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

Journal Article · · Physical Review. C
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We report a new measurement of D0-meson production at mid-rapidity (| y | < 1) in Au + Au collisions at $$\sqrt{s}$$$$_ {NN}$$ = 200 GeV 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 reaffirm that charm quarks suffer a 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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Univ. of Illinois, Chicago, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Ministry of Education and Science of the Russian Federation; National Natural Science Foundation of China (NSFC); 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 Organization:
STAR Collaboration
Grant/Contract Number:
SC0012704; FG02-94ER40865; AC02-05CH11231; SC0015636
OSTI ID:
1503227
Alternate ID(s):
OSTI ID: 1489746; OSTI ID: 1501960; OSTI ID: 1550885; OSTI ID: 1665939; OSTI ID: 1787630
Report Number(s):
BNL-211446-2019-JAAM; BNL-210840-2019-JAAM; DOE-UIC-ER40865-X6; PRVCAN
Journal Information:
Physical Review. C, Vol. 99, Issue 3; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 51 works
Citation information provided by
Web of Science

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