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 pTintervals 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 0.5 <10 GeV/cand it lies close to the upper band of perturbative QCD calculation uncertainties up to pT=5 GeV/cand close to the mean value for largerpT. 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 factorRAA. The measurement of the RAAin different centrality classes allows in-medium energy loss of charm and beauty quarks to be investigated. The RAAshows a suppression with respect to unity at intermediate pT, which increases while moving towards more central collisions. Moreover, the measured RAAis 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 pTin heavy-ion collisions at LHC.

Acharya S., Adamova D., Adhya S.P., Adler A., Adolfsson J., Aggarwal M.M., et al. (2020). Measurement of electrons from semileptonic heavy-flavour hadron decays at midrapidity in pp and Pb–Pb collisions at √sNN=5.02 TeV. PHYSICS LETTERS. SECTION B, 804, 1-15 [10.1016/j.physletb.2020.135377].

Measurement of electrons from semileptonic heavy-flavour hadron decays at midrapidity in pp and Pb–Pb collisions at √sNN=5.02 TeV

Alici A.;Arcelli S.;Bellini F.;Carnesecchi F.;Cifarelli L.;Colocci M.;Scioli G.;
2020

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 pTintervals 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 0.5 <10 GeV/cand it lies close to the upper band of perturbative QCD calculation uncertainties up to pT=5 GeV/cand close to the mean value for largerpT. 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 factorRAA. The measurement of the RAAin different centrality classes allows in-medium energy loss of charm and beauty quarks to be investigated. The RAAshows a suppression with respect to unity at intermediate pT, which increases while moving towards more central collisions. Moreover, the measured RAAis 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 pTin heavy-ion collisions at LHC.
2020
Acharya S., Adamova D., Adhya S.P., Adler A., Adolfsson J., Aggarwal M.M., et al. (2020). Measurement of electrons from semileptonic heavy-flavour hadron decays at midrapidity in pp and Pb–Pb collisions at √sNN=5.02 TeV. PHYSICS LETTERS. SECTION B, 804, 1-15 [10.1016/j.physletb.2020.135377].
Acharya S.; Adamova D.; Adhya S.P.; Adler A.; Adolfsson J.; Aggarwal M.M.; Aglieri Rinella G.; Agnello M.; Agrawal N.; Ahammed Z.; Ahmad S.; Ahn S.U.;...espandi
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