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Title: Probing parton dynamics of QCD matter with Ω and Φ production

Journal Article · · Physical Review C
 [1]
  1. AGH University of Science and Technology, FPACS, Cracow (Poland). et al.

We present measurements of Ω and φ production at midrapidity from Au+Au collisions at nucleon-nucleon center-of-mass energies sNN=7.7, 11.5, 19.6, 27, and 39 GeV by the STAR experiment at the BNL Relativistic Heavy Ion Collider (RHIC). Motivated by the coalescence formation mechanism for these strange hadrons, we study the ratios of N(Ω-+Ω#x0002B;)/[2N(φ)]. These ratios as a function of transverse momentum pT fall on a consistent trend at high collision energies, but start to show deviations in peripheral collisions at sNN=19.6, 27, and 39 GeV, and in central collisions at 11.5 GeV in the intermediate pT region of 2.4-3.6 GeV/c. We further evaluate empirically the strange quark pT distributions at hadronization by studying the Ω/φ ratios scaled by the number of constituent quarks (NCQ). The NCQ-scaled Ω/φ ratios show a suppression of strange quark production in central collisions at 11.5 GeV compared to sNN≥19.6 GeV. The shapes of the presumably thermal strange quark distributions in 0-60% most central collisions at 7.7 GeV show significant deviations from those in 0-10% most central collisions at higher energies. These features suggest that there is likely a change of the underlying strange quark dynamics in the transition from quark matter to hadronic matter at collision energies below 19.6 GeV.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
STAR Collaboration
Grant/Contract Number:
SC00112704; AC02-05CH11231
OSTI ID:
1340354
Alternate ID(s):
OSTI ID: 1239435; OSTI ID: 1459366
Report Number(s):
BNL-112090-2016-JA; PRVCAN; R&D Project: PO 004; KB0202012
Journal Information:
Physical Review C, Vol. 93, Issue 2; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Ω and ϕ production in Au + Au collisions at $$\sqrt{s_{_\mathrm{NN}}} = 11.5$$ s NN = 11.5   and 7.7 GeV in a dynamical quark coalescence model journal March 2018
Squeezed back-to-back correlations of bosons with nonzero widths in relativistic heavy-ion collisions journal July 2019
Nucleon-number scalings of anisotropic flows and nuclear modification factor for light nuclei in the squeeze-out region journal June 2019
Hard-Core Radius of Nucleons within the Induced Surface Tension Approach journal February 2019
Hard-core Radius of Nucleons within the Induced Surface Tension Approach text January 2018
Squeezed back-to-back correlations of bosons with nonzero widths in relativistic heavy-ion collisions text January 2019
Nucleon-number scalings of anisotropic flows and nuclear modification factor for light nuclei in the squeeze-out region text January 2020


Figures / Tables (5)