scholarly journals Towards the dynamical study of heavy-flavor quarks in the Quark-Gluon-Plasma

2014 ◽  
Vol 509 ◽  
pp. 012076 ◽  
Author(s):  
H Berrehrah ◽  
E Bratkovskaya ◽  
W Cassing ◽  
P B Gossiaux ◽  
J Aichelin
Keyword(s):  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Heavy Flavor ◽  
Dynamical Study ◽  
Heavy Flavor Quarks

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-Flavor Measurements with the ALICE Experiment at the LHC

Universe ◽  
2019 ◽  
Vol 5 (5) ◽  
pp. 130 ◽  
Author(s):  
Róbert Vértesi
Keyword(s):  
Heavy Ion ◽  
Gluon Plasma ◽  
Heavy Quarks ◽  
Heavy Flavor ◽  
Successful Completion ◽  
Alice Experiment ◽  
Ion Collisions ◽  
State Of Matter ◽  
Heavy Flavor Quarks ◽  
Dense State

Heavy quarks (charm and beauty) are produced early in the nucleus–nucleus collisions, and heavy flavor survives throughout the later stages. Measurements of heavy-flavor quarks thus provide us with means to understand the properties of the Quark–Gluon Plasma, a hot and dense state of matter created in heavy-ion collisions. Production of heavy-flavor in small collision systems, on the other hand, can be used to test Quantum-chromodynamics models. After a successful completion of the Run-I data taking period, the increased luminosity from the LHC and an upgraded ALICE detector system in the Run-II data taking period allows for unprecedented precision in the study of heavy quarks. In this article we give an overview of selected recent results on heavy-flavor measurements with ALICE experiments at the LHC.

scholarly journals Measurements of charm hadron production and anisotropic flow in Au+Au collisions at 200 GeV with the STAR experiment at RHIC

2018 ◽  
Vol 171 ◽  
pp. 18006 ◽  
Author(s):  
Sooraj Radhakrishnan
Keyword(s):  
Charm Quark ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Hadronic Decay ◽  
Heavy Flavor ◽  
Model Calculations ◽  
Anisotropic Flow ◽  
Ion Collisions ◽  
200 Gev ◽  
Heavy Flavor Quarks

Heavy flavor quarks, owing to their large masses, are predominantly produced through initial hard parton scatterings in heavy-ion collisions, and thus are excellent probes to study properties of the strongly coupled Quark Gluon Plasma (sQGP) medium produced in these collisions. Measurements of anisotropic flow harmonics of heavy flavor hadrons can provide information on the properties of the medium, including the heavy flavor transport coefficient. Charm quark hadronization mechanism in the sQGP medium can be studied through measurements of yields of different charm hadrons. In these proceedings we report on the measurements of elliptic and triangular flow harmonics of D0 mesons as well as the yield ratios of D±s/D0 and Λ±c/D0 in Au+Au collisions at [see formula in PDF] = 200 GeV at RHIC with the STAR detector. These measurements use the STAR Heavy Flavor Tracker (HFT) to reconstruct charm hadrons via their hadronic decay channels. Results are compared to model calculations and the implications on the understanding of charm quark dynamics in the medium are discussed.

scholarly journals Momentum dependence of drag coefficients and heavy flavor suppression in quark gluon plasma

2011 ◽  
Vol 84 (4) ◽  
Author(s):  
Surasree Mazumder ◽  
Trambak Bhattacharyya ◽  
Jan-e Alam ◽  
Santosh K. Das
Keyword(s):  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Momentum Dependence ◽  
Heavy Flavor ◽  
Drag Coefficients

Heavy flavor jets in ALICE

2020 ◽  
pp. 2040003
Author(s):  
Isakov Artem
Keyword(s):  
Large Mass ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Relativistic Heavy Ion Collisions ◽  
Heavy Flavor ◽  
Alice Experiment ◽  
Ion Collisions ◽  
Hadron Decay ◽  
Heavy Flavor Quarks ◽  
Mass Dependent

Heavy-flavor quarks are considered to be effective probes of the Quark–Gluon Plasma (QGP) produced in ultra-relativistic heavy-ion collisions. Since quarks have a large mass, their production takes place mostly in initial hard processes, and it is calculable using perturbative QCD. Thus, heavy flavor quarks can be considered as ideal early-generated penetrating probes of the created medium and utilized to investigate mass-dependent properties of in-medium parton energy loss. Moreover, the measurement of heavy-flavor jet production in pp, besides being a natural reference for Pb–Pb studies, allows testing pQCD calculations and models of charm fragmentation in vacuum. In addition, similar measurements in p–Pb collisions allow assessing the importance of cold nuclear matter effects. The ALICE experiment at the LHC has excellent particle tracking capabilities, that allow for a precise jet reconstruction and for the identification of [Formula: see text]-meson and beauty hadron decay vertices, displaced hundreds of micrometers from the primary interaction vertex. In this proceedings, we will report the latest heavy-flavor jet measurements performed in p–Pb and pp collisions.

scholarly journals Coupled Boltzmann transport equations of heavy quarks and quarkonia in quark-gluon plasma

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Xiaojun Yao ◽  
Weiyao Ke ◽  
Yingru Xu ◽  
Steffen A. Bass ◽  
Berndt Müller
Keyword(s):  
Quark Gluon Plasma ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Transport Equations ◽  
Distribution Functions ◽  
Heavy Flavor ◽  
Boltzmann Transport ◽  
Coupled Transport ◽  
Parton Distribution Functions ◽  
Ion Collisions

Abstract We develop a framework of coupled transport equations for open heavy flavor and quarkonium states, in order to describe their transport inside the quark-gluon plasma. Our framework is capable of studying simultaneously both open and hidden heavy flavor observables in heavy-ion collision experiments and can account for both, uncorrelated and correlated recombination. Our recombination implementation depends on real-time open heavy quark and antiquark distributions. We carry out consistency tests to show how the interplay among open heavy flavor transport, quarkonium dissociation and recombination drives the system to equilibrium. We then apply our framework to study bottomonium production in heavy-ion collisions. We include ϒ(1S), ϒ(2S), ϒ(3S), χb(1P) and χb(2P) in the framework and take feed-down contributions during the hadronic gas stage into account. Cold nuclear matter effects are included by using nuclear parton distribution functions for the initial primordial heavy flavor production. A calibrated 2 + 1 dimensional viscous hydrodynamics is used to describe the bulk QCD medium. We calculate both the nuclear modification factor RAA of all bottomonia states and the azimuthal angular anisotropy coefficient v2 of the ϒ(1S) state and find that our results agree reasonably with experimental measurements. Our calculations indicate that correlated cross-talk recombination is an important production mechanism of bottomonium in current heavy-ion experiments. The importance of correlated recombination can be tested experimentally by measuring the ratio of RAA(χb(1P)) and RAA(ϒ(2S)).

scholarly journals SLAVNOV–TAYLOR IDENTITY FOR NONEQUILIBRIUM QUARK–GLUON PLASMA

2001 ◽  
Vol 16 (08) ◽  
pp. 531-540 ◽  
Author(s):  
K. OKANO
Keyword(s):  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Polarization Tensor ◽  
Gluon Polarization ◽  
Time Path

Within the closed-time-path formalism of nonequilibrium QCD, we derive a Slavnov–Taylor (ST) identity for the gluon polarization tensor. The ST identity takes the same form in both Coulomb and covariant gauges. Application to quasi-uniform quark–gluon plasma (QGP) near equilibrium or nonequilibrium quasistationary QGP is made.

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