Measurements of low-$$p_T$$ electrons from semileptonic heavy-flavour hadron decays at mid-rapidity in pp and Pb-Pb collisions at $$\sqrt{s_{\mathrm{NN}}}=2.76$$ TeV
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 $$\sqrt{s_{\mathrm{NN}}}=2.76$$ 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 incoherent superposition of nucleon-nucleon collisions is quantified at mid-rapidity (|$$y$$| < 0.8) in the $$p_T$$ interval 0.50-3 GeV/$$c$$ via the nuclear modi cation 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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- The ALICE collaboration
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1550822
- Journal Information:
- Journal of High Energy Physics (Online), Vol. 2018, Issue 10; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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