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

S. Acharya , D. Dabrowski , S. De , Kamil Deja , R. A. Diaz , P. Ghosh , Łukasz Graczykowski , A. Gupta , A. Herghelegiu , C. Huang , Monika Jakubowska , Monika Janik , Przemysław Karczmarczyk , A. M. Khan , S. Khan , S. Khan , D. Kim , D.J Kim , H. Kim , J. Kim , J. Kim , S. Kim , Adam Kisiel , M. Kowalski , S. Lee , X. Li , X. Li , S. Liu , M.I. Martínez , H. Murakami , Julian Myrcha , P. Nowakowski , Janusz Oleniacz , J. Park , B. Paul , Jan Pluta , J. Rak , M. Richter , Przemysław Rokita , Krystian Rosłon , S. Saha , C. Schmidt , M.O. Schmidt , M. Schmidt , Tomasz Trzciński , Barbara Trzeciak , Y. Wu , S. Yang , Ammar Zaman , Hanna Zbroszczyk , X. Zhang

Abstract

The differential invariant yield as a function of transverse momentum (pT) of electrons from semileptonic heavy-flavour hadron decays was measured at midrapidity in central (0–10%), semi-central (30–50%) and peripheral (60–80%) lead–lead (Pb–Pb) collisions at sNN=5.02 TeV in the pT intervals 0.5–26 GeV/c (0–10% and 30–50%) and 0.5–10 GeV/c (60–80%). The production cross section in proton–proton (pp) collisions at s=5.02 TeV was measured as well in 0.5T<10 GeV/c and it lies close to the upper band of perturbative QCD calculation uncertainties up to pT=5 GeV/c and close to the mean value for larger pT. The modification of the electron yield with respect to what is expected for an incoherent superposition of nucleon–nucleon collisions is evaluated by measuring the nuclear modification factor RAA. The measurement of the RAA in different centrality classes allows in-medium energy loss of charm and beauty quarks to be investigated. The RAA shows a suppression with respect to unity at intermediate pT, which increases while moving towards more central collisions. Moreover, the measured RAA is sensitive to the modification of the parton distribution functions (PDF) in nuclei, like nuclear shadowing, which causes a suppression of the heavy-quark production at low pT in heavy-ion collisions at LHC.
Collective authorD Adamova, S.P. Adhya, A. Adler, J. Adolfsson, M.M. Aggarwal, G. Aglieri Rinella, M. Agnel.....
Author S. Acharya - [Variable Energy Cyclotron Centre India]
S. Acharya,,
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, D. Dabrowski (WUT)
D. Dabrowski,,
- Warsaw University of Technology
, S. De - [Indian Institute of Technology Indore]
S. De,,
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, Kamil Deja (FEIT / ICS)
Kamil Deja,,
- The Institute of Computer Science
, R. A. Diaz - [Centro de Aplicaciones Tecnologicas y Desarrollo Nuclear]
R. A. Diaz,,
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, P. Ghosh - [Variable Energy Cyclotron Centre India]
P. Ghosh,,
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, Łukasz Graczykowski (FP / NPD)
Łukasz Graczykowski,,
- Nuclear Physics Division
, A. Gupta - [University of Jammu]
A. Gupta,,
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, A. Herghelegiu - [Horia Hulubei National Institute of Physics and Nuclear Engineering]
A. Herghelegiu,,
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, C. Huang - [Institut de Physique Nucleaire Orsay]
C. Huang,,
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et al.`
Journal seriesPhysics Letters B, [Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics], ISSN 0370-2693, e-ISSN 1873-2445
Issue year2020
Vol804
Article number135377
ASJC Classification3106 Nuclear and High Energy Physics
Languageen angielski
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 22-09-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.548; WoS Impact Factor: 2018 = 4.162 (2) - 2018=3.627 (5)
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