Radiative energy loss of high energy quarks and gluons in a finite-volume quark-gluon plasma

Baier, Rudolf; Dokshitzer, Yuri L.; Mueller, Alfred H.; Peigné, Stéphane; Schiff, D.

doi:10.1016/s0550-3213(96)00553-6

Cited by 1,001 publications

(1,254 citation statements)

References 8 publications

(22 reference statements)

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“…We focus on the medium-induced radiation, as governed by the BDMPSZ mechanism [12,13,15], and ignore here effects due to vacuum radiation. In this approach, both gluon splitting and momentum broadening are controlled by a single parameterq, called the jet-quenching parameter.…”

Section: The Equation For the In-medium Qcd Cascadementioning

confidence: 99%

Angular distribution of medium-induced QCD cascades

2015

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We provide a complete description of the angular distribution of gluons in a medium-induced QCD cascade. We identify two components in the distribution, a soft component dominated by soft multiple scatterings, and a hard component dominated by a few hard scatterings. The typical angle that marks the boundary between these two components is determined analytically as a function of the energy of the observed gluon and the size of the medium. We construct the complete solution (beyond the diffusion approximation) in the regime where multiple branchings dominate the dynamics of the cascade in the form of a power series in the number of collisions with the medium particles. The coefficients of this expansions are related to the moments of the distribution in the diffusion approximation and are determined analytically. The angular distribution may be useful in phenomenological studies of jet shapes in heavy-ion collisions.

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Section: The Equation For the In-medium Qcd Cascadementioning

confidence: 99%

Angular distribution of medium-induced QCD cascades

2015

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“…In the end, results for the dynamical Q 0 scenario is close to the fixed Q 0 = 2 GeV scenario, because for a 50 GeV quark jet in a 250 MeV medium, the value of dynamical Q 0 we construct is around 2 GeV according to Eqs. (10,11). If the energy of the initial quark is increased by a factor of 4, one may observe in Fig.…”

Section: Energy Distribution and Jet Broadening In Matter+martinmentioning

confidence: 91%

“…Jet modification [7][8][9][10][11][12][13][14][15][16][17], and its associated transport coefficients [18][19][20] provide multi-scale hard probes of the QGP. Jets start with an off-shellness or virtuality Q 2 that * Corresponding Authors is typically of the order of the hard scale, orders of magnitude higher than any scale in the medium.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, in the domain of high energy and high virtuality Q 2 ≫ √q E, one expects to apply the medium modified DokshitzerGribov-Lipatov-Altarelli-Parisi (DGLAP) evolution [22,23] based on the higher-twist formalism [24,25]. As the virtuality approaches the medium induced scale, one expects to simulate a rate equation [26][27][28] based on the BDMPS/AMY [10,11,29,30] formalisms or a derivative of the higher twist formalism [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

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Multistage Monte Carlo simulation of jet modification in a static medium

Cao¹,

Park²,

Barbieri³

et al. 2017

Phys. Rev. C

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The modification of hard jets in an extended static medium held at a fixed temperature is studied using three different Monte-Carlo event generators (LBT, MATTER, MARTINI). Each event generator contains a different set of assumptions regarding the energy and virtuality of the partons within a jet versus the energy scale of the medium, and hence, applies to a different epoch in the space-time history of the jet evolution. For the first time, modeling is developed where a jet may sequentially transition from one generator to the next, on a parton-by-parton level, providing a detailed simulation of the space-time evolution of medium modified jets over a much broader dynamic range than has been attempted previously in a single calculation. Comparisons are carried out for different observables sensitive to jet quenching, including the parton fragmentation function and the azimuthal distribution of jet energy around the jet axis. The effect of varying the boundary between different generators is studied and a theoretically motivated criterion for the location of this boundary is proposed. The importance of such an approach with coupled generators to the modeling of jet quenching is discussed.

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“…This interference effect was first noticed, in a purely QED setting, by Landau, Pomeranchuk, and Migdal [11], and is called the LPM effect. In the QCD context, it has been considered by a few groups starting in the mid-1990's [12,13].…”

Section: Computing the Photon Emission Ratementioning

confidence: 99%

Electromagnetic emission and energy loss in the QGP

Moore

2004

J. Phys. G: Nucl. Part. Phys.

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Abstract. I discuss why photon production from the Quark Gluon Plasma (QGP) presents an interesting problem, both experimentally and theoretically. I show how the photon emission rate can be computed under the simplifying assumption that the QGP fully thermalizes. The theoretical issues are very similar to those for jet energy loss; so it should be possible to treat them in a common formalism and relate the predictions of one phenomenon to those of the other.Submitted to: J. Phys. G: Nucl. Phys. Photons as a deep probeThe main goals of the RHIC experimental program are, to produce and to characterize the quark-gluon plasma (QGP). The plasma is defined as being a state of matter for which the density of partons (quarks and gluons) is so great that a description in terms of hadronic degrees of freedom is impossible, which is furthermore extensive and relatively close to equilibrium. The problem is that the QGP expands, cools, and hadronizes. Even after hadronization, hadrons continue to interact; much of the information about the initial state is therefore lost. For instance, the spectrum of hadronic final states which we observe at RHIC is well characterized by a thermal model with a temperature of only about 160 MeV, too low for a QGP but reasonable for the freezeout of a hadronic gas [1]. Therefore, the hadronic observables give only rather indirect information about the QGP phase of the collision.For this reason, it was proposed years ago to study "hard" probes, meaning particles which are produced early in the collision, deep within the QGP, and which then escape with little or no interaction, giving relatively direct information about the early stages of the QGP. Shuryak proposed photons as a promising direct probe [2], and they continue to be actively investigated [3].The advantage of photons as a probe of the QGP is that any photons produced are almost sure to escape without re-interacting, so they give direct, rather than indirect or processed, information about the early stages of the heavy ion collision. The main disadvantage is that there are several sources of photons, with the concomitant problem of determining which photons arose from which source. Namely, there are• Prompt photons, those produced by the initial collisions of the partons which constitute the heavy ions being collided;

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Radiative energy loss of high energy quarks and gluons in a finite-volume quark-gluon plasma

Cited by 1,001 publications

References 8 publications

Angular distribution of medium-induced QCD cascades

Angular distribution of medium-induced QCD cascades

Multistage Monte Carlo simulation of jet modification in a static medium

Electromagnetic emission and energy loss in the QGP

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