Measurement of the $B^\pm$ production cross-section in pp collisions at $\sqrts =$ 7 and 13 TeVстатья
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Дата последнего поиска статьи во внешних источниках: 23 января 2018 г.
Аннотация:The production of B± mesons is studied in pp collisions at centre-of-mass energies of 7 and 13 TeV, using B±→J/ψK± decays and data samples corresponding to 1.0 fb−1 and 0.3 fb−1, respectively. The production cross-sections summed over both charges and integrated over the transverse momentum range 0<pT<40 GeV/c and the rapidity range 2.0<y<4.5 are measured to be σ(pp→B±X,s√=7 TeV)=43.0±0.2±2.5±1.7μb, σ(pp→B±X,s√=13 TeV)=86.6±0.5±5.4±3.4μb, where the first uncertainties are statistical, the second are systematic, and the third are due to the limited knowledge of the B±→J/ψK± branching fraction. The ratio of the cross-section at 13 TeV to that at 7 TeV is determined to be 2.02±0.02(stat)±0.12(syst). Differential cross-sections are also reported as functions of pT and y. All results are in agreement with theoretical calculations based on the state-of-art fixed next-to-leading order quantum chromodynamics.