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Article
Report number arXiv:1609.03898 ; CERN-EP-2016-222 ; CERN-EP-2016-222
Title 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
Author(s) ALICE Collaboration  Show all 1009 authors
Publication 2017-07-11
Imprint 13 Sep 2016
Number of pages 34
Note 35 pages, 7 captioned figures, 3 tables, authors from page 29, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3055
In: JHEP 07 (2017) 052
DOI 10.1007/JHEP07(2017)052
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Free keywords relativistic heavy ion physics ; quark gluon plasma ; heavy quark production ; experimental results
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<pT<8 GeV/c in minimum-bias p–Pb collisions at sNN=5.02 TeV and in 1.3<pT<8 GeV/c in the 20% most central Pb-Pb collisions at sNN=2.76 TeV. The pp reference spectra at s=5.02 TeV and s=2.76 TeV, needed for the calculation of the nuclear modification factors RpA and RAA, were obtained by a pQCD-driven scaling of the cross section of electrons from beauty-hadron decays measured at s=7 TeV. The RAA is about 0.7 with an uncertainty of about 30% in the interval 3<pT<6 GeV/c and 0.47 with an uncertainty of 25% in 6<pT<8 GeV/c. Below pT=3 GeV/c. the RAA values increase with decreasing transverse momentum with systematic uncertainties of 30-45%. The RpA is consistent with unity within systematic uncertainties of about 20% at high pT, increasing at low pT, and is well described by theoretical calculations that include cold nuclear matter effects in p-Pb collisions. The measured RpA 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 RAA below unity for high pT can be ascribed to an effect of the hot and dense medium formed in Pb–Pb collisions.
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Email contact: enrico.scomparin@cern.ch


 Záznam vytvorený 2016-09-06, zmenený 2024-11-27


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