Measurement of D+s production and nuclear modification factor in Pb-Pb collisions at √sNN = 2.76 TeV

Adam, J. and Antičić, Tome and Erhardt, Filip and Gotovac, Sven and Mudnić, Eugen and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Utrobičić, Antonija and Vicković, Linda and Zyzak, M. (ALICE Collaboration) (2016) Measurement of D+s production and nuclear modification factor in Pb-Pb collisions at √sNN = 2.76 TeV. Journal of High Energy Physics, 2016 (3). Art.No.82-33. ISSN 1029-8479

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The production of prompt D+ s mesons was measured for the first time in collisions of heavy nuclei with the ALICE detector at the LHC. The analysis was performed on a data sample of Pb-Pb collisions at a centre-of-mass energy per nucleon pair, √sNN, of 2.76 TeV in two different centrality classes, namely 0–10% and 20–50%. D+ s mesons and their antiparticles were reconstructed at mid-rapidity from their hadronic decay channel D+ s → φπ+, with φ → K−K+, in the transverse momentum intervals 4 < pT < 12 GeV/c and 6 < pT < 12 GeV/c for the 0–10% and 20–50% centrality classes, respectively. The nuclear modification factor RAA was computed by comparing the pT-differential production yields in Pb-Pb collisions to those in proton-proton (pp) collisions at the same energy. This pp reference was obtained using the cross section measured at √ s = 7 TeV and scaled to √ s = 2.76 TeV. The RAA of D+ s mesons was compared to that of non-strange D mesons in the 10% most central Pb-Pb collisions. At high pT (8 < pT < 12 GeV/c ) a suppression of the D+ s -meson yield by a factor of about three, compatible within uncertainties with that of non-strange D mesons, is observed. At lower pT (4 < pT < 8 GeV/c ) the values of the D+ s -meson RAA are larger than those of non-strange D mesons, although compatible within uncertainties. The production ratios D+ s /D0 and D+ s /D+ were also measured in Pb-Pb collisions and compared to their values in proton-proton collisions.

Item Type: Article
Keywords: hadron-hadron scattering, heavy ion experiments, quark gluon plasma
Date: March 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: Open Access. © Copyright CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP3. Received: October 5, 2015. Accepted: February 3, 2016. Published: March 14, 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: Springer
Depositing User: Nikola Poljak
Date Deposited: 27 May 2016 10:22
Last Modified: 01 May 2018 17:57

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