Measurement of electrons from semileptonic heavy-flavour hadron decays at midrapidity in pp and Pb-Pb collisions at root s(NN)=5.02 TeV

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The ALICE Collaboration , Acharya , S , Brucken , E J , Chang , B , Hilden , T E , Kim , D J , Krizek , F , Litichevskyi , V , Mieskolainen , M M , Orava , R , Parkkila , J E , Rak , J , Rasanen , S S , Rytkonen , H , Slupecki , M , Snellman , T W , Trzaska , W H , Vargyas , M , Viinikainen , J & Zhou , Z 2020 , ' Measurement of electrons from semileptonic heavy-flavour hadron decays at midrapidity in pp and Pb-Pb collisions at root s(NN)=5.02 TeV ' , Physics Letters B , vol. 804 , 135377 . https://doi.org/10.1016/j.physletb.2020.135377

Titel: Measurement of electrons from semileptonic heavy-flavour hadron decays at midrapidity in pp and Pb-Pb collisions at root s(NN)=5.02 TeV
Författare: The ALICE collaboration; Acharya, S.; Brucken, E. J.; Chang, B.; Hilden, T. E.; Kim, D. J.; Krizek, F.; Litichevskyi, V.; Mieskolainen, M. M.; Orava, R.; Parkkila, J. E.; Rak, J.; Rasanen, S. S.; Rytkonen, H.; Slupecki, M.; Snellman, T. W.; Trzaska, W. H.; Vargyas, M.; Viinikainen, J.; Zhou, Z.
Upphovmannens organisation: Helsinki Institute of Physics
Datum: 2020-05-10
Språk: eng
Sidantal: 15
Tillhör serie: Physics Letters B
ISSN: 0370-2693
DOI: https://doi.org/10.1016/j.physletb.2020.135377
Permanenta länken (URI): http://hdl.handle.net/10138/321049
Abstrakt: The differential invariant yield as a function of transverse momentum (p(T)) 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 root s(NN) = 5.02 TeV in the p(T) intervals 0.5-26GeV/c( 0-10% and 30-50%) and 0.5-10 GeV/c (60-80%). The production cross section in proton-proton (pp) collisions at root s = 5.02 TeV was measured as well in 0.5 <pT<10GeV/c and it lies close to the upper band of perturbative QCD calculation uncertainties up to p(T) = 5 GeV/c and close to the mean value for larger p(T). 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 R-AA. The measurement of the R-AA in different centrality classes allows in-medium energy loss of charm and beauty quarks to be investigated. The R-AA shows a suppression with respect to unity at intermediate p(T), which increases while moving towards more central collisions. Moreover, the measured R-AA 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 p(T) in heavy-ion collisions at LHC. (c) 2020 Conseil Europeen pour la Recherche Nucleaire. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Subject: 114 Physical sciences
Referentgranskad: Ja
Licens: cc_by
Användningsbegränsning: openAccess
Parallelpublicerad version: publishedVersion


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