Measurement of electrons from heavy-flavour hadron decays in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Abstract

The production of electrons from heavy-flavour hadron decays was measured as a function of transverse momentum ($p_{\mathrm{T}}$) in minimum-bias p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with ALICE at the LHC. The measurement covers the $p_{\mathrm{T}}$ interval $0.5<p_{\mathrm{T}}<12$ GeV/$c$ and the rapidity range $-1.06<y_{\mathrm{cms}}<0.14$ in the centre-of-mass reference frame. The contribution of electrons from background sources was subtracted using an invariant mass approach. The nuclear modification factor $R_{\mathrm{pPb}}$ was calculated by comparing the $p_{\mathrm{T}}$-differential invariant cross section in p-Pb collisions to a pp reference at the same centre-of-mass energy, which was obtained by interpolating measurements at $\sqrt{s}=2.76$ TeV and $\sqrt{s}=7$ TeV. The $R_{\mathrm{pPb}}$ is consistent with unity within uncertainties of about 25%, which become larger for $p_{\mathrm{T}}$ below 1 GeV/$c$. The measurement shows that heavy-flavour production is consistent with binary scaling, so that a suppression in the high-$p_{\mathrm{T}}$ yield in Pb-Pb collisions has to be attributed to effects induced by the hot medium produced in the final state. The data in p-Pb collisions are described by recent model calculations that include cold nuclear matter effects.

24 pages, 5 captioned figures, 1 table, authors from page 19, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1888

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