Measurement of electrons from beauty-hadron decays in p-Pb collisions at √SNN=5.02 TeV and Pb-Pb collisions at. √SNN=2.76 TeV



Adam, J, Adamova, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Aiola, S
et al (show 999 more authors) (2017) Measurement of electrons from beauty-hadron decays in p-Pb collisions at √SNN=5.02 TeV and Pb-Pb collisions at. √SNN=2.76 TeV JOURNAL OF HIGH ENERGY PHYSICS, 2017 (7). 52-. ISSN 1126-6708, 1029-8479

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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<inf>T</inf>< 8 GeV/c in minimum-bias p-Pb collisions at sNN=5.02 TeV and in 1.3 < p<inf>T</inf>< 8 GeV/c in the 20% most central Pb-Pb collisions at sNN=2.76 TeV. The pp reference spectra at sNN=5.02 TeV and s=2.76 TeV, needed for the calculation of the nuclear modification factors R<inf>pPb</inf> and R<inf>PbPb</inf>, were obtained by a pQCD-driven scaling of the cross section of electrons from beauty-hadron decays measured at s=7 TeV. In the p<inf>T</inf> interval 3 < p<inf>T</inf>< 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<inf>T</inf>, the R<inf>PbPb</inf> values increase with large systematic uncertainties. The R<inf>pPb</inf> 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<inf>pPb</inf> 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<inf>PbPb</inf> below unity at high p<inf>T</inf> may be ascribed to an effect of the hot and dense medium formed in Pb-Pb collisions.[Figure not available: see fulltext.]

Item Type: Article
Uncontrolled Keywords: Heavy Ion Experiments
Depositing User: Symplectic Admin
Date Deposited: 22 Aug 2017 07:59
Last Modified: 16 Jun 2026 07:57
DOI: 10.1007/JHEP07(2017)052
Open Access URL: http://doi.org/10.1007/JHEP07(2017)052
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3009079
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