Measurement of heavy-quark jet photoproduction at HERA

H. Abramowicz,I. Abt,L. Adamczyk, M. Adamus,R. Aggarwal,S. Antonelli,P. Antonioli,A. Antonov,M. Arneodo,V. Aushev,Y. Aushev, O. Bachynska, A. Bamberger,A. N. Barakbaev, G. Barbagli,G. Bari,F. Barreiro,N. Bartosik,D. Bartsch,M. Basile, O. Behnke, J. Behr, U. Behrens,L. Bellagamba, A. Bertolin,S. Bhadra,M. Bindi,C. Blohm, V. Bokhonov,T. Bołd, O. Bolilyi,K. Bondarenko, E. G. Boos,K. Borras, D. Boscherini,D. Bot, I. Brock, E. Brownson, R. Brugnera, N. Brümmer,A. Bruni,G. Bruni,B. Brzozowska, P. J. Bussey, B. Bylsma,A. Caldwell,M. Capua,R. Carlin,C. D. Catterall,S. Chekanov,J. Chwastowski,J. Ciborowski,R. Ciesielski,L. Cifarelli,F. Cindolo,A. Contin,A. M. Cooper-Sarkar, N. Coppola,M. Corradi,F. Corriveau,M. Costa,G. D’Agostini,F. Dal Corso,J. del Peso, R. K. Dementiev,S. De Pasquale, M. Derrick,R. C. E. Devenish, D. Dobur,B. A. Dolgoshein,G. Dolinska,A. T. Doyle,V. Drugakov,L. S. Durkin,S. Dusini,Y. Eisenberg,P. F. Ermolov,A. Eskreys,S. Fang,S. Fazio,J. Ferrando,M. I. Ferrero,J. Figiel,M. Forrest,B. Foster,S. Fourletov, G. Gach, A. Galas, E. Gallo,A. Garfagnini, A. Geiser,I. Gialas,L. K. Gladilin,D. Gladkov,C. Glasman,O. Gogota,Yu. A. Golubkov,P. Göttlicher,I. Grabowska-Bołd,J. Grebenyuk,I. Gregor, G. Grigorescu,G. Grzelak,O. Gueta,C. Gwenlan,T. Haas, W. Hain,R. Hamatsu, J. C. Hart,H. Hartmann, G. Hartner,E. Hilger,D. Hochman,R. Hori,K. Horton, A. Hüttmann, Z. A. Ibrahim,Y. Iga,R. Ingbir, M. Ishitsuka,H.-P. Jakob,F. Januschek,M. Jimenez,T. W. Jones,M. Jüngst,I. Kadenko, B. Kahle,B. Kamaluddin,S. Kananov,T. Kanno,U. Karshon, F. Karstens,I. I. Katkov, M. Kaur,P. Kaur,A. Keramidas, L. A. Khein,J. Y. Kim, D. Kisielewska,S. Kitamura,R. Klanner,U. Klein, E. Koffeman,P. Kooijman, I. Korol,I. A. Korzhavina,A. Kotański,U. Kötz,H. Kowalski,P. Kulinski, O. Kuprash,M. Kuze,A. Lee,B. B. Levchenko,A. Levy,V. Libov,S. Limentani, T. Y. Ling,M. Lisovyi,E. Lobodzinska, W. Lohmann, B. Löhr,E. Lohrmann, K. R. Long,A. Longhin, D. Lontkovskyi,O. Yu. Lukina, P. Łużniak,J. Maeda,S. Magill,I. Makarenko,J. Malka, R. Mankel, A. Margotti,G. Marini,J. F. Martin,A. Mastroberardino, M. C. K. Mattingly, I.-A. Melzer-Pellmann, S. Mergelmeyer, S. Miglioranzi,F. Mohamad Idris, V. Monaco, A. Montanari, J. D. Morris,K. Mujkic,B. Musgrave,K. Nagano,T. Namsoo, R. Nania,D. Nicholass,A. Nigro,Y. Ning, T. Nobe,U. Noor,D. Notz,R. J. Nowak,A. E. Nuncio-Quiroz,B. Y. Oh,N. Okazaki,K. Oliver, K. Olkiewicz, Yu. Onishchuk,K. Papageorgiu, A. Parenti,E. Paul, J. M. Pawlak,B. Pawlik,P. G. Pelfer,A. Pellegrino,W. Perlanski,H. Perrey,K. Piotrzkowski, P. Plucinski,N. S. Pokrovskiy,A. Polini, A. S. Proskuryakov,M. Przybycień, A. Raval,D. D. Reeder,B. Reisert,Z. Ren,J. Repond,Y. D. Ri,A. Robertson,P. Roloff,E. Ron,I. Rubinsky, M. Ruspa, R. Sacchi,A. Salii,U. Samson, G. Sartorelli,A. A. Savin,D. H. Saxon, M. Schioppa,S. Schlenstedt, P. Schleper,W. B. Schmidke,U. Schneekloth,V. Schönberg, T. Schörner-Sadenius,J. Schwartz,F. Sciulli,L. M. Shcheglova, R. Shehzadi, S. Shimizu,I. Singh,I. O. Skillicorn,W. Słomiński,W. H. Smith,V. Sola, A. Solano,D. Son,V. Sosnovtsev, A. Spiridonov, H. Stadie,L. Stanco,A. Stern,T. P. Stewart,A. Stifutkin,P. Stopa, S. Suchkov,G. Susinno,L. Suszycki,J. Sztuk-Dambietz,D. Szuba,J. Szuba,A. D. Tapper,E. Tassi,J. Terrón,T. Theedt,H. Tiecke, K. Tokushuku,O. Tomalak,J. Tomaszewska,T. Tsurugai, M. Turcato,T. Tymieniecka,C. Uribe-Estrada,M. Vázquez, A. Verbytskyi, O. Viazlo, N. N. Vlasov, O. Volynets, R. Walczak,W. A. T. Wan Abdullah,J. J. Whitmore,J. Whyte,L. Wiggers, M. Wing,M. Wlasenko,G. Wolf, H. Wolfe,K. Wrona, A. G. Yagües-Molina, S. Yamada,Y. Yamazaki,R. Yoshida,C. Youngman,A. F. Żarnecki,L. Zawiejski, O. Zenaiev, W. Zeuner,B. O. Zhautykov,N. Zhmak,C. Zhou, A. Zichichi, M. Zolko, D. S. Zotkin,Z. Zulkapli

European Physical Journal C（2011）

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摘要

Photoproduction of beauty and charm quarks in events with at least two jets has been measured with the ZEUS detector at HERA using an integrated luminosity of 133 pb −1 . The fractions of jets containing b and c quarks were extracted using the invariant mass of charged tracks associated with secondary vertices and the decay-length significance of these vertices. Differential cross sections as a function of jet transverse momentum, p_T^jet , and pseudorapidity, η jet , were measured. The data are compared with previous measurements and are well described by next-to-leading-order QCD predictions.

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关键词

Transverse Momentum,Monte Carlo,Systematic Uncertainty,Differential Cross Section,Secondary Vertex

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