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  • Measurement of beauty and c...
    Abramowicz, H.; Adamczyk, L.; Adamus, M.; Antonelli, S.; Arslan, O.; Aushev, V.; Aushev, Y.; Barakbaev, A. N.; Bartosik, N.; Bertolin, A.; Bloch, I.; Bokhonov, V.; Boos, E. G.; Brock, I.; Brzozowska, B.; Bussey, P. J.; Capua, M.; Catterall, C. D.; Chwastowski, J.; Ciesielski, R.; Corradi, M.; Corriveau, F.; D’Agostini, G.; Dementiev, R. K.; Devenish, R. C. E.; Dolinska, G.; Drugakov, V.; Dusini, S.; Ferrando, J.; Figiel, J.; Geiser, A.; Gladilin, L. K.; Gogota, O.; Golubkov, Yu. A.; Grebenyuk, J.; Hain, W.; Hochman, D.; Hori, R.; Iga, Y.; Januschek, F.; Kadenko, I.; Kananov, S.; Karshon, U.; Kaur, M.; Kaur, P.; Klein, U.; Kotanski, A.; Kötz, U.; Levchenko, B. B.; Libov, V.; Limentani, S.; Lisovyi, M.; Lohmann, W.; Löhr, B.; Longhin, A.; Maeda, J.; Malka, J.; Martin, J. F.; Nobe, T.; Notz, D.; Nowak, R. J.; Olkiewicz, K.; Paul, E.; Perlanski, W.; Przybycien, M.; Raval, A.; Rubinsky, I.; Samojlov, V.; Saxon, D. H.; Schioppa, M.; Schmidke, W. B.; Schwartz, J.; Shcheglova, L. M.; Shehzadi, R.; Shkola, O.; Singh, I.; Slominski, W.; Solano, A.; Spiridonov, A.; Stanco, L.; Stern, A.; Stewart, T. P.; Stopa, P.; Sztuk-Dambietz, J.; Szuba, D.; Szuba, J.; Tokushuku, K.; Tomaszewska, J.; Tsurugai, T.; Turcato, M.; Turkot, O.; Verbytskyi, A.; Walczak, R.; Wan Abdullah, W. A. T.; Wing, M.; Yamada, S.; Żarnecki, A. F.; Zawiejski, L.; Zhautykov, B. O.; Zotkin, D. S.

    The journal of high energy physics, 09/2014, Volume: 2014, Issue: 9
    Journal Article

    A bstract The production of beauty and charm quarks in ep interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared 5 < Q 2 < 1000 GeV 2 using an integrated luminosity of 354 pb −1 . The beauty and charm content in events with at least one jet have been 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 Q 2 , Bjorken x , jet trans- verse energy and pseudorapidity were measured and compared with next-to-leading-order QCD calculations. The beauty and charm contributions to the proton structure functions were extracted from the double-differential cross section as a function of x and Q 2 . The running beauty-quark mass, m b at the scale m b , was determined from a QCD fit at next-to-leading order to HERA data for the first time and found to be m b ( m b ) = 4.07 ± 0.14 (fit) − 0.07 + 0.01 (mod.) − 0.00 + 0.05 (param.) − 0.05 + 0.08 (theo.) GeV.