scholarly journals A data-drive analysis for heavy quark diffusion coefficient

2018 ◽  
Vol 171 ◽  
pp. 18001
Author(s):  
Yingru Xu ◽  
Marlene Nahrgang ◽  
Shanshan Cao ◽  
Jonah E. Bernhard ◽  
Steffen A. Bass
Keyword(s):  
Diffusion Coefficient ◽  
Data Analysis ◽  
Heavy Quark ◽  
Quark Gluon Plasma ◽  
Bayesian Model ◽  
Gluon Plasma ◽  
Spatial Diffusion ◽  
Momentum Dependence ◽  
Langevin Model ◽  
Zero Momentum

We apply a Bayesian model-to-data analysis on an improved Langevin framework to estimate the temperature and momentum dependence of the heavy quark diffusion coefficient in the quark-gluon plasma (QGP). The spatial diffusion coefficient is found to have a minimum around 1-3 near Tc in the zero momentum limit, and has a non-trivial momentum dependence. With the estimated diffusion coefficient, our improved Langevin model is able to simultaneously describe the D-meson RAA and v2 in three different systems at RHIC and the LHC.

scholarly journals Data-driven extraction of heavy quark diffusion in quark-gluon plasma

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
Shuang Li ◽  
Jinfeng Liao
Keyword(s):  
Diffusion Coefficient ◽  
Heavy Quark ◽  
Quark Gluon Plasma ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Data Driven ◽  
Strong Increase ◽  
Heavy Flavor ◽  
Modeling Framework ◽  
Wide Range

Abstract Heavy quark production provides a unique probe of the quark-gluon plasma transport properties in heavy ion collisions. Experimental observables like the nuclear modification factor $$R_\mathrm{AA}$$RAA and elliptic anisotropy $$v_\mathrm{2}$$v2 of heavy flavor mesons are sensitive to the heavy quark diffusion coefficient. There now exist an extensive set of such measurements, which allow a data-driven extraction of this coefficient. In this work, we make such an attempt within our recently developed heavy quark transport modeling framework (Langevin-transport with Gluon Radiation, LGR). A question of particular interest is the temperature dependence of the diffusion coefficient, for which we test a wide range of possibility and draw constraints by comparing relevant charm meson data with model results. We find that a relatively strong increase of diffusion coefficient from crossover temperature $$T_c$$Tc toward high temperature is preferred by data. We also make predictions for Bottom meson observables for further experimental tests.

scholarly journals Heavy-quark dynamics in a hydrodynamically evolving medium

2018 ◽  
Vol 171 ◽  
pp. 04003
Author(s):  
Marlene Nahrgang ◽  
Jörg Aichelin ◽  
Pol Bernard Gossiaux ◽  
Klaus Werner
Keyword(s):  
Heavy Quark ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Heavy Quarks ◽  
Collective Flow ◽  
Recent Advances

In this talk we will discuss the recent advances in describing heavy-quark dynamics in the quark-gluon plasma (QGP), which evolves hydrodynamically. Special emphasis is put on the collective flow of the heavy-quarks with the medium constituents, for which we present our latest results obtained within the MC@sHQ+EPOS2 model at √s = 5 TeV.

Energy change of a heavy quark in a viscous quark–gluon plasma with fluctuations

2016 ◽  
Vol 953 ◽  
pp. 176-189 ◽  
Author(s):  
Bing-feng Jiang ◽  
De-fu Hou ◽  
Jia-rong Li
Keyword(s):  
Heavy Quark ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Energy Change
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