Measurement of B meson production cross-sections in proton-proton collisions at s√=7 TeV

Abstract

The production cross-sections of B mesons are measured in pp collisions at a centre-of-mass energy of 7 TeV, using data collected with the LHCb detector corresponding to a integrated luminosity of 0.36 fb−1. The B +, B 0 and B0s mesons are reconstructed in the exclusive decays B + → J/ψK +, B 0 → J/ψK *0 and B0s→J/ψϕ , with J/ψ → μ + μ −, K *0 → K +π− and ϕ → K + K − . The differential cross-sections are measured as functions of B meson transverse momentum p T and rapidity y, in the range 0 < p T < 40 GeV/c and 2.0 < y < 4.5. The integrated cross-sections in the same p T and y ranges, including charge-conjugate states, are measured to be σ(pp→B++X) =38.9±0.3(stat.)±2.5(syst.)±1.3(norm.)μb,σ(pp→B0+X) =38.1±0.6(stat.)±3.7(syst.)±4.7(norm.)μb,σ(pp→B0s+X) =10.5±0.2(stat.)±0.8(syst.)±1.0(norm.)μb, where the third uncertainty arises from the pre-existing branching fraction measurements.