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Adams, T; Alton, A; Baldin, B; Baringer, P; Bazterra, V; Bean, A; Begalli, M; Bellantoni, L; Bernardi, G; Bertram, I; Beuselinck, R; Bhatia, S; Blessing, S; Bloom, K; Boline, D; Borissov, G; Brock, R; Camacho-Pérez, E; Casey, B C K; Cho, S W; Choi, S; Clutter, J; Corcoran, M; Cousinou, M-C; Déliot, F; Deterre, C; DeVaughan, K; Diehl, H T; Dominguez, A; Dudko, L V; Eads, M; Edmunds, D; Filthaut, F; Fisher, W; García-González, J A; Gershtein, Y; Greenlee, H; Haley, J; Han, L; Heintz, U; Hensel, C; Hoeneisen, B; Hogan, J; Hohlfeld, M; Howley, I; Iashvili, I; Illingworth, R; Jeong, M S; Jiang, P; Jung, A W; Juste, A; Kajfasz, E; Kiselevich, I; Kurča, T; Kuzmin, V A; Li, H; Lipton, R; Lyon, A L; Melnitchouk, A; Merkin, M; Meyer, A; Meyer, J; Mulhearn, M; Nagy, E; Narain, M; Neustroev, P; Osta, J; Pal, A; Parihar, V; Park, S K; Peters, Y; Petrillo, G; Price, D; Razumov, I; Ripp-Baudot, I; Ross, A; Sanders, M P; Scanlon, T; Shary, V; Shaw, S; Simak, V; Snow, G R; Snow, J; Sonnenschein, L; Stoyanova, D A; Svoisky, P; Tokmenin, V V; van Leeuwen, W M; Varelas, N; Vokac, P; Watts, G; Weichert, J; Williams, M R J; Yatsunenko, Y A; Ye, W; Youn, S W; Zhou, B; Zielinski, M; Zieminska, D; Zivkovic, L
Physical review letters, 2014-Jan-31, 20140131, Letnik: 112, Številka: 4Journal Article
We present the first measurements of the ratios of cross sections σ(pp → Z+c jet)/σ(pp → Z+jet) and σ(pp → Z+c jet)/σ(pp → Z+b jet) for the associated production of a Z boson with at least one charm or bottom quark jet. Jets have transverse momentum pT(jet)>20 GeV and pseudorapidity |η(jet)|<2.5. These cross section ratios are measured differentially as a function of jet and Z boson transverse momenta, based on 9.7 fb(-1) of pp collisions collected with the D0 detector at the Fermilab Tevatron Collider at √s=1.96 TeV. The measurements show significant deviations from perturbative QCD calculations and predictions from various event generators.
