Multiple parton scattering in nuclei: heavy quark energy loss and modified fragmentation functions

Zhang, Ben-Wei; Wang, Enke; Wang, Xin‐Nian

doi:10.1016/j.nuclphysa.2005.04.022

Cited by 38 publications

(59 citation statements)

References 52 publications

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“…Simple minded extensions of the formalism applied to light quarks have yielded theoretical results that are in moderate agreement with experimental measurements [4][5][6][7]. The agreement with measurements of the nuclear modification factor and the azimuthal anisotropy of non-photonic leptons (from the decay of open heavy flavor hadrons) at RHIC is found to improve with increasing transverse momentum (p T ) of the detected lepton.…”

Section: Introductionsupporting

confidence: 59%

Multiple scattering of heavy quarks in dense matter and the parametric prominence of drag

Abir

Kaur

Majumder³

2014

Phys. Rev. D

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The case of heavy quark propagation in dense extended matter is studied in the multiple scattering formalism of the higher twist energy loss scheme. We consider the case of deep inelastic scattering off a large nucleus. The hard lepton scatters off a heavy quark fluctuation within one of the nucleons. This heavy quark then propagates through the dense medium, multiply scattering off the gluon field of the remaining nucleons in its path. We consider the fictitious process where a heavy quark propagates through the nucleus without radiation. Invoking Soft-Collinear Effective Theory power counting arguments, we consider the case of a "semi-hard" heavy-quark where the mass is of the order of the out-going momentum and larger than the transverse momentum imparted per unit length due to scattering. In this limit, it is found that longitudinal momentum exchanges (quantified by the transport coefficientê) have a comparable effect on the off-shellness of the propagating quark, as the transverse momentum exchanges (quantified byq) which constitute the leading cause of off-shellness for propagating light quarks or gluons. Consequences of this new hierarchy for the propagation of the heavy quark in dense matter are discussed.

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Section: Introductionsupporting

confidence: 59%

Multiple scattering of heavy quarks in dense matter and the parametric prominence of drag

Abir

Kaur

Majumder³

2014

Phys. Rev. D

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“…The slope of the enhancement is sensitive to the amount of energy loss, or equivalently, the transport coefficient,q of cold nuclear matter, and the shape of the fragmentation function [228]. The energy loss used in the simulation is a factor of 0.35 less than that of light quarks as derived in [230] by taking into account the limited cone for gluon radiation caused by the larger charm quark mass. The solid symbols are for x = 0.1 and Q 2 = 10 GeV 2 .…”

Section: Propagation Of a Fast-moving Color Charge In Qcd Mattermentioning

confidence: 99%

Electron-Ion Collider: The next QCD frontier

et al. 2016

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Abstract. This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on the structure and interactions of gluon-dominated matter, with the intent to articulate it to the broader nuclear science community. It was commissioned by the managements of Brookhaven National Laboratory (BNL) and Thomas Jefferson National Accelerator Facility (JLab) with the objective of presenting a summary of scientific opportunities and goals of the EIC as a follow-up to the 2007 NSAC Long Range plan. This document is a culmination of a community-wide effort in nuclear science following a series of workshops on EIC physics over the past decades and, in particular, the focused ten-week program on "Gluons and quark sea at high energies" at the Institute for Nuclear Theory in Fall 2010. It contains a brief description of a few golden physics measurements along with accelerator and detector concepts required to achieve them. It has been benefited profoundly from inputs by the users' communities of BNL and JLab. This White Paper offers the promise to propel the QCD science program in the US, established with the CEBAF accelerator at JLab and the RHIC collider at BNL, to the next QCD frontier. Preamble Editors' note for the second editionThe first edition of this White Paper was released in 2012. In the current (second) edition, the science case for the EIC is further sharpened in view of the recent data from BNL, CERN and JLab experiments and the lessons learnt from them. Additional improvements were made by taking into account suggestions from the larger nuclear physics community including those made at the EIC Users Group meeting at Stony Brook University in July 2014, and the QCD Town Meeting at Temple University in September 2014.Abhay Deshpande, Zein-Eddine Meziani and Jian-Wei Qiu November 2014 Editors' note for the third edition Since the 2nd release of this White Paper, the NSAC's Long Range Plan (2015) was successfully completed. The EIC is a major recommendation of the US nuclear science community. In the current release (version 3) we have fixed some minor remaining errors in the text, and have added a few new references. While the core science case for the EIC remains the same, the machine designs of both options, the eRHIC at BNL and the JLEIC at JLab keep evolving. In this 3rd release of the EIC White Paper instead of making substantial changes to the machine design sections (5.1 and 5.2), we give references to the most recent machine design documents.

