Inclusive and multiplicity dependent production of electrons from heavy-flavour hadron decays in pp and p$-$Pb collisions

Abstract

Measurements of the production of electrons from heavy-flavour hadron decays in pp collisions at $\sqrt{s}=13$ TeV at midrapidity with the ALICE detector are presented down to a transverse momentum ($p_{\mathrm{T}}$) of 0.2 GeV$/c$ and up to $p_{\mathrm{T}}=35$ GeV$/c$, which is the largest momentum range probed for inclusive electron measurements in ALICE. In p$-$Pb collisions, the production cross section and the nuclear modification factor of electrons from heavy-flavour hadron decays are measured in the $p_{\mathrm{T}}$ range $0.5<p_{\mathrm{T}}<26$ GeV$/c$ at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV. The nuclear modification factor is found to be consistent with unity within the statistical and systematic uncertainties. In both collision systems, first measurements of the yields of electrons from heavy-flavour hadron decays in different multiplicity intervals normalised to the multiplicity-integrated yield (self-normalised yield) at midrapidity are reported as a function of the self-normalised charged-particle multiplicity estimated at midrapidity. The self-normalised yields in pp and p$-$Pb collisions grow faster than linear with the self-normalised multiplicity. A strong $p_{\mathrm{T}}$ dependence is observed in pp collisions, where the yield of high-$p_{\mathrm{T}}$ electrons increases faster as a function of multiplicity than the one of low-$p_{\mathrm{T}}$ electrons. The measurement in p$-$Pb collisions shows no $p_{\mathrm{T}}$ dependence within uncertainties. The self-normalised yields in pp and p$-$Pb collisions are compared with measurements of other heavy-flavour, light-flavour, and strange particles, and with Monte Carlo simulations.

46 pages, 17 captioned figures, 8 tables, authors from page 41, published version, figures at http://alice-publications.web.cern.ch/node/9209

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