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Title: Coherent J / ψ photoproduction in hadronic heavy-ion collisions

Abstract

Significant excesses of J/ yield at very low transverse momentum (p T < 0:3 GeV/c) were observed by the ALICE and STAR collaborations in peripheral hadronic A+A collisions. This is a Sign of coherent photoproduction of J/ψ in violent hadronic interactions. Theoretically, the photoproduction of J= in hadronic collisions raises questions about how spectator and non-spectator nucleons participate in the coherent reaction. We argue that the strong interactions in the overlapping region of incoming nuclei may disturb the coherent production, leaving room for different coupling assumptions. The destructive interference between photoproduction on ions moving in opposite directions also needs to be included. This letter presents calculations of J/ψ production from coherent photon-nucleus (γ+A → J/ψ +A) interactions in hadronic A+A collisions at RHIC and LHC energies with both nucleus and spectator coupling hypotheses. The integrated yield of coherent J/ψ as a function of centrality is found to be significantly different, especially towards central collisions, for different coupling scenarios. Differential distributions as a function of transverse momentum, azimuthal angle and rapidity in different centrality bins are also shown, and found to be more sensitive to the Pomeron coupling than to the photon coupling. Lastly, these predictions call for future experimental measurementsmore » to help better understand the coherent interaction in hadronic heavy-ion collisions.« less

Authors:
 [1];  [2];  [3];  [3];  [3];  [1];  [4];  [5];  [1];  [3]
  1. Univ. of Science and Technology of China, Hefei (China). Dept. of Modern Physics
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States); Shandong Univ., Jinan (China). Key Lab. of Particle Physics and Particle Irradiation (MOE)
  5. Shandong Univ., Jinan (China). Key Lab. of Particle Physics and Particle Irradiation (MOE)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1434001
Alternate Identifier(s):
OSTI ID: 1433753
Report Number(s):
BNL-203544-2018-JAAM
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:
SC0012704; AC-76SF00098
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Zha, W., Klein, S. R., Ma, R., Ruan, L., Todoroki, T., Tang, Z., Xu, Z., Yang, C., Yang, Q., and Yang, S. Coherent J/ψ photoproduction in hadronic heavy-ion collisions. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.97.044910.
Zha, W., Klein, S. R., Ma, R., Ruan, L., Todoroki, T., Tang, Z., Xu, Z., Yang, C., Yang, Q., & Yang, S. Coherent J/ψ photoproduction in hadronic heavy-ion collisions. United States. doi:10.1103/PhysRevC.97.044910.
Zha, W., Klein, S. R., Ma, R., Ruan, L., Todoroki, T., Tang, Z., Xu, Z., Yang, C., Yang, Q., and Yang, S. Thu . "Coherent J/ψ photoproduction in hadronic heavy-ion collisions". United States. doi:10.1103/PhysRevC.97.044910.
@article{osti_1434001,
title = {Coherent J/ψ photoproduction in hadronic heavy-ion collisions},
author = {Zha, W. and Klein, S. R. and Ma, R. and Ruan, L. and Todoroki, T. and Tang, Z. and Xu, Z. and Yang, C. and Yang, Q. and Yang, S.},
abstractNote = {Significant excesses of J/ yield at very low transverse momentum (pT < 0:3 GeV/c) were observed by the ALICE and STAR collaborations in peripheral hadronic A+A collisions. This is a Sign of coherent photoproduction of J/ψ in violent hadronic interactions. Theoretically, the photoproduction of J= in hadronic collisions raises questions about how spectator and non-spectator nucleons participate in the coherent reaction. We argue that the strong interactions in the overlapping region of incoming nuclei may disturb the coherent production, leaving room for different coupling assumptions. The destructive interference between photoproduction on ions moving in opposite directions also needs to be included. This letter presents calculations of J/ψ production from coherent photon-nucleus (γ+A → J/ψ +A) interactions in hadronic A+A collisions at RHIC and LHC energies with both nucleus and spectator coupling hypotheses. The integrated yield of coherent J/ψ as a function of centrality is found to be significantly different, especially towards central collisions, for different coupling scenarios. Differential distributions as a function of transverse momentum, azimuthal angle and rapidity in different centrality bins are also shown, and found to be more sensitive to the Pomeron coupling than to the photon coupling. Lastly, these predictions call for future experimental measurements to help better understand the coherent interaction in hadronic heavy-ion collisions.},
doi = {10.1103/PhysRevC.97.044910},
journal = {Physical Review C},
number = 4,
volume = 97,
place = {United States},
year = {Thu Apr 19 00:00:00 EDT 2018},
month = {Thu Apr 19 00:00:00 EDT 2018}
}

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