Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel
44Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
45Department of Physics, University of Tokyo, Tokyo, Japan
46Tokyo Metropolitan University, Department of Physics, Tokyo, Japan
47Università di Torino and INFN, Torino, Italy
48Università del Piemonte Orientale, Novara, and INFN, Torino, Italy
49Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7
50Physics and Astronomy Department, University College London, London, United Kingdom
51Warsaw University, Institute of Experimental Physics, Warsaw, Poland
52Institute for Nuclear Studies, Warsaw, Poland
53Department of Particle Physics, Weizmann Institute, Rehovot, Israel
54Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
55Department of Physics, York University, Ontario, Canada M3J 1P3
Received 6 June 2008; published 6 October 2008
Photoproduction of beauty quarks in events with two jets and an electron associated with one of the jets has been studied with the ZEUS detector at HERA using an integrated luminosity of 120 pb-1. The fractions of events containing b quarks, and also of events containing c quarks, were extracted from a likelihood fit using variables sensitive to electron identification as well as to semileptonic decays. Total and differential cross sections for beauty and charm production were measured and compared with next-to-leading-order QCD calculations and Monte Carlo models.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.78.072001
DOI:
10.1103/PhysRevD.78.072001
PACS:
13.60.−r, 13.20.Fc, 13.20.He, 14.65.Fy
*Also at University College London, UK. †Present address: University of Salerno, Italy. ‡Present address: Humboldt University, Berlin, Germany. §Present address: University of Bonn, Germany. **Present address: DESY group FEB, Hamburg, Germany. ††Present address: University of Liverpool, UK. ‡‡Present address: CERN, Geneva, Switzerland. aPresent address: Bologna University, Bologna, Italy. bPresent address: BayesForecast, Madrid, Spain. cAlso at Institut of Theoretical and Experimental Physics, Moscow, Russia. dAlso at INP, Cracow, Poland. eAlso at FPACS, AGH-UST, Cracow, Poland. fAlso at DESY, Germany. gAlso at University of Tokyo, Japan. hPresent address: Kobe University, Japan. iPresent address: University of Kansas, Lawrence, USA. jAlso at Max Planck Institute, Munich, Germany. kPresent address: KEK, Tsukuba, Japan. lPresent address: Nagoya University, Japan. mAlso Department of Radiological Science, Tokyo Metropolitan University, Japan. nPresent address: SunMelx Co. Ltd., Tokyo, Japan. oAlso at Hamburg University, Inst. of Exp. Physics. pAlso at Łódź University, Poland. qPresent address: Łódź University, Poland. rPresent address: Lund Universtiy, Lund, Sweden. sDeceased.
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