Measurements of low-p(T) electrons from semileptonic heavy-flavour hadron decays at mid-rapidity in pp and Pb-Pb collisions at root s(NN)=2.A76 TeV
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Zinovjev, G. and Zmeskal, J. and Zou, S. and ALICE Collaboration... Show more Show less
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Abstract
Transverse-momentum (p(T)) differential yields of electrons from
semileptonic heavy-flavour hadron decays have been measured in the most
central (0-10\%) and in semi-central (20-40\%) Pb-Pb collisions at TeV.
The corresponding production cross section in pp collisions has been
measured at the same energy with substantially reduced systematic
uncertainties with respect to previously published results. The
modification of the yield in Pb-Pb collisions with respect to the
expectation from an incoheerent superposition of nucleon-nucleon
collisions is quantified at mid-rapidity (|y| < 0.8) in the p(T)
interval 0.5-3 GeV/c via the nuclear modification factor, R-AA. This
paper extends the p(T) reach of the R-AA measurement towards
significantly lower values with respect to a previous publication. In
Pb-Pb collisions the p(T)-differential measurements of yields at low
p(T) are essential to investigate the scaling of heavy-flavour
production with the number of binary nucleon-nucleon collisions.
Heavy-quark hadronization, a collective expansion and even initial-state
effects, such as the nuclear modification of the Parton Distribution
Function, are also expected to have a significant effect on the measured
distribution.... Show more Show less