Measurement of electrons from beauty-hadron decays in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV

Abstract

The production of beauty hadrons was measured via semi-leptonic decays at mid-rapidity with the ALICE detector at the LHC in the transverse momentum interval $1<p_{\mathrm{T}}<8$ GeV/$c$ in minimum-bias p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and in $1.3<p_{\mathrm{T}}<8$ GeV/$c$ in the 20% most central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV. The pp reference spectra at $\sqrt{s}=5.02$ TeV and $\sqrt{s}=2.76$ TeV, needed for the calculation of the nuclear modification factors $R_{\mathrm{pPb}}$ and $R_{\mathrm{PbPb}}$, were obtained by a pQCD-driven scaling of the cross section of electrons from beauty-hadron decays measured at $\sqrt{s}=7$ TeV. In the $p_{\mathrm{T}}$ interval $3<p_{\mathrm{T}}<8$ GeV/$c$ a suppression of the yield of electrons from beauty-hadron decays is observed in Pb-Pb compared to pp collisions. Towards lower $p_{\mathrm{T}}$, the $R_{\mathrm{PbPb}}$ values increase with large systematic uncertainties. The $R_{\mathrm{pPb}}$ is consistent with unity within systematic uncertainties and is well described by theoretical calculations that include cold nuclear matter effects in p-Pb collisions. The measured $R_{\mathrm{pPb}}$ and these calculations indicate that cold nuclear matter effects are small at high transverse momentum also in Pb-Pb collisions. Therefore, the observed reduction of $R_{\mathrm{PbPb}}$ below unity at high $p_{\mathrm{T}}$ may be ascribed to an effect of the hot and dense medium formed in Pb-Pb collisions.

35 pages, 7 captioned figures, 3 tables, authors from page 29, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3055

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