Measurement of electrons from beauty-hadron decays in $pp$ and Pb-Pb collisions at $$\sqrt{s_{NN}}$$ = $5.02$ TeV
Journal Article
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· Physical Review. C
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- Centre National de la Recherche Scientifique (CNRS) (France); Univ. Clermont Auvergne, Clermont-Ferrand (France); ALICE Collaboration. et al.
The production of electrons from beauty-hadron decays was measured at midrapidity in proton-proton ($pp$) and central Pb-Pb collisions at center-of-mass energy per nucleon-nucleon pair $$\sqrt{s_{NN}}$$ = 5.02 TeV, using the ALICE detector at the LHC. The cross section measured in p p collisions in the transverse momentum interval $$2$$ < $$p_T$$ < $26$ $$\mathrm{GeV}$$ / $$c$$ was compared with models based on perturbative quantum chromodynamics calculations. The yield in the 10% most central Pb-Pb collisions, measured in the interval $$2$$ < $$p_T$$ < $26$ $$\mathrm{GeV}$$ / $$c$$, was used to compute the nuclear modification factor $$R_{AA}$$, extrapolating the $pp$ reference cross section to $$p_T$$ larger than 8 $$\mathrm{GeV}$$ / $$c$$. The measured $$R_{AA}$$ shows significant suppression of the yield of electrons from beauty-hadron decays at high $$p_T$$ and does not show a significant dependence above 8 $$\mathrm{GeV}$$ / $$c$$ within uncertainties. The results are described by several theoretical models based on different implementations of the interaction of heavy quarks with a quark-gluon plasma, which predict a smaller energy loss for beauty quarks compared to light and charm quarks.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- ALICE Collaboration
- Grant/Contract Number:
- AC02-05CH11231; AC05-00OR22725
- OSTI ID:
- 2280931
- Alternate ID(s):
- OSTI ID: 2333770
- Journal Information:
- Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 108; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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