Measurement of electrons from beauty-hadron decays in pp and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The production of electrons from beauty-hadron decays was measured at midrapidity in proton-proton (pp) and central Pb-Pb collisions at center-of-mass energy per nucleon-nucleon pair $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV, using the ALICE detector at the LHC. The cross section measured in pp collisions in the transverse momentum interval $2<p_{\mathrm{T}}<8$ GeV/$c$ was compared with models based on perturbative quantum chromodynamics calculations. The yield in the 10% most central Pb-Pb collisions, measured in the interval $2<p_{\mathrm{T}}<26$ GeV/$c$, was used to compute the nuclear modification factor $R_{\mathrm{AA}}$, extrapolating the pp reference cross section to $p_{\mathrm{T}}$ larger than 8 GeV/$c$. The measured $R_{\mathrm{AA}}$ shows significant suppression of the yield of electrons from beauty-hadron decays at high $p_{\mathrm{T}}$ and does not show a significant dependence on $p_{\mathrm{T}}$ above 8 GeV/$c$ within uncertainties. The results are described by several theoretical models based on different implementations of the interaction of heavy quarks with a quark-gluon plasma, which predict a smaller energy loss for beauty quarks compared to light and charm quarks.

36 pages, 6 captioned figures, 2 tables, authors from page 31, published version, figures at http://alice-publications.web.cern.ch/node/8655

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• Production of leptons from decay of heavy-flavor hadrons in high-energy nuclear collisions