Measurement of the B_s⁰ production cross section with B_s⁰→J/ψφ decays in pp Collisions at √s = 7 TeV

Abstract

The B_s⁰ differential production cross section is measured as functions of the transverse momentum and rapidity in pp collisions at √s=7 TeV, using the B_s⁰→J/ψφ decay, and compared with predictions based on perturbative QCD calculations at next-to-leading order. The data sample, collected by the CMS experiment at the LHC, corresponds to an integrated luminosity of 40 pb^-1. The B_s⁰ is reconstructed from the decays J/ψ→μ⁺μ^- and φ→K⁺K^-. The integrated B_s⁰ cross section times B_s⁰→J/ψφ branching fraction in the range 8<pTB<50 GeV/c and |y^B|<2.4 is measured to be 6.9±0.6±0.6 nb, where the first uncertainty is statistical and the second is systematic.