Heavy-quark colorimetry of QCD matter

Dokshitzer, Yu. L.; Kharzeev, Dmitri E.

doi:10.1016/s0370-2693(01)01130-3

Cited by 900 publications

(965 citation statements)

References 21 publications

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“…We showed that the Ter-Mikayelian effect on the induced energy loss is comparable but somewhat larger than in [29]. In addition, it was shown shown that the induced contribution increases approximately linearly with L, as first reported in [33].…”

Section: Discussionsupporting

confidence: 79%

“…Since finite parton masses shield collinear k → 0 singularity [33], our numerical computations are performed with zero momentum cutoff. We see that for heavy quarks, in the energy range E ∼ 5−15 GeV, the Ter-Mikayelian effect reduces the induced energy loss in this extension of the GLV approach somewhat more than in the BDMS approximation [29]. However, on an absolute scale, this only corresponds to a change of δ(∆E (1) /E) < 0.05, which is negligible.…”

Section: Heavy Quark Energy Loss At Rhicmentioning

confidence: 78%

“…However, in ref. [29] it was pointed out that the heavy quark mass leads to a kinematical "dead cone" effect for θ < M/E that reduces significantly the induced radiative energy loss of heavy quarks. Numerical estimates indicated that the quenching of charm quarks may be about a half that of light quarks.…”

Section: Introductionmentioning

confidence: 99%

“…We showed that the apparent null effect observed for heavy quarks via single electrons could in part be due to a reduction of the leading O(χ 0 ) order radiation associated with the initial hard production process. In this sense, there are two opposing medium effects: (1) at O(χ 0 ), the Ter-Mikayelian plasmon dispersion effect that reduces the associated hard radiation energy loss [33] and (2) at O(χ n≥1 ), the induced radiative energy loss that increases the total radiative energy loss albeit with a reduced efficiency due to the dead cone effect [29]. The detailed derivation of the QCD Ter-Mikayelian effect was presented in paper II [33].…”

Section: Introductionmentioning

confidence: 99%

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Heavy quark radiative energy loss in QCD matter

2004

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Heavy quark medium induced radiative energy loss is derived to all orders in opacity, (L/λg) n . The analytic expression generalizes the GLV opacity expansion for massless quanta to heavy quarks with mass M in a QCD plasma with a gluon dispersion characterized by an asymptotic plasmon mass, mg = gT / √ 2. Remarkably, we find that the general result is obtained by simply shifting all frequencies in the GLV series by (m 2 g +x 2 M 2 )/(2xE). Numerical evaluation of the first order in opacity energy loss shows that both charm and bottom energy losses are much closer to the incoherent radiation limit than light partons in nuclear collisions at both RHIC and LHC energies. However, the radiation lengths of heavy quarks remain large compared to nuclear dimensions and hence high pT heavy quark production is volume rather than surface dominated.

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Section: Discussionsupporting

confidence: 79%

Section: Heavy Quark Energy Loss At Rhicmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heavy quark radiative energy loss in QCD matter

2004

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“…Quarks are expected to lose less energy than gluons as a consequence of their smaller colour factor. In addition, the so-called "dead-cone effect" is expected to reduce small-angle gluon radiation of heavy quarks when compared to both gluons and light quarks [3][4][5]. Energy loss can be studied using the nuclear modification factor (R AA ), defined as the ratio of the PbPb yield to the pp crosssection scaled by the nuclear overlap function [6].…”

mentioning

confidence: 99%

Production of D⁰ meson in pp and PbPb Collisions at √S_NN = 5.02 TeV with CMS

Lee

2018

EPJ Web Conf.

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Abstract. Heavy flavour mesons are used as powerful tools for the study of the strongly interacting medium in heavy ion collisions as heavy quarks are sensitive to the transport properties of the medium. In these proceedings, D 0 nuclear modification factors, comparing the yields in PbPb and pp collisions, and azimuthal anisotropies in Heavy quarks are effective probes to study the properties of the deconfined medium created in heavy ion collisions. These quarks are mostly produced in primary hard QCD scatterings with a production timescale that is shorter than the formation time of the Quark Gluon Plasma (QGP) [1,2]. Therefore, they carry information about the early stages of the QGP. During their propagation through the medium, heavy quarks lose energy via radiative and collisional interactions with the medium constituents. Quarks are expected to lose less energy than gluons as a consequence of their smaller colour factor. In addition, the so-called "dead-cone effect" is expected to reduce small-angle gluon radiation of heavy quarks when compared to both gluons and light quarks [3][4][5]. Energy loss can be studied using the nuclear modification factor (R AA ), defined as the ratio of the PbPb yield to the pp crosssection scaled by the nuclear overlap function [6]. Moreover, the azimuthal anisotropy of produced D 0 mesons can be characterized by the Fourier coefficients v n in the azimuthal angle (φ) distribution of the hadron yield, dN/dφ ∝ 1 + 2 n v n cos[n(φ − Ψ n )], where Ψ n is the azimuthal angle of the direction of the maximum particle density of the n th harmonic in the transverse plane [7]. At low transverse momentum (p T ), the charm hadron v n coefficient can help quantify the extent to which charm quarks flow with the medium, which is a good measure of their interaction strength. The measurements of R AA and v n can also help explore the coalescence production mechanism for charm hadrons where charm quarks recombine with light quarks from the medium, which could also lead to positive charm hadron v n [8,9]. At high p T , the charm hadron v n coefficient can constrain the path length dependence of charm quark energy loss [10,11], complementary to the R AA measurements. Precise measurements of the R AA and the azimithal anisotropy of particles containing both light and heavy quarks can thus provide important tests of QCD predictions at extreme densities and temperatures. In these proceedings, the production of prompt D 0 mesons in PbPb collisions at 5.02 TeV is measured for the first time

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