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“…By taking mass effects into account, the above results have also been extended to heavy quarks [18], which suffer less radiative energy loss due to the dead cone effect. Here…”

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confidence: 99%

Perturbative QCD Description of Heavy and Light Flavor Jet Quenching

Qin

Majumder

2010

Phys. Rev. Lett.

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We present a successful description of the medium modification of light and heavy flavor jets within a perturbative QCD (pQCD) based approach. Only the couplings involving hard partons are assumed to be weak. The effect of the medium on a hard parton, per unit time, is encoded in terms of three non-perturbative, related transport coefficients which describe the transverse momentum squared gained, the elastic energy loss and diffusion in elastic energy transfer. Scaling the transport coefficients with the temperature of the medium, we achieve a good description of the centrality dependence of the suppression and the azimuthal anisotropy of leading hadrons. Imposing additional constraints based on leading order (LO) Hard Thermal Loop (HTL) effective theory leads to a worsening of the fit, implying the necessity of computing transport coefficients beyond LO-HTL.PACS numbers: 12.38. Mh,25.75.Bh,12.38.Bx,13.87.Fh Experimental results from the Relativistic Heavy Ion Collider (RHIC) have established that a new kind of hot and dense partonic matter has been created in central Au+Au collisions [1]. High transverse momentum (p T ) partons created in the initial hard collisions were predicted to provide a reliable probe of this highly excited matter [2]. These partons lose energy in the dense medium leading to a depleted yield of high p T hadrons compared to that in binary scaled p+p collisions [3]. Due to the large energy scale involved, these hard partons were expected to couple weakly with the medium allowing for the use of perturbative QCD (pQCD) to describe their propagation through the dense matter. Experimentally, the basic picture of parton energy loss has been confirmed by the observation of significant suppression of the high p T yield for both light [3] and heavy flavors [4]. There now exist sophisticated (and successful) calculations of light flavor suppression [5]. Not only have these accounted for the centrality dependence and azimuthal anisotropy of the single inclusive suppression but also for photon and hadron triggered correlations on both the near [6] and away side of the trigger hadron [7].The success of pQCD based calculations of heavy flavor modification, however, has been less than satisfactory. In a prior effort, Armesto et al.[8] were able to describe both light and heavy flavor suppression in central collisions (and the azimuthal anisotropy) including only radiative energy loss. However, they required a time averaged jet transport parameterq ≡ d(∆p ⊥ ) 2 /dt ∼ 14 GeV 2 /fm for a gluon jet (p ⊥ is the momentum trasverse to the jet axis and t is the time spent in the medium), yielding a p ⊥ comparable to the energy of the parent jet and at least a factor of five larger than estimates from LO-HTL using a medium with an identical temperature profile. In a recent analysis by Wicks et al. [9], the authors incorporated both radiative and elastic energy loss. The elastic energy loss coefficientê = dE/dt was calculated in LO-HTL but the radiative energy loss was calculated in a different medium of stati...

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Multiple parton scattering in nuclei: heavy quark energy loss and modified fragmentation functions

Cited by 38 publications

References 52 publications

Multiple scattering of heavy quarks in dense matter and the parametric prominence of drag

Multiple scattering of heavy quarks in dense matter and the parametric prominence of drag

Electron-Ion Collider: The next QCD frontier

Perturbative QCD Description of Heavy and Light Flavor Jet Quenching

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