Measurement of electrons from beauty-hadron decays in pp and Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV

The ALICE collaboration
Phys.Rev.C 108 (2023) 034906, 2023.

Abstract (data abstract)
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 $\sqrt{s_{\rm{NN}}} = 5.02~{\rm TeV}$, using the ALICE detector at the LHC. The cross section measured in pp collisions in the transverse momentum interval $2< p_{T} < 8$ 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 $2< p_{T} < 26$ GeV/c, was used to compute the nuclear modification factor $R_{AA}$, extrapolating the pp reference cross section to $p_{T}$ larger than 8 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 on $p_{T}$ above 8 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.

  • Table 1

    Data from Figure 3

    10.17182/hepdata.144336.v1/t1

    $p_{T}$-differential cross section of electrons from beauty-hadron decays in pp collisions at $\sqrt{s}=5.02$ TeV. The rapidity of electrons is |y|...

  • Table 2

    Data from Figure 4, Pb-Pb

    10.17182/hepdata.144336.v1/t2

    Yield of beauty-hadron decay electrons in 0--10% central Pb--Pb collisions at $\sqrt{s_{\rm{NN}}} = 5.02$ TeV. The rapidity of electrons for...

  • Table 3

    Data from Figure 5, b(->c)->e

    10.17182/hepdata.144336.v1/t3

    The nuclear modification factor for beauty-hadron decay electrons in 0--10% central Pb--Pb collisions at $\sqrt{s_{\rm{NN}}} = 5.02$ TeV. The rapidity...

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