Beauty production in pp collisions at √s = 2.76 TeV measured via semi-electronic decays
Özet
The ALICE Collaboration at the LHC reports measurement of the inclusive production cross section of electrons from semi-leptonic decays of beauty hadrons with rapidity |y| < 0.8 and transverse momentum
1 < pT < 10 GeV/c, in pp collisions at
√
s = 2.76 TeV. Electrons not originating from semi-electronic
decay of beauty hadrons are suppressed using 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 distribution of the azimuthal angle between heavy-flavour decay
electrons and charged hadrons. Perturbative QCD predictions agree with the measured cross section
within the experimental and theoretical uncertainties. The integrated visible cross section, σb→e =
3.47 ± 0.40(stat)+1.12(sys) ± 0.07(norm) μb, was extrapolated to full phase space using Fixed Order
−1.33 plusNext-to-LeadingLog(FONLL)calculationstoobtainthetotalbb ̄productioncrosssection,σbb ̄=
130 ± 15.1(stat)+42.1 (sys)+3.4 (extr) ± 2.5(norm) ± 4.4(BR) μb.
Koleksiyonlar
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