New forms of QCD matter discovered at RHIC

Gyulassy, Miklós; McLerran, Larry

doi:10.1016/j.nuclphysa.2004.10.034

Cited by 1,223 publications

(1,420 citation statements)

References 164 publications

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“…Therefore the study of jet quenching in high-energy heavy-ion collisions can provide crucial information of space-time profile of parton density distribution in the early stage of heavy-ion collisions [17]. The observed suppression of single [18,19], dihadron spectra [20] and gamma-hadron correlation [21,22] in high-energy heavy-ion collisions at RHIC are all consequences of strong jet quenching and provided the evidence for the formation of a strongly coupled QGP in the center of heavy-ion collisions at RHIC [23,24]. Recent data from heavy-ion collisions at the LHC [25] have also shown a wide range of phenomena of jet quenching which point to the formation of a strongly coupled QGP similar to that formed in heavy-ion collisions at RHIC.…”

Section: Introductionmentioning

confidence: 99%

Parton energy loss and modified beam quark distribution functions in Drell–Yan process in collisions

et al. 2012

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Within the framework of generalized collinear factorization in perturbative QCD (pQCD), we study the effect of initial multiple parton scattering and induced parton energy loss in DrellYan (DY) process in proton-nucleus collisions. We express the contribution from multiple parton scattering and induced gluon radiation to the DY dilepton spectra in terms of nuclear modified effective beam quark distribution functions. The modification depends on the quark transport parameter in nuclear medium. This is similar to the final-state multiple parton scattering in deeply inelastic scattering (DIS) off large nuclei and leads to the suppression of the Drell-Yan cross section in p + A relative to p + p collisions. With the value of quark transport parameter determined from the nuclear modification of single-inclusive DIS hadron spectra as measured by the HERMES experiment, we calculate DY spectra in p + A collisions and find the nuclear suppression due to beam parton energy loss negligible at the Fermilab energy E lab =800 GeV in the kinematic region as covered by the E866 experiment. Most of the observed nuclear suppression of DY spectra in E866 experiment can be described well by parton shadowing in target nuclei as given by the EPS08 parameterization. The effect of beam parton energy loss, however, becomes significant for DY lepton pairs with large beam parton momentum fraction x ′ or small target parton momentum fraction x. We also predict the DY cross section in p + A collisions at lower beam proton energy E lab =120 GeV and show significant suppression due to initial state parton energy loss at moderately large x ′ where the effect of parton shadowing is very small.

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Section: Introductionmentioning

confidence: 99%

Parton energy loss and modified beam quark distribution functions in Drell–Yan process in collisions

et al. 2012

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“…The success of perfect fluid hydrodynamic calculations in describing the collective flow observed in heavy-ion collisions [1,2,3] suggests small viscosities of the created medium which has also lead to viewing it as being strongly coupled [4]. Nonetheless, in particular the shear viscosity cannot be arbitrarily small due to unitarity [5].…”

Section: Introductionmentioning

confidence: 99%

Viscosities in the Gluon-Plasma within a Quasiparticle Model

2009

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A phenomenological quasiparticle model, featuring dynamically generated self-energies of excitation modes, successfully describes lattice QCD results relevant for the QCD equation of state and related quantities both at zero and non-zero net baryon density. Here, this model is extended to study bulk and shear viscosities of the gluon-plasma within an effective kinetic theory approach. In this way, the compatibility of the employed quasiparticle ansatz with the apparent low viscosities of the strongly coupled deconfined gluonic medium is shown.

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“…While the degree to which the flowing medium is "perfect" [4] remains under study, the strongly-coupled nature of the color-deconfined system is remarkable. It allows treatment of the system as a system, with thermodynamic quantities.…”

Section: Introductionmentioning

confidence: 99%

Do p+p Collisions Flow at RHIC? Understanding One-Particle Distributions, Multiplicity Evolution, and Conservation Laws

Chajęcki

Lisa

2009

Nuclear Physics A

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Collective, explosive flow in central heavy ion collisions manifests itself in the mass dependence of p T distributions and femtoscopic length scales, measured in the soft sector (p T 1 GeV/c). Measured p T distributions from proton-proton collisions differ significantly from those from heavy ion collisions. This has been taken as evidence that p+p collisions generate little collective flow, a conclusion in line with naive expectations. We point out possible hazards of ignoring phase-space restrictions due to conservation laws when comparing high-and low-multiplicity final states. Already in two-particle correlation functions, we see clear signals of such phase-space restrictions in low-multiplicity collisions at RHIC. We discuss how these same effects, then, must appear in the single particle spectra. We argue that the effects of energy and momentum conservation actually dominate the observed systematics, and that p + p collisions may be much more similar to heavy ion collisions than generally thought.

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New forms of QCD matter discovered at RHIC

Cited by 1,223 publications

References 164 publications

Parton energy loss and modified beam quark distribution functions in Drell–Yan process in collisions

Parton energy loss and modified beam quark distribution functions in Drell–Yan process in collisions

Viscosities in the Gluon-Plasma within a Quasiparticle Model

Do p+p Collisions Flow at RHIC? Understanding One-Particle Distributions, Multiplicity Evolution, and Conservation Laws

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