Medium-induced jet absorption in relativistic heavy-ion collisions

Feng, Haidong; Jia, J.

doi:10.1103/physrevc.71.034909

Cited by 97 publications

(156 citation statements)

References 53 publications

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“…A major problem, however, is that the jets escaping the medium stem from the corona of the fireball [30,31,60,64] and thus do not carry much information from the dense medium. Nevertheless, 'far-side' jet suppression appears to be a promising observable since the prehadronic (color neutral) interactions employed so far lead to a suppression that is dominantly characterized by a linear length scale (cf.…”

Section: Discussionmentioning

confidence: 99%

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Jet quenching by (pre-)hadronic final state interactions at RHIC

Gallmeister

Cassing

2005

Nuclear Physics A

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Within a hadron-string dynamical transport approach (HSD) we investigate the attenuation of high transverse momentum (p ⊥ ) hadrons as well as the suppression of 'near-side' and 'far-side' jets in Au + Au collisions at invariant energies √ s = 200 GeV and √ s = 62.4 GeV in comparison to the data available from the Relativistic Heavy-Ion Collider (RHIC). From our transport studies we find that a significant part of the high p ⊥ hadron attenuation seen experimentally can be attributed to inelastic interactions of 'leading' pre-hadrons with the dense hadronic environment. In addition, we also show results of 'near-side' and 'far-side' angular correlations of high p ⊥ particles from Au+Au collisions at √ s = 200 GeV and √ s = 62.4 GeV within this (pre-)hadronic attenuation scenario. It turns out that the 'near-side' correlations are unaltered -in accordance with experiment -whereas the 'far-side' correlations are suppressed by up to ∼ 60% in central collisions. Since a much larger suppression is observed experimentally for these reactions in central reactions we conclude that there should be strong additional (and earlier) partonic interactions in the dense and possibly colored medium created in Au+Au collisions at RHIC.

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Section: Discussionmentioning

confidence: 99%

“…Ref. [60]). Note in addition that the relation A part (b) is model dependent for very peripheral reactions (small A part ).…”

Section: /3mentioning

confidence: 99%

Jet quenching by (pre-)hadronic final state interactions at RHIC

Gallmeister

Cassing

2005

Nuclear Physics A

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“…Recently, several phenomenological analyses have used the medium modifications of high-p T hadron production to extract information about the energy density attained in nucleus-nucleus collisions at the RHIC [24,26,27,31]. These models also account successfully for the centrality dependence of the suppression pattern [27,31,32] and the reduction of leading back-to-back correlation [27,31,32]. However, they tend to underpredict [31,32] the elliptic flow v 2 (p T ) at high transverse momentum, which is thought to originate from parton energy loss in an azimuthally asymmetric geometry [28,33].…”

Section: Introductionmentioning

confidence: 99%

“…These models also account successfully for the centrality dependence of the suppression pattern [27,31,32] and the reduction of leading back-to-back correlation [27,31,32]. However, they tend to underpredict [31,32] the elliptic flow v 2 (p T ) at high transverse momentum, which is thought to originate from parton energy loss in an azimuthally asymmetric geometry [28,33]. In nucleus-nucleus collisions at the RHIC and at the CERN Super Proton Synchrotron (SPS), there is strong experimental evidence that the produced medium is only locally--if at allequilibrated and is thus characterized only locally by its energy density.…”

Section: Introductionmentioning

confidence: 99%

Low-pTcollective flow induces high-pTjet quenching

2005

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Data on low-p T hadronic spectra are widely regarded as evidence of a hydrodynamic expansion in nucleusnucleus collisions. In this interpretation, different hadron species emerge from a common medium that has built up a strong collective velocity field. Here we show that the existence of a collective flow field implies characteristic modifications of high-p T parton fragmentation. We generalize the formalism of parton energy loss to the case of flow-induced oriented momentum transfer. We also discuss how to embed this calculation in hydrodynamic simulations. Flow effects are found to result generically in characteristic asymmetries in the η × φ plane of jet-energy distributions and of multiplicity distributions associated with high-p T trigger particles. However, collective flow also contributes to the medium-induced suppression of single inclusive high-p T hadron spectra. In particular, we find that low-p T elliptic flow can induce a sizable additional contribution to the high-p T azimuthal asymmetry by selective elimination of those hard partons that propagate with significant inclination against the flow field. This reduces, at least partially, the recently observed problem that models of parton energy loss tend to underpredict the large azimuthal asymmetry v 2 of high-p T hadronic spectra in semiperipheral Au + Au collisions.

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“…Models based on this picture [7][8][9][10][11][12][13] account for the main modifications of high-p T hadron production in nucleus-nucleus collisions at RHIC, namely the strong suppression of single inclusive hadron spectra, their centrality dependence [14][15][16][17][18][19], the corresponding suppression of leading back-to-back correlations [20], and high-p T hadron production with respect to the reaction plane [21]. To further test the microscopic dynamics of medium-induced parton energy loss, two classes of measurements are now gradually coming into experimental reach [22]: First, high-p T particle correlations [23][24][25], jet shapes and jet multiplicity distributions [26][27][28][29] will test the predicted relation between the energy loss of the leading parton, the transverse momentum broadening of the parton shower, and the softening of its multiplicity distribution.…”

Section: Introductionmentioning

confidence: 99%

Testing the color charge and mass dependence of parton energy loss with heavy-to-light ratios at BNL RHIC and CERN LHC

et al. 2005

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The ratio of nuclear modification factors of high-p T heavy-flavored mesons to lightflavored hadrons ("heavy-to-light ratio") in nucleus-nucleus collisions tests the partonic mechanism expected to underlie jet quenching. Heavy-to-light ratios are mainly sensitive to the mass and color-charge dependences of medium-induced parton energy loss. Here, we assess the potential for identifying these two effects in D and B meson production at RHIC and at the LHC. To this end, we supplement the perturbative QCD factorized formalism for leading hadron production with radiative parton energy loss. For D meson spectra at high but experimentally accessible transverse momentum (10 < ∼ p T < ∼ 20 GeV) in Pb-Pb collisions at the LHC, we find that charm quarks behave essentially like light quarks. However, since light-flavored hadron yields are dominated by gluon parents, the heavy-to-light ratio of D mesons is a sensitive probe of the color charge dependence of parton energy loss. In contrast, due to the larger b quark mass, the medium modification of B mesons in the same kinematical regime provides a sensitive test of the mass dependence of parton energy loss. At RHIC energies, the strategies for identifying and disentangling the color charge and mass dependence of parton energy loss are more involved because of the smaller kinematical range accessible. We argue that at RHIC, the kinematical regime best suited for such an analysis of D mesons is 7 < ∼ p T < ∼ 12 GeV, whereas the study of lower transverse momenta is further complicated due to the known dominant contribution of additional, particle species dependent, non-perturbative effects.

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Medium-induced jet absorption in relativistic heavy-ion collisions

Cited by 97 publications

References 53 publications

Jet quenching by (pre-)hadronic final state interactions at RHIC

Jet quenching by (pre-)hadronic final state interactions at RHIC

Low-pTcollective flow induces high-pTjet quenching

Testing the color charge and mass dependence of parton energy loss with heavy-to-light ratios at BNL RHIC and CERN LHC

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