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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
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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

The ALICE collaboration,, J. Adam, D. Adamová, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S. Ahmad, S.U. Ahn, …
Journal of High Energy Physics, 卷.2017(7), 52
07/2017

摘要

Heavy Ion Experiments Nuclear and High Energy Physics
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 <sub>T</sub> < 8 GeV/c in minimum-bias p-Pb collisions at sNN=5.02 TeV and in 1.3 < p <sub>T</sub> < 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 <sub>pPb</sub> and R <sub>PbPb</sub> , 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 <sub>T</sub> interval 3 < p <sub>T</sub> < 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 <sub>T</sub> , the R <sub>PbPb</sub> values increase with large systematic uncertainties. The R <sub>pPb</sub> 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 <sub>pPb</sub> 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 <sub>PbPb</sub> below unity at high p <sub>T</sub> may be ascribed to an effect of the hot and dense medium formed in Pb-Pb collisions.[Figure not available: see fulltext.]

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https://doi.org/10.1007/JHEP07(2017)052檢視
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