Journal
PHYSICAL REVIEW C
Volume 99, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.99.054907
Keywords
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Categories
Funding
- JET Collaboration
- Office of Energy Research, Office of High Energy and Nuclear Physics, Division of Nuclear Physics, of the U.S. Department of Energy (DOE) [DE-AC02-05CH11231, DE-SC0013460, DE-FG02-05ER41367]
- U.S. National Science Foundation (NSF) [ACI-1550228, ACI-1550300, ACI-1550225, PHY-1306359, PHY-1614484]
- National Science Foundation of China (NSFC) [11221504, 11675079]
- Major State Basic Research Development Program in China [2014CB845404]
- Region Pays de la Loire (France) [2015-08473]
- German Academic Exchange Service (DAAD)
- Deutsche Forschungsgemeinschaft (DFG) [CRC-TR 211]
- European Research Council (ERC) [259684]
- Region Pays de la 1264 Loire (France) [2015-08473]
- European Research Council (ERC) [259684] Funding Source: European Research Council (ERC)
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Several transport models have been employed in recent years to analyze heavy-flavor meson spectra in high-energy heavy-ion collisions. Heavy-quark transport coefficients extracted from these models with their default parameters vary, however, by up to a factor of 5 at high momenta. To investigate the origin of this large theoretical uncertainty, a systematic comparison of heavy-quark transport coefficients is carried out between various transport models. Within a common scheme devised for the nuclear modification factor of charm quarks in a brick medium of a quark-gluon plasma, the systematic uncertainty of the extracted drag coefficient among these models is shown to be reduced to a factor of 2, which can be viewed as the smallest intrinsic systematical error band achievable at present time. This indicates the importance of a realistic hydrodynamic evolution constrained by bulk hadron spectra and of heavy-quark hadronization for understanding the final heavy-flavor hadron spectra and extracting heavy-quark drag coefficient. The transverse transport coefficient is less constrained due to the influence of the underlying mechanism for heavy-quark medium interaction. Additional constraints on transport models such as energy loss fluctuation and transverse-momentum broadening can further reduce theoretical uncertainties in the extracted transport coefficients.
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