Transverse momentum dependence of D-meson production in Pb-Pb collisions at $$ \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=2.76 $$ TeV
Journal of High Energy Physics(2016)
Abstract
The production of prompt charmed mesons D0, D+ and D∗+, and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at the centre-of-mass energy per nucleon pair, $$ \sqrt{s_{\mathrm{NN}}} $$
, of 2.76 TeV. The production yields for rapidity |y| u003c 0.5 are presented as a function of transverse momentum, p
T, in the interval 1–36 GeV/c for the centrality class 0–10% and in the interval 1–16 GeV/c for the centrality class 30–50%. The nuclear modification factor R
AA was computed using a proton-proton reference at $$ \sqrt{s}=2.76 $$
TeV, based on measurements at $$ \sqrt{s}=7 $$
TeV and on theoretical calculations. A maximum suppression by a factor of 5-6 with respect to binary-scaled pp yields is observed for the most central collisions at p
T of about 10 GeV/c. A suppression by a factor of about 2-3 persists at the highest p
T covered by the measurements. At low p
T (1-3 GeV/c), the R
AA has large uncertainties that span the range 0.35 (factor of about 3 suppression) to 1 (no suppression). In all p
T intervals, the R
AA is larger in the 30-50% centrality class compared to central collisions. The D-meson R
AA is also compared with that of charged pions and, at large p
T, charged hadrons, and with model calculations.
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Key words
Heavy ion Experiments, Quark gluon plasma, Charm physics
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