Energy loss of a heavy quark produced in a finite-size quark–gluon plasma

Gossiaux, Pol Bernard; Aichelin, J.; Brandt, C.; Gousset, Thierry; Peigné, Stéphane

doi:10.1088/0954-3899/34/8/s103

Cited by 8 publications

(10 citation statements)

References 12 publications

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“…Contrary to what was implicitly done in [15], this self-energy contribution should not be counted as 'energy loss' as it is part of the charge asymptotic state. With an accurate definition of energy loss in terms of asymptotic states [18], we find that the retardation time of purely collisional energy loss is quite small, t ret ∼ 1/m D , instead of t ret ∝ γ/m D as argued in [15].…”

Section: Jhep04(2007)012mentioning

confidence: 64%

“…We indeed stress that in the academic case of an infinite QGP, the mechanical work W calculated in [15] should not be interpreted as an observable energy loss (contrary to what was done in [15]). This is due to the fact that the quark asymptotic (t = +∞) states are different in vacuum and in an infinite QGP [18].…”

Section: Jhep04(2007)012mentioning

confidence: 99%

“…Before doing that let us discuss (see also [18]) the incorrect interpretation which was done in [15]. In [15] the stationary collisional loss −∆E coll (L) ∝ L [19] was added to d(L), and the result interpreted as the quark energy loss −∆E(L) in a infinite plasma.…”

Section: Jhep04(2007)012mentioning

confidence: 99%

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Energy loss of a heavy quark produced in a finite size medium

Gossiaux

Peigné

Brandt

et al. 2007

J. High Energy Phys.

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Energy loss of a heavy quark produced in a finite size medium Abstract: We study the medium-induced energy loss −∆E 0 (L p ) suffered by a heavy quark produced at initial time in a quark-gluon plasma, and escaping the plasma after travelling the distance L p . The heavy quark is treated classically, and within the same framework −∆E 0 (L p ) consistently includes: the loss from standard collisional processes, initial bremsstrahlung due to the sudden acceleration of the quark, and transition radiation. The radiative loss induced by rescatterings −∆E rad (L p ) is not included in our study. For a ultrarelativistic heavy quark with momentum p 10 GeV, and for a finite plasma with L p 5 fm, the loss −∆E 0 (L p ) is strongly suppressed compared to the stationary collisional contribution −∆E coll (L p ) ∝ L p . Our results support that −∆E rad is the dominant contribution to the heavy quark energy loss (at least for L p 5 fm), as indeed assumed in most of jet-quenching analyses. However they might raise some question concerning the RHIC data on large p ⊥ electron spectra.

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Section: Jhep04(2007)012mentioning

confidence: 64%

Section: Jhep04(2007)012mentioning

confidence: 99%

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Energy loss of a heavy quark produced in a finite size medium

Gossiaux

Peigné

Brandt

et al. 2007

J. High Energy Phys.

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“…In fact, the results in Refs. [13,19] can be viewed as meaning that as long as the medium size is larger than the Debye radius, the collisional energy loss for on massshell particles in a finite size medium is not suppressed as compared to the infinite medium case. The situation changes when introducing the in-medium particles' life-time.…”

Section: Discussionmentioning

confidence: 99%

“…Using Eqs. (17) - (19), the averaged over initial, summed over all other spins, matrix element squared describing the underlying scattering process in vacuum is given by…”

Section: Energy Lossmentioning

confidence: 99%

Collisional parton energy loss in a finite size QCD medium reexamined: Off-mass-shell effects

et al. 2008

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We study the collisional energy loss mechanism for particles produced off mass-shell in a finite size QCD medium. The off mass-shell effects introduced are to consider particles produced in wave packets instead of plane waves and the length scale associated to an in-medium particles' life-time. We show that these effects reduce the energy loss as compared to the case when the particles are described as freely propagating from the source. The reduction of the energy loss is stronger as this scale becomes of the order or smaller than the medium size. We discuss possible consequences of the result on the description of the energy loss process in the parton recombination scenario.

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Early-time energy loss in a strongly-coupled SYM plasma

Güijosa

Pedraza

2011

J. High Energ. Phys.

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We carry out an analytic study of the early-time motion of a quark in a stronglycoupled maximally-supersymmetric Yang-Mills plasma, using the AdS/CFT correspondence. Our approach extracts the first thermal effects as a small perturbation of the known quark dynamics in vacuum, using a double expansion that is valid for early times and for (moderately) ultrarelativistic quark velocities. The quark is found to lose energy at a rate that differs significantly from the previously derived stationary/late-time result: it scales like T 4 instead of T 2 , and is associated with a friction coefficient that is not independent of the quark momentum. Under conditions representative of the quark-gluon plasma as obtained at RHIC, the early energy loss rate is a few times smaller than its late-time counterpart. Our analysis additionally leads to thermally-corrected expressions for the intrinsic energy and momentum of the quark, in which the previously discovered limiting velocity of the quark is found to appear naturally.

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Energy loss of a heavy quark produced in a finite-size quark–gluon plasma

Cited by 8 publications

References 12 publications

Energy loss of a heavy quark produced in a finite size medium

Energy loss of a heavy quark produced in a finite size medium

Collisional parton energy loss in a finite size QCD medium reexamined: Off-mass-shell effects

Early-time energy loss in a strongly-coupled SYM plasma

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