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In-medium charmonium production in proton-nucleus collisions

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  • Published: 05 March 2019
  • Volume 2019, article number 15, (2019)
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Journal of High Energy Physics Aims and scope Submit manuscript
In-medium charmonium production in proton-nucleus collisions
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  • Xiaojian Du  ORCID: orcid.org/0000-0001-6430-35511 &
  • Ralf Rapp1 

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  • 44 Citations

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A preprint version of the article is available at arXiv.

Abstract

We study charmonium production in proton-nucleus (p-A) collisions focusing on final-state effects caused by the formation of an expanding medium. Toward this end we utilize a rate equation approach within a fireball model as previously employed for a wide range of heavy-ion collisions, adapted to the small systems in p-A collisions. The initial geometry of the fireball is taken from a Monte-Carlo event generator where initial anisotropies are caused by fluctuations. We calculate the centrality and transverse-momentum dependent nuclear modification factor (RpA) as well as elliptic flow (v2) for both J/ψ and ψ(2S) and compare them to experimental data from RHIC and the LHC. While the RpAs show an overall fair agreement with most of the data, the large v2 values observed in p-Pb collisions at the LHC cannot be accounted for in our approach. While the former finding generally supports the formation of a near thermalized QCD medium in small systems, the discrepancy in the v2 suggests that its large observed values are unlikely to be due to the final-state collectivity of the fireball alone.

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This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Authors and Affiliations

  1. Cyclotron Institute and Department of Physics and Astronomy, Texas A&M University, TAMU 3366, College Station, TX, 77843-3366, U.S.A.

    Xiaojian Du & Ralf Rapp

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  1. Xiaojian Du
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  2. Ralf Rapp
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Correspondence to Xiaojian Du.

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ArXiv ePrint: 1808.10014

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Du, X., Rapp, R. In-medium charmonium production in proton-nucleus collisions. J. High Energ. Phys. 2019, 15 (2019). https://doi.org/10.1007/JHEP03(2019)015

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  • Received: 02 September 2018

  • Revised: 19 February 2019

  • Accepted: 23 February 2019

  • Published: 05 March 2019

  • DOI: https://doi.org/10.1007/JHEP03(2019)015

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Keywords

  • Heavy Ion Phenomenology
  • Quark-Gluon Plasma
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