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Transverse momentum dependence of D-meson production in Pb-Pb collisions at √sNN = 2.76 TeV
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Transverse momentum dependence of D-meson production in Pb-Pb collisions at √sNN = 2.76 TeV

The ALICE collaboration,, J. Adam, D. Adamová, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, S. Aiola, …
Journal of High Energy Physics, 卷.2016(3), 81
03/2016

摘要

Charm physics Heavy ion Experiments Quark gluon plasma Nuclear and High Energy Physics
The production of prompt charmed mesons D <sup>0</sup> , D <sup>+</sup> and D <sup>∗+</sup> , and their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at the centre-of-mass energy per nucleon pair, (Formula presented.) , of 2.76 TeV. The production yields for rapidity |y| < 0.5 are presented as a function of transverse momentum, p <sub>T</sub> , 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 <sub>AA</sub> was computed using a proton-proton reference at (Formula presented.) TeV, based on measurements at (Formula presented.) 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 <sub>T</sub> of about 10 GeV/c. A suppression by a factor of about 2-3 persists at the highest p <sub>T</sub> covered by the measurements. At low p <sub>T</sub> (1-3 GeV/c), the R <sub>AA</sub> has large uncertainties that span the range 0.35 (factor of about 3 suppression) to 1 (no suppression). In all p <sub>T</sub> intervals, the R <sub>AA</sub> is larger in the 30-50% centrality class compared to central collisions. The D-meson R <sub>AA</sub> is also compared with that of charged pions and, at large p <sub>T</sub> , charged hadrons, and with model calculations.

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https://doi.org/10.1007/JHEP03(2016)081檢視
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