APS » Phys. Rev. D » Volume 78 » Issue 7

S. Chekanov,¹ M. Derrick,¹ S. Magill,¹ B. Musgrave,¹ D. Nicholass,¹ J. Repond,¹ R. Yoshida,¹ M. C. K. Mattingly,² P. Antonioli,³ G. Bari,³ L. Bellagamba,³ D. Boscherini,³ A. Bruni,³ G. Bruni,³ F. Cindolo,³ M. Corradi,³ G. Iacobucci,³ A. Margotti,³ R. Nania,³ A. Polini,³ S. Antonelli,⁴ M. Basile,⁴ M. Bindi,⁴ L. Cifarelli,⁴ A. Contin,⁴ S. De Pasquale,⁴ G. Sartorelli,⁴ A. Zichichi,⁴ D. Bartsch,⁵ I. Brock,⁵ H. Hartmann,⁵ E. Hilger,⁵ H.-P. Jakob,⁵ M. Jüngst,⁵ O. M. Kind,⁵ A. E. Nuncio-Quiroz,⁵ E. Paul,⁵ U. Samson,⁵ V. Schönberg,⁵ R. Shehzadi,⁵ M. Wlasenko,⁵ N. H. Brook,⁶ G. P. Heath,⁶ J. D. Morris,⁶ M. Capua,⁷ S. Fazio,⁷ A. Mastroberardino,⁷ M. Schioppa,⁷ G. Susinno,⁷ E. Tassi,⁷ J. Y. Kim,⁸ Z. A. Ibrahim,⁹ B. Kamaluddin,⁹ W. A. T. Wan Abdullah,⁹ Y. Ning,¹⁰ Z. Ren,¹⁰ F. Sciulli,¹⁰ J. Chwastowski,¹¹ A. Eskreys,¹¹ J. Figiel,¹¹ A. Galas,¹¹ M. Gil,¹¹ K. Olkiewicz,¹¹ P. Stopa,¹¹ L. Zawiejski,¹¹ L. Adamczyk,¹² T. Bold,¹² I. Grabowska-Bold,¹² D. Kisielewska,¹² J. Lukasik,¹² M. Przybycień,¹² L. Suszycki,¹² A. Kotański,¹³ W. Slomiński,¹³ U. Behrens,¹⁴ C. Blohm,¹⁴ A. Bonato,¹⁴ K. Borras,¹⁴ R. Ciesielski,¹⁴ N. Coppola,¹⁴ S. Fang,¹⁴ J. Fourletova,¹⁴ A. Geiser,¹⁴ P. Göttlicher,¹⁴ J. Grebenyuk,¹⁴ I. Gregor,¹⁴ T. Haas,¹⁴ W. Hain,¹⁴ A. Hüttmann,¹⁴ F. Januschek,¹⁴ B. Kahle,¹⁴ I. I. Katkov,¹⁴ U. Klein,¹⁴ U. Kötz,¹⁴ H. Kowalski,¹⁴ E. Lobodzinska,¹⁴ B. Löhr,¹⁴ R. Mankel,¹⁴ I.-A. Melzer-Pellmann,¹⁴ S. Miglioranzi,¹⁴ A. Montanari,¹⁴ T. Namsoo,¹⁴ D. Notz,¹⁴ A. Parenti,¹⁴ L. Rinaldi,¹⁴ P. Roloff,¹⁴ I. Rubinsky,¹⁴ R. Santamarta,¹⁴ U. Schneekloth,¹⁴ A. Spiridonov,¹⁴ D. Szuba,¹⁴ J. Szuba,¹⁴ T. Theedt,¹⁴ G. Wolf,¹⁴ K. Wrona,¹⁴ A. G. Yagües Molina,¹⁴ C. Youngman,¹⁴ W. Zeuner,¹⁴ V. Drugakov,¹⁵ W. Lohmann,¹⁵ S. Schlenstedt,¹⁵ G. Barbagli,¹⁶ E. Gallo,¹⁶ P. G. Pelfer,¹⁷ A. Bamberger,¹⁸ D. Dobur,¹⁸ F. Karstens,¹⁸ N. N. Vlasov,¹⁸ P. J. Bussey,¹⁹ A. T. Doyle,¹⁹ W. Dunne,¹⁹ M. Forrest,¹⁹ M. Rosin,¹⁹ D. H. Saxon,¹⁹ I. O. Skillicorn,¹⁹ I. Gialas,²⁰ K. Papageorgiu,²⁰ U. Holm,²¹ R. Klanner,²¹ E. Lohrmann,²¹ P. Schleper,²¹ T. Schörner-Sadenius,²¹ J. Sztuk,²¹ H. Stadie,²¹ M. Turcato,²¹ C. Foudas,²² C. Fry,²² K. R. Long,²² A. D. Tapper,²² T. Matsumoto,²³ K. Nagano,²³ K. Tokushuku,²³ S. Yamada,²³ Y. Yamazaki,²³ A. N. Barakbaev,²⁴ E. G. Boos,²⁴ N. S. Pokrovskiy,²⁴ B. O. Zhautykov,²⁴ V. Aushev,²⁵ M. Borodin,²⁵ I. Kadenko,²⁵ A. Kozulia,²⁵ V. Libov,²⁵ M. Lisovyi,²⁵ D. Lontkovskyi,²⁵ I. Makarenko,²⁵ Iu. Sorokin,²⁵ A. Verbytskyi,²⁵ O. Volynets,²⁵ D. Son,²⁶ J. de Favereau,²⁷ K. Piotrzkowski,²⁷ F. Barreiro,²⁸ C. Glasman,²⁸ M. Jimenez,²⁸ L. Labarga,²⁸ J. del Peso,²⁸ E. Ron,²⁸ M. Soares,²⁸ J. Terrón,²⁸ M. Zambrana,²⁸ F. Corriveau,²⁹ C. Liu,²⁹ J. Schwartz,²⁹ R. Walsh,²⁹ C. Zhou,²⁹ T. Tsurugai,³⁰ A. Antonov,³¹ B. A. Dolgoshein,³¹ D. Gladkov,³¹ V. Sosnovtsev,³¹ A. Stifutkin,³¹ S. Suchkov,³¹ R. K. Dementiev,³² P. F. Ermolov,³² L. K. Gladilin,³² Yu. A. Golubkov,³² L. A. Khein,³² I. A. Korzhavina,³² V. A. Kuzmin,³² B. B. Levchenko,³² O. Yu. Lukina,³² A. S. Proskuryakov,³² L. M. Shcheglova,³² D. S. Zotkin,³² I. Abt,³³ A. Caldwell,³³ D. Kollar,³³ B. Reisert,³³ W. B. Schmidke,³³ G. Grigorescu,³⁴ A. Keramidas,³⁴ E. Koffeman,³⁴ P. Kooijman,³⁴ A. Pellegrino,³⁴ H. Tiecke,³⁴ M. Vázquez,³⁴ L. Wiggers,³⁴ N. Brümmer,³⁵ B. Bylsma,³⁵ L. S. Durkin,³⁵ A. Lee,³⁵ T. Y. Ling,³⁵ P. D. Allfrey,³⁶ M. A. Bell,³⁶ A. M. Cooper-Sarkar,³⁶ R. C. E. Devenish,³⁶ J. Ferrando,³⁶ B. Foster,³⁶ K. Korcsak-Gorzo,³⁶ K. Oliver,³⁶ A. Robertson,³⁶ C. Uribe-Estrada,³⁶ R. Walczak,³⁶ A. Bertolin,³⁷ F. Dal Corso,³⁷ S. Dusini,³⁷ A. Longhin,³⁷ L. Stanco,³⁷ P. Bellan,³⁸ R. Brugnera,³⁸ R. Carlin,³⁸ A. Garfagnini,³⁸ S. Limentani,³⁸ B. Y. Oh,³⁹ A. Raval,³⁹ J. Ukleja,³⁹ J. J. Whitmore,³⁹ Y. Iga,⁴⁰ G. D'Agostini,⁴¹ G. Marini,⁴¹ A. Nigro,⁴¹ J. E. Cole,⁴² J. C. Hart,⁴² H. Abramowicz,⁴³ R. Ingbir,⁴³ S. Kananov,⁴³ A. Levy,⁴³ A. Stern,⁴³ M. Kuze,⁴⁴ J. Maeda,⁴⁴ R. Hori,⁴⁵ S. Kagawa,⁴⁵ N. Okazaki,⁴⁵ S. Shimizu,⁴⁵ T. Tawara,⁴⁵ R. Hamatsu,⁴⁶ H. Kaji,⁴⁶ S. Kitamura,⁴⁶ O. Ota,⁴⁶ Y. D. Ri,⁴⁶ M. Costa,⁴⁷ M. I. Ferrero,⁴⁷ V. Monaco,⁴⁷ R. Sacchi,⁴⁷ A. Solano,⁴⁷ M. Arneodo,⁴⁸ M. Ruspa,⁴⁸ S. Fourletov,⁴⁹ J. F. Martin,⁴⁹ T. P. Stewart,⁴⁹ S. K. Boutle,⁵⁰ J. M. Butterworth,⁵⁰ C. Gwenlan,⁵⁰ T. W. Jones,⁵⁰ J. H. Loizides,⁵⁰ M. Wing,⁵⁰ B. Brzozowska,⁵¹ J. Ciborowski,⁵¹ G. Grzelak,⁵¹ P. Kulinski,⁵¹ P. Luzniak,⁵¹ J. Malka,⁵¹ R. J. Nowak,⁵¹ J. M. Pawlak,⁵¹ T. Tymieniecka,⁵¹ A. Ukleja,⁵¹ A. F. Żarnecki,⁵¹ M. Adamus,⁵² P. Plucinski,⁵² Y. Eisenberg,⁵³ D. Hochman,⁵³ U. Karshon,⁵³ E. Brownson,⁵⁴ T. Danielson,⁵⁴ A. Everett,⁵⁴ D. Kçira,⁵⁴ D. D. Reeder,⁵⁴ P. Ryan,⁵⁴ A. A. Savin,⁵⁴ W. H. Smith,⁵⁴ H. Wolfe,⁵⁴ S. Bhadra,⁵⁵ C. D. Catterall,⁵⁵ Y. Cui,⁵⁵ G. Hartner,⁵⁵ S. Menary,⁵⁵ U. Noor,⁵⁵ J. Standage,⁵⁵ and J. Whyte⁵⁵

(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

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

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