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Nuclear Modification Factor of D 0 Mesons in PbPb Collisions at √s[subscript NN] = 5.02 TeV

Author(s)
CMS Collaboration; Abercrombie, Daniel Robert; Allen, Brandon Leigh; Azzolini, Virginia; Barbieri, Richard Alexander; Baty, Austin Alan; Bi, Ran; Brandt, Stephanie Akemi; Busza, Wit; Cali, Ivan Amos; D'Alfonso, Mariarosaria; Demiragli, Zeynep; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hsu, Dylan George; Iiyama, Yutaro; Innocenti, Gian Michele; Klute, Markus; Kovalskyi, Dmytro; Lai, Yue Shi; Lee, Yen-Jie; Levin, Amy Elizabeth; Luckey Jr, P David; Maier, Benedikt; Marini, Andrea Carlo; McGinn, Christopher Francis; Mironov, Camelia Maria; Narayanan, Siddharth Madhavan; Niu, Xinmei; Paus, Christoph M. E.; Roland, Christof E; Roland, Gunther M; Salfeld-Nebgen, Jakob Maxillian Henry; Stephans, George S. F.; Tatar, Kaya; Velicanu, Dragos Alexandru; Wang, Jing; Wang, Ta-Wei; Wyslouch, Boleslaw; ... Show more Show less
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Abstract
The transverse momentum (pT) spectrum of prompt D0mesons and their antiparticles has been measured via the hadronic decay channels D⁰→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 D⁰ meson pTrange 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 D⁰ meson pTspectrum in pp collisions is well described by perturbative QCD calculations. The nuclear modification factor, comparing D0meson yields in PbPb and pp collisions, was extracted for both minimum-bias and the 10% most central PbPb interactions. For central events, the D⁰ meson yield in the PbPb collisions is suppressed by a factor of 5–6 compared to the pp reference in the pTrange of 6–10GeV/c. For D0mesons in the high-pTrange of 60–100GeV/c, a significantly smaller suppression is observed. The results are also compared to theoretical calculations. Keywords: Physics; Suppression; Quark gluon plasma; Shadowing; D-meson; Open heavy-flavour
Date issued
2018-05
URI
http://hdl.handle.net/1721.1/120842
Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physics Letters B
Publisher
Elsevier BV
Citation
Sirunyan, A.M. et al. “Nuclear Modification Factor of D 0 Mesons in PbPb Collisions at √s[subscript NN] = 5.02 TeV.” Physics Letters B 782 (July 2018): 474–496 © 2018 The Author(s)
Version: Final published version
ISSN
0370-2693

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