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Title: Centrality and transverse momentum dependence of D 0-meson production at mid-rapidity in Au+Au collisions at √sNN = 200 GeV

Abstract

Here, we report a new measurement of D 0-meson production at mid-rapidity (|y|\,<\,1) in Au+Au collisions at √ sNN = 200GeV utilizing the Heavy Flavor Tracker, a high resolution silicon detector at the STAR experiment. Invariant yields of D0-mesons with transverse momentum p T ≲9\,GeV/c are reported in various centrality bins (0-10%, 10-20%, 20-40%, 40-60% and 60-80%). Blast-Wave thermal models are used to fit the D 0-meson p T spectra to study D 0 hadron kinetic freeze-out properties. The average radial flow velocity extracted from the fit is considerably smaller than that of light hadrons (π,K and p), but comparable to that of hadrons containing multiple strange quarks (φ,Ξ¯), indicating that D 0 mesons kinetically decouple from the system earlier than light hadrons. The calculated D 0 nuclear modification factors re-affirm that charm quarks suffer large amount of energy loss in the medium, similar to those of light quarks for pT > 4 GeV/c in central 0-10% Au+Au collisions. At low p T, the nuclear modification factors show a characteristic structure qualitatively consistent with the expectation from model predictions that charm quarks gain sizable collective motion during the medium evolution. The improved measurements are expected to offer new constraints tomore » model calculations and help gain further insights into the hot and dense medium created in these collisions.« less

Authors:
 [1];  [2]
  1. Creighton Univ., Omaha, NE (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). et al.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); Ministry of Education and Science of the Russian Federation; National Natural Science Foundation of China (NNSFC); Chinese Academy of Science, the Ministry of Science and Technology of China and the Chinese Ministry of Education; National Research Foundation of Korea (NRF)
Contributing Org.:
STAR Collaboration
OSTI Identifier:
1489746
Alternate Identifier(s):
OSTI ID: 1501960; OSTI ID: 1503227
Report Number(s):
BNL-210840-2019-JAAM; BNL-211446-2019-JAAM
Journal ID: ISSN 2469-9985
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 99; Journal Issue: 3; 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

Adam, Jaroslav, and Arkhipkin, Dmitri. Centrality and transverse momentum dependence of D0-meson production at mid-rapidity in Au+Au collisions at √sNN = 200 GeV. United States: N. p., 2019. Web. doi:10.1103/PhysRevC.99.034908.
Adam, Jaroslav, & Arkhipkin, Dmitri. Centrality and transverse momentum dependence of D0-meson production at mid-rapidity in Au+Au collisions at √sNN = 200 GeV. United States. doi:10.1103/PhysRevC.99.034908.
Adam, Jaroslav, and Arkhipkin, Dmitri. Wed . "Centrality and transverse momentum dependence of D0-meson production at mid-rapidity in Au+Au collisions at √sNN = 200 GeV". United States. doi:10.1103/PhysRevC.99.034908.
@article{osti_1489746,
title = {Centrality and transverse momentum dependence of D0-meson production at mid-rapidity in Au+Au collisions at √sNN = 200 GeV},
author = {Adam, Jaroslav and Arkhipkin, Dmitri},
abstractNote = {Here, we report a new measurement of D0-meson production at mid-rapidity (|y|\,<\,1) in Au+Au collisions at √sNN = 200GeV utilizing the Heavy Flavor Tracker, a high resolution silicon detector at the STAR experiment. Invariant yields of D0-mesons with transverse momentum pT ≲9\,GeV/c are reported in various centrality bins (0-10%, 10-20%, 20-40%, 40-60% and 60-80%). Blast-Wave thermal models are used to fit the D0-meson pT spectra to study D0 hadron kinetic freeze-out properties. The average radial flow velocity extracted from the fit is considerably smaller than that of light hadrons (π,K and p), but comparable to that of hadrons containing multiple strange quarks (φ,Ξ¯), indicating that D0 mesons kinetically decouple from the system earlier than light hadrons. The calculated D0 nuclear modification factors re-affirm that charm quarks suffer large amount of energy loss in the medium, similar to those of light quarks for pT > 4 GeV/c in central 0-10% Au+Au collisions. At low pT, the nuclear modification factors show a characteristic structure qualitatively consistent with the expectation from model predictions that charm quarks gain sizable collective motion during the medium evolution. The improved measurements are expected to offer new constraints to model calculations and help gain further insights into the hot and dense medium created in these collisions.},
doi = {10.1103/PhysRevC.99.034908},
journal = {Physical Review C},
number = 3,
volume = 99,
place = {United States},
year = {2019},
month = {3}
}

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This content will become publicly available on March 20, 2020
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