Energy loss of a heavy quark in the quark-gluon plasma

Braaten, Eric; Thoma, Markus H.

doi:10.1103/physrevd.44.r2625

Cited by 337 publications

(362 citation statements)

References 13 publications

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“…Actually, this represents an intrinsic uncertainty of our scheme, which -in dealing with large momentum transfer processes -should be supplemented by a microscopic kinetic calculation involving the evaluation of the Born matrix elements for the scattering of the heavy quarks with the particles of the medium [26,39,40]. However, for the sake of ease and consistency we prefer to pursue the approach developed in Sec.…”

Section: Numerical Resultsmentioning

confidence: 99%

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Transport properties and Langevin dynamics of heavy quarks and quarkonia in the Quark Gluon Plasma

Beraudo¹,

Pace²,

Alberico³

et al. 2009

Nuclear Physics A

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Quark Gluon Plasma transport coefficients for heavy quarks and QQ pairs are computed through an extension of the results obtained for a hot QED plasma by describing the heavy-quark propagation in the eikonal approximation and by weighting the gauge field configurations with the Hard Thermal Loop effective action. It is shown that such a model allows to correctly reproduce, at leading logarithmic accuracy, the results obtained by other independent approaches. The results are then inserted into a relativistic Langevin equation allowing to follow the evolution of the heavy-quark momentum spectra. Our numerical findings are also compared with the ones obtained in a strongly-coupled scenario, namely with the transport coefficients predicted (though with some limitations and ambiguities) by the AdS/CFT correspondence.

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Section: Numerical Resultsmentioning

confidence: 99%

“…[26] for the QCD case and quoting previous findings obtained in Refs. [39,40]. We now address the calculation of the momentum diffusion coefficients κ T and κ L which will enter the noise term in the Langevin equation [see Eqs.…”

Section: Langevin Approach For Heavy Quarks In the Qgp: A Brief Summarymentioning

confidence: 99%

Transport properties and Langevin dynamics of heavy quarks and quarkonia in the Quark Gluon Plasma

Beraudo¹,

Pace²,

Alberico³

et al. 2009

Nuclear Physics A

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“…This energy loss is expected to occur via medium-induced gluon radiation [21,22] and elastic collisional energy loss processes [23][24][25] and it depends on the QCD Casimir coupling factor of the parton (larger for gluons than for quarks) and on the parton mass [26][27][28][29]. Other mechanisms, such as in-medium hadron formation and dissociation, can be envisaged as particularly relevant for heavy-flavour hadrons due to their small formation times [30][31][32].…”

Section: Jhep07(2015)051mentioning

confidence: 99%

Inclusive, prompt and non-prompt J/ψ production at mid-rapidity in Pb-Pb collisions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV

Adam

Adamová

Aggarwal

et al. 2015

J. High Energ. Phys.

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Abstract:The transverse momentum (p T ) dependence of the nuclear modification factor R AA and the centrality dependence of the average transverse momentum p T for inclusive J/ψ have been measured with ALICE for Pb-Pb collisions at √ s NN = 2.76 TeV in the e + e − decay channel at mid-rapidity (|y| < 0.8). The p T is significantly smaller than the one observed for pp collisions at the same centre-of-mass energy. Consistently, an increase of R AA is observed towards low p T . These observations might be indicative of a sizable contribution of charm quark coalescence to the J/ψ production. Additionally, the fraction of non-prompt J/ψ from beauty hadron decays, f B , has been determined in the region 1.5 < p T < 10 GeV/c in three centrality intervals. No significant centrality dependence of f B is observed. Finally, the R AA of non-prompt J/ψ is discussed and compared with model predictions. The nuclear modification in the region 4.5 < p T < 10 GeV/c is found to be stronger than predicted by most models. The ALICE collaboration 26 IntroductionHeavy-ion collisions at high energies allow the study of strongly interacting matter under extreme conditions. Calculations based on Quantum-Chromo-Dynamics (QCD) on the lattice indicate that the hot and dense medium created in these collisions behaves like a strongly coupled Quark-Gluon Plasma (QGP) [1][2][3][4]. Heavy quarks are an important probe for the properties of this state of matter, since they are produced via hard partonic collisions at a very early stage and thus experience the complete evolution of the system. Quarkonium states, i.e. bound states of a heavy quark and anti-quark such as the J/ψ meson (cc state) are of particular interest. It was predicted that the J/ψ formation is suppressed in a QGP due to the screening of the cc potential in the presence of free colour charges [5]. Experimentally, a suppression of the inclusive J/ψ yield in heavy-ion collisions relative to the corresponding yield in pp, scaled by the number of binary nucleon-nucleon collisions, has been observed at the Super Proton Synchrotron (SPS) [6][7][8] and the Relativistic Heavy Ion Collider (RHIC) [9,10]. The level of suppression was found to be similar at SPS and RHIC, despite the significantly different collision energy. More recently, the nuclear modification of J/ψ was also measured for Pb-Pb collisions at the LHC [11][12][13]. While at high transverse momentum (p T > 4 GeV/c) the suppression factor is at the same level as the one observed at RHIC in the low p T region, a significant reduction of the suppression is measured towards lower p T . This has been interpreted as the effect of an additional contribution to J/ψ production at low p T , due to the combination of correlated or uncorrelated c and c quarks [14,15]. This contribution becomes sizable at LHC energies, since the number of cc pairs is much higher than at lower energies. Assuming that a deconfined phase is produced and that all the J/ψ are dissociated, this process happens at the chemical freezeout stage of the fireball ...

