Heavy quark diffusion in the pre-equilibrium stage of heavy ion collisions

Das, Santosh K.; Ruggieri, Marco; Mazumder, Surasree; Greco, V.; Alam, Jan-e

doi:10.1088/0954-3899/42/9/095108

Cited by 30 publications

(28 citation statements)

References 53 publications

(70 reference statements)

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“…Heavy quarks, namely charm and beauty, are excellent probes of the system created in high energy nuclear collisions, see [10][11][12][13][14][15][16][17][18][19][20][21][22][23] and references therein. As a matter of fact, their formation time can be roughly estimated as τ form ≈ 1/(2m) with m the quark mass which gives τ form ≤ 0.1 fm/c for charm and τ form ≤ 0.04 fm/c for beauty.…”

Section: Introductionmentioning

confidence: 99%

Diffusion of charm and beauty in the Glasma

Ruggieri

Das

2018

EPJ Web Conf.

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Relativistic nuclear collisions offer a unique way to study strong interactions at very high energy. The collision process can be described within the gluon saturation framework as the interaction of two colored glasses, and because of this interaction strong longitudinal gluon fields, namely the Glasma, are produced immediately after the collision. Besides, heavy quarks are also produced in the very early stage and because of their large mass and small concentration, their motion does not affect the evolution of the Glasma, thus behaving as ideal probes of the Glasma itself. We study the evolution of the heavy quarks in the Glasma allegedly produced in high energy p-Pb collisions by solving consistently the equations of motion of the quarks in the evolving Glasma fields. We find that this motion can be understood in terms of diffusion in momentum space, similarly to the random motion of a heavy probe in a hot thermalized medium. We show how the diffusion of heavy probes affects the nuclear modification factor of D and B mesons in p-Pb collisions. *

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Section: Introductionmentioning

confidence: 99%

Diffusion of charm and beauty in the Glasma

Ruggieri

Das

2018

EPJ Web Conf.

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“…τ 0 is the proper time when the HQ starts to interact with the bulk and also the initial proper time to start the hydrodynamic evolution. In principle these time scales could be different and there have been previous studies on the preequilibrium dynamics of the HQ [23]. However, in this first study of the combined effect of drag and EM field, we work with the simple ansatz that the HQ interaction with the medium starts at the same time as the hydrodynamic expansion of the bulk.…”

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confidence: 99%

Interplay of drag by hot matter and electromagnetic force on the directed flow of heavy quarks

Chatterjee

Božek

2019

Physics Letters B

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Rapidity-odd directed flow in heavy ion collisions can originate from two very distinct sources in the collision dynamics i. an initial tilt of the fireball in the reaction plane that generates directed flow of the constituents independent of their charges, and ii. the Lorentz force due to the strong primordial electromagnetic field that drives the flow in opposite directions for constituents carrying unlike sign charges. We study the directed flow of open charm mesons D 0 and D 0 in the presence of both these sources of directed flow. The drag from the tilted matter dominates over the Lorentz force resulting in same sign flow for both D 0 and D 0 , albeit of different magnitudes. Their average directed flow is about ten times larger than their difference. This charge splitting in the directed flow is a sensitive probe of the electrical conductivity of the produced medium. We further study their beam energy dependence; while the average directed flow shows a decreasing trend, the charge splitting remains flat from √ sNN = 60 GeV to 5 TeV.

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“…Let us now discuss the temperature variations at RHIC and LHC while obtainingq enlisted in Eq. (20). For AuAu at 200 GeV/n, T 0 = 346 − 373 Mev and for Pb-Pb at 2.76 TeV/n, T 0 = 447 − 486 MeV with initial time τ 0 = 0.6 fm/c for RHIC energy and τ 0 = 0.3 fm/c for the LHC energy.…”

Section: Relation To the Jet Quenching Parameterqmentioning

confidence: 99%

“…To address this, one requires to describe the dynamics of the HQs propagating through the QGP. Therefore, one can explore the physics of the HQ transport [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] in the QGP medium as follows.The non-equilibrated HQs can travel in the equilibrated QGP medium, and one has to deal the problem within the framework of Langevin dynamics [22]. This is to say that the HQs perform random motion in the equilibrated QGP.…”

Section: Introductionmentioning

confidence: 99%

Impact of momentum space anisotropy on heavy quark dynamics in a QGP medium

Chandra

Das

2016

Phys. Rev. D

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Momentum space anisotropy present in the quark and gluon distribution functions in relativistic heavy ion collisions induces Chromo-Weibel instability in the hot QCD medium created therein. The impact of the Chromo-Weibel instability on the dynamics of a heavy-quark (HQ) traversing in the QGP medium is investigated within the framework of kinetic theory by studying the momentum and temperature behavior of HQ drag and diffusion coefficients. The physics of anisotropy is captured in an effective Vlasov term in the transport equation. The effects of the instability are handled by making a relation with the phenomenologically known jet quenching parameter in RHIC and LHC. Interestingly, the presence of instability significantly affect the temperature and momentum dependences of the HQ drag and diffusion coefficients. These results may have appreciable impact on the experimental observables such as, the nuclear suppression factor, RAA(pT ), and the elliptic flow, v2(pT ), of heavy mesons in heavy ion collisions at RHIC and LHC energies which is a matter of future investigation.

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Heavy quark diffusion in the pre-equilibrium stage of heavy ion collisions

Cited by 30 publications

References 53 publications

Diffusion of charm and beauty in the Glasma

Diffusion of charm and beauty in the Glasma

Interplay of drag by hot matter and electromagnetic force on the directed flow of heavy quarks

Impact of momentum space anisotropy on heavy quark dynamics in a QGP medium

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