Nuclear modification factor of D0 mesons in PbPb collisions at sNN=5.02TeV

By A. Sirunyan, A. Tumasyan, W. Adam, Federico Ambrogi, E. Asilar, T. Bergauer, J. Brandstetter, E. Brondolin, M. Dragicevic, J. Eroe and 2,201 more. Physics Letters B, 2017

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The transverse momentum (p_T) spectrum of prompt D^0 mesons and their antiparticles has been measured via the hadronic decay channels D^0 → K^−π^+ and D^‾0 → K^+π^− in pp and PbPb collisions at a centre-of-mass energy of 5.02 TeV per nucleon pair with the CMS detector at the LHC. The measurement is performed in the D^0 meson p_T range of 2–100GeV/c and in the rapidity range of |y| < 1. The pp (PbPb) dataset used for this analysis corresponds to an integrated luminosity of 27.4 pb^(−1) (530 μb^(−1)). The measured D^0 meson p_T spectrum in pp collisions is well described by perturbative QCD calculations. The nuclear modification factor, comparing D0 meson yields in PbPb and pp collisions, was extracted for both minimum-bias and the 10% most central PbPb interactions. For central events, the D^0 meson yield in the PbPb collisions is suppressed by a factor of 5–6 compared to the ppreference in the p_T range of 6–10GeV/c. For D^0 mesons in the high-p_T range of 60–100GeV/c, a significantly smaller suppression is observed. The results are also compared to theoretical calculations.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/53f65cb0aeefcf9db589581c4b62ed87d8c3b64b

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