Effects of initial-state fluctuations on jet-energy loss

Zhang, Hanzhong; Song, Taesoo; Ko, Che Ming

doi:10.1103/physrevc.87.054902

Cited by 6 publications

(9 citation statements)

References 54 publications

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“…As an outlook, we plan to study the effect of event-by-event fluctuations as presently done e.g. in [91][92][93]. almost energy independent at the LHC.…”

Section: Discussionmentioning

confidence: 99%

Energy versus centrality dependence of the jet quenching parameter $$\hat{q}$$ q ^ at RHIC and LHC: a new puzzle?

et al. 2016

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The central goal of jet quenching studies in high-energy nuclear collisions is the characterization of those QCD medium properties that are accessible by these probes. Most of the discussion in the last years has been focused on the determination of the jet quenching parameter, . We present here an extraction of this parameter using data of inclusive particle suppression at RHIC and LHC energies for different centralities. Our approach consists in fitting a K factor that quantifies the departure of this parameter from an ideal estimate, , where is determined by the local medium quantities as provided by hydrodynamical calculations. We find that this K factor is larger at RHIC than at the LHC, as obtained already in previous analyses, but, surprisingly, it is almost independent of the centrality of the collision. Taken at face value, the K factor would not depend on the local properties of the medium as energy density or temperature, but on global collision quantities such as the center of mass energy. This is a very intriguing, unexpected possibility for which we cannot yet provide a clear interpretation. We also comment on the limitations of the formalism that may affect this conclusion.

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“…As an outlook, we plan to study the effect of event-by-event fluctuations as presently done e.g. in [91][92][93]. almost energy independent at the LHC.…”

Section: Discussionmentioning

confidence: 99%

Energy versus centrality dependence of the jet quenching parameter $$\hat{q}$$ q ^ at RHIC and LHC: a new puzzle?

et al. 2016

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“…In Ref. [51] it was found that with the inclusion of the transverse expansion of the medium, i.e., using a (2+1)-dimensional hydrodynamic model, jet energy loss is enhanced when the initial state fluctuation is incorporated. A detailed investigation has also been implemented in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…The influence of the initial state fluctuations on heavy quarks has not yet been studied. There have been similar studies of the effect of the initial state fluctuations in the context of high p T light flavor jets [49,50,51], but no unified conclusion has been reached yet. For instance, Ref.…”

Section: Introductionmentioning

confidence: 99%

The influence of initial state fluctuations on heavy quark energy loss in relativistic heavy-ion collisions

Cao¹,

Huang²,

Qin³

et al. 2015

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

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Abstract.We study the effects of initial state fluctuations on the dynamical evolution of heavy quarks inside a quark-gluon plasma created in relativistic heavy-ion collisions. The evolution of heavy quarks in QGP matter is described utilizing a modified Langevin equation that incorporates the contributions from both collisional and radiative energy loss. The spacetime evolution of the fireball medium is simulated with a (2+1)-dimensional viscous hydrodynamic model. We find that when the medium traversed by the heavy quark contains a fixed amount of energy, heavy quarks tend to lose more energy for greater fluctuations of the medium density. This may result in a larger suppression of heavy flavor observables in a fluctuating QGP matter than in a smooth one. The possibility of using hard probes to infer the information of initial states of heavy-ion collisions is discussed.

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“…In particular, we discuss the influence of fluctuating versus smooth initial conditions. This latter aspect was studied in the frame-work of (light-hadron) jet physics [15][16][17], but only recently attracted attention in the context of heavy-quark observables [18], where contrary to the present work it is found that the energy loss of heavy quarks is enhanced in a medium with local fluctuations. …”

Section: Introductionmentioning

confidence: 93%

D mesons in non-central heavy-ion collisions: Fluctuating vs. averaged initial conditions

et al. 2014

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The suppression of D mesons in non-central heavy-ion collisions is investigated. The anisotropy in collisions at finite impact parameter leads to an ordering of all-angle, in-and out-of-plane nuclear modification factors due to the different in-medium path lengths. Within our MC@sHQ+EPOS model of heavy-quark propagation in the QGP we demonstrate that fluctuating initial conditions lead to an effective reduction of the energy loss of heavy quarks, which is seen in a larger nuclear modification factor at intermediate and high transverse momenta. The elliptic flow at small transverse momenta is reduced.

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Effects of initial-state fluctuations on jet-energy loss

Cited by 6 publications

References 54 publications

Energy versus centrality dependence of the jet quenching parameter $$\hat{q}$$ q ^ at RHIC and LHC: a new puzzle?

Energy versus centrality dependence of the jet quenching parameter $$\hat{q}$$ q ^ at RHIC and LHC: a new puzzle?

The influence of initial state fluctuations on heavy quark energy loss in relativistic heavy-ion collisions

D mesons in non-central heavy-ion collisions: Fluctuating vs. averaged initial conditions

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