Suppression and azimuthal anisotropy of prompt and nonprompt J/ψ production in PbPb collisions at √s[subscript NN] =2.76 TeV
Author(s)Abercrombie, Daniel Robert; Allen, Brandon Leigh; Apyan, Aram; Barbieri, Richard Alexander; Baty, Austin Alan; Bi, Ran; Bierwagen, Katharina; Brandt, Stephanie Akemi; Cali, Ivan Amos; Demiragli, Zeynep; Di Matteo, Leonardo; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hsu, Dylan George; Iiyama, Yutaro; Innocenti, Gian Michele; Klute, Markus; Kovalskyi, Dmytro; Krajczar, Krisztian F.; Lai, Yue Shi; Lee, Yen-Jie; Levin, Andrew Michael; Luckey Jr, P David; Maier, Benedikt; Marini, Andrea Carlo; McGinn, Christopher Francis; Mironov, Camelia Maria; Narayanan, Siddharth Madhavan; Nahn, Steven; Roland, Christof E; Roland, Gunther M; Salfeld-Nebgen, Jakob Maxillian Henry; Stephans, George S. F.; Sumorok, Konstanty C; Tatar, Kaya; Varma, Mukund Madhav; Velicanu, Dragos Alexandru; Wang, J.; Wang, Ta-Wei; Wyslouch, Boleslaw; Yang, Mingming; Wyslouch, Victoria; ... Show more Show less
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The nuclear modification factor R[subscript AA] and the azimuthal anisotropy coefficient v[subscript 2] of prompt and nonprompt (i.e. those from decays of b hadrons) J/ψ mesons, measured from PbPb and pp collisions at √s[subscript NN] = 2.76TeV at the LHC, are reported. The results are presented in several event centrality intervals and several kinematic regions, for transverse momenta p[subscript T]> 6.5 GeV/c and rapidity | y| < 2.4 , extending down to p[subscript T] = 3 GeV/c in the 1.6 < | y| < 2.4 range. The v[subscript 2] of prompt J/ ψ is found to be nonzero, but with no strong dependence on centrality, rapidity, or pTover the full kinematic range studied. The measured v[subscript 2] of nonprompt J/ψ is consistent with zero. The R[subscript AA] of prompt J/ψ exhibits a suppression that increases from peripheral to central collisions but does not vary strongly as a function of either y or pTin the fiducial range. The nonprompt J/ψ R[subscript AA] shows a suppression which becomes stronger as rapidity or p[subscript T] increases. The v[subscript 2] and R[subscript AA] of open and hidden charm, and of open charm and beauty, are compared.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
The European Physical Journal C
CMS Collaboration, et al. “Suppression and Azimuthal Anisotropy of Prompt and Nonprompt J/ψ Production in PbPb Collisions at √s[subscript NN] = 2.76 TeV.” The European Physical Journal C, vol. 77, no. 4, Apr. 2017. © 2017 CERN for the benefit of the CMS collaboration.
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