Beauty production in pp collisions at sqrt(s) = 2.76 TeV, measured using semi-electronic decays

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2.76 TeV
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The production cross section of electrons from semi-leptonic decays of beauty hadrons in pp collisions at sqrt(s) = 2.76 TeV at mid-rapidity (|y|<0.8) in the transverse momentum range of 1-10 GeV/c with the ALICE experiment at the CERN LHC is reported. Electrons, other than those from the semi-electronic decays of beauty hadrons, were suppressed based on the impact parameter of the corresponding tracks. The production cross section of beauty decay electrons is compared to the result obtained with an alternative method which uses the difference in azimuth of heavy-flavour decay electrons and charged hadrons. Various perturbative QCD calculations are in agreement with the measured cross section within the experimental and theoretical uncertainties. The integrated visible cross section, sigma_(b->e)= 3.47+-0.40(stat)^{+1.12}_{-1.33}(sys)+-0.07(norm) mub, was extrapolated to full phase space using FONLL and the total bbbar production cross section, sigma_(bbbar) = 130+-15.1(stat)^{+42.1}_{-49.8}(sys)^{+3.4}_{-3.1}(exta)+-2.5(norm)+-4.4(BR) mub, was obtained.