Abstract
Heavy quarks are a powerful probe for investigating the properties of the Quark- Gluon Plasma created in heavy-ion collisions, since they are produced in initial hard scattering processes and experience all the stages of the medium evolution. ALICE has measured the production of D0 D+, D*+ and D+s mesons at central rapidity in their hadronic decay channels in various collision systems and energies. We present recent results for D-meson production measured by the ALICE Collaboration in pp collisions at = 7 and 2.76 TeV, Pb-Pb collisions at = 2.76 TeV and p-Pb collisions at = 5.02 TeV.
Highlights
The measurement of heavy-flavour production in various collision systems and energies offers the opportunity to investigate the properties of the hot and dense QCD matter, the QuarkGluon Plasma (QGP), created in high energy heavy-ion collisions
Figure 5. √Average RAA of D0, D+ and D∗+ mesons as a function of centrality in Pb–Pb collisions at sNN = 2.76 TeV, compared with RAA of non-prompt J/ψ mesons measured with CMS [33] and charged pions measured with ALICE were chosen such that the kinematics of D and B mesons were similar
Measurements of the production of D mesons at mid-rapidity in pp, Pb–Pb and p–Pb collisions performed with ALICE have been presented
Summary
The measurement of heavy-flavour production in various collision systems and energies offers the opportunity to investigate the properties of the hot and dense QCD matter, the QuarkGluon Plasma (QGP), created in high energy heavy-ion collisions Due to their large masses, charm and beauty quarks are produced predominantly in hard parton scattering processes in the early stage of the collision. The measurement of charm and beauty production cross sections in pp collisions at the LHC provides an important test of perturbative QCD (pQCD) calculations and serves as an essential reference for understanding the results from heavy-ion collisions [11]. A similar trend has been observed for inclusive J/ψ measured with ALICE [28] These results may suggest that either D-meson production in pp collisions is connected with a strong hadronic activity, or with multiple hard parton interactions. The nuclear modification factors of D0, D+ and D∗+ mesons measured in the range 2 < pT < 16 GeV/c using the 2010 data sample were reported in Ref. [11] and the v2 results from the 2011 data sample were reported in Ref. [29, 30]
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