Abstract

Open and hidden heavy-flavor measurements with the ALICE experiment at the LHC are reported. Emphasis goes to the recent results in p–Pb and Pb–Pb collisions at sNN=5.02 and 2.76 TeV respectively. Heavy-flavor measurements are presented in the form of either the ratio of the production cross sections in heavy-ion and pp collisions normalized by the average number of nucleon-nucleon collisions, or the per-event yields as a function of charged-particle multiplicity. Possible interpretations of these results in pp, p–Pb or Pb–Pb collisions in terms of multi-parton interactions, gluon saturation, initial or final state energy loss, system collective motion, color-charge screening or recombination of uncorrelated quarks are discussed.

Highlights

  • Open goes to and hidden heavy-flavor measurements with the A√LICE the recent results in p–Pb and Pb–Pb collisions at sNN experiment = 5.02 and at the LHC are reported

  • It has been hypothesized that if heavy quarks are abundant in the medium, uncorrelated pairs could recombine into quarkonia bound states in the QGP or at the hadronization phase [20, 21]

  • The ALICE experimental setup is completed with a set of detectors that are not used in the analyses reported here

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Summary

Introduction

The formation of hot and dense QCD matter might alter parton momentum distributions. Heavy quarks traversing extremely dense QCD matter lose energy via elastic or inelastic interactions with the medium constituents. If heavy quarks interact strongly with the medium or hadronize in it, they should inherit its azimuthal anisotropy [22] This would result in an azimuthal anisotropy of both open and hidden heavy-flavor production. J/ψ’s are reconstructed both via their dielectron and dimuon decays, while ψ(2S ) and Υ are measured from their dimuon decay These analyses exploit different detectors of the ALICE apparatus. Inner Tracking System and a Time Projection Chamber that allow vertex finding, and particle tracking and identification. Most of the results are presented here in the form of the nuclear modification factor, RAB, i.e. the relative particle production rates in heavy-ion, or proton-ion, and pp data per nucleon-nucleon collision: RAB(pT) =. Where dNAB/dpT represents the particle yield in AB collisions, dσpp/dpT is the production cross section in pp collisions, and TAB is the nuclear overlap function of nucleus A, or proton, and nucleus B

Open heavy-flavor production
14 ALICE Preliminary
Hidden heavy-flavor production
Summary
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