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“…charm (c) and beauty (b) quarks, are produced at the initial stage of the collision, almost exclusively in hard partonic scattering processes. Therefore, they interact with the medium in all phases of the system evolution, propagating through the hot and dense medium and losing energy via radiative [7,8] and collisional scattering [9][10][11] processes. Heavy-flavour hadrons and their decay products are thus effective probes to study the properties of the medium created in heavy-ion collisions.…”

Section: Introductionmentioning

confidence: 99%

Elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity in Pb-Pb collisions at s N N = 2.76 $$ \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=2.76 $$ TeV

Adam¹,

Adamová²,

Aggarwal³

et al. 2016

J. High Energ. Phys.

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Abstract:The elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity (|y| < 0.7) is measured in Pb-Pb collisions at √ s NN = 2.76 TeV with ALICE at the LHC. The particle azimuthal distribution with respect to the reaction plane can be parametrized with a Fourier expansion, where the second coefficient (v 2 ) represents the elliptic flow. The v 2 coefficient of inclusive electrons is measured in three centrality classes (0-10%, 10-20% and 20-40%) with the event plane and the scalar product methods in the transverse momentum (p T ) intervals 0.5-13 GeV/c and 0.5-8 GeV/c, respectively. After subtracting the background, mainly from photon conversions and Dalitz decays of neutral mesons, a positive v 2 of electrons from heavy-flavour hadron decays is observed in all centrality classes, with a maximum significance of 5.9σ in the interval 2 < p T < 2.5 GeV/c in semicentral collisions (20-40%). The value of v 2 decreases towards more central collisions at low and intermediate p T (0.5 < p T < 3 GeV/c). The v 2 of electrons from heavy-flavour hadron decays at mid-rapidity is found to be similar to the one of muons from heavy-flavour hadron decays at forward rapidity (2.5 < y < 4). The results are described within uncertainties by model calculations including substantial elastic interactions of heavy quarks with an expanding strongly-interacting medium. The ALICE collaboration 34 Keywords: Heavy Ion Experiments IntroductionThe main goal of the ALICE [1] experiment is the study of strongly-interacting matter at the high energy density and temperature reached in ultra-relativistic heavy-ion collisions at the Large Hadron Collider (LHC). In these collisions the formation of a deconfined state of quarks and gluons, the Quark-Gluon Plasma (QGP), is predicted by Quantum ChromoDynamic (QCD) calculations on the lattice [2][3][4][5][6]. Because of their large masses, heavy quarks, i.e. charm (c) and beauty (b) quarks, are produced at the initial stage of the collision, almost exclusively in hard partonic scattering processes. Therefore, they interact with the medium in all phases of the system evolution, propagating through the hot and dense medium and losing energy via radiative [7,8] and collisional scattering [9][10][11] processes. Heavy-flavour hadrons and their decay products are thus effective probes to study the properties of the medium created in heavy-ion collisions. Heavy-quark energy loss in strongly-interacting matter can be studied via the modification of the transverse momentum (p T ) spectra of heavy-flavour hadrons and their decay products in heavy-ion collisions with respect to the proton-proton yield scaled by the number of binary nucleon-nucleon collisions, quantified by the nuclear modification factor (R AA ). A strong suppression of open charm hadrons and heavy-flavour decay leptons is observed for p T > 3 GeV/c in central collisions, both at RHIC ( √ s NN = 200 GeV) [12][13][14][15][16] -1 - JHEP09(2016)028and LHC ( √ s NN = 2.76 TeV) [17][18][19][20] energies. The PHENIX and STAR Collabor...

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Energy loss of a heavy quark in the quark-gluon plasma

Cited by 337 publications

References 13 publications

Transport properties and Langevin dynamics of heavy quarks and quarkonia in the Quark Gluon Plasma

Transport properties and Langevin dynamics of heavy quarks and quarkonia in the Quark Gluon Plasma

Inclusive, prompt and non-prompt J/ψ production at mid-rapidity in Pb-Pb collisions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV

Elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity in Pb-Pb collisions at s N N = 2.76 $$ \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=2.76 $$ TeV

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