Photonic measurements of the longitudinal expansion dynamics in relativistic heavy-ion collisions

Renk, Thorsten

doi:10.1103/physrevc.71.064905

Cited by 19 publications

(14 citation statements)

References 28 publications

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“…This has been illustrated in case of photon production in Ref. [27]. Since the momentum space anisotropy is an early stage phenomenon, this assumption is justified.…”

Section: Space-time Evolutionmentioning

confidence: 87%

Nuclear modification factor in an anisotropic quark-gluon plasma

2011

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We calculate the nuclear modification factor (R AA ) of light hadrons by taking into account the initial state momentum anisotropy of the quark gluon plasma (QGP) expected to be formed in relativistic heavy ion collisions. Such an anisotropy can result from the initial rapid longitudinal expansion of the matter. A phenomenological model for the space time evolution of the anisotropic QGP is used to obtain the time dependence of the anisotropy parameter ξ and the hard momentum scale, p hard . The result is then compared with the PHENIX experimental data to constrain the isotropization time scale, τ iso for fixed initial conditions (FIC). It is shown that the extracted value of τ iso lies in the range 0.5 ≤ τ iso ≤ 1.5. However, using fixed final multiplicity (FFM) condition does not lead to any firm conclusion about the extraction of the isotropization time. The present calculation is also extended to contrast with the recent measurement of nuclear modification factor by ALICE collaboration at √ s = 2.76 TeV. It is argued that in the present approach, the extraction of τ iso at this energy is uncertain and, therfore, refinement of the model is necessary. The sensitivity of the results on the initial conditions has been discussed. We also present the nuclear modification factor at LHC energies with √ s = 5.5 TeV.

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“…This has been illustrated in case of photon production in Ref. [27]. Since the momentum space anisotropy is an early stage phenomenon, this assumption is justified.…”

Section: Space-time Evolutionmentioning

confidence: 87%

Nuclear modification factor in an anisotropic quark-gluon plasma

2011

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“…simultaneously measuring γ-hadron correlations (and hence P (∆E) TAB for quarks), back-to-back correlations (i.e. P (∆E) T r ), thermal photons (sensitive to the longitudinal expansion [43]) and a reaction plane analysis of R AA [49] introducing a handle on the systematic variation of the in-medium pathlength distribution will be a suitable tool to extract tomographic information using hard probes.…”

Section: Discussionmentioning

confidence: 99%

Prospects of medium tomography using back-to-back hadron correlations

2007

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We discuss the prospects of extracting information about the bulk QCD matter distribution and evolution on the basis of hard hadronic back-to-back correlations in ultrarelativistic heavyion collisions. Using both hydrodynamical and parametrized evolution models for the spacetime evolution of the produced matter, which have been tested against RHIC data, we study six different setups for the spacetime dependence of hard-parton energy losses. Assuming that the energy loss of hard partons traversing the medium is radiative and calculable in the BDMPS formalism, we adjust one parameter, the quenching power scale, to the measured RAA in each of the setups and study the systematic variations of the back-to-back yield as a function of pT . We show which spacetime regions are probed by one-particle and two-particle observables and study the role of longitudinal and transverse expansion in some detail. We also comment on the importance of considering fluctuations around the average energy loss. We conclude that while current data are too limited in momentum coverage, future data for higher trigger energy might provide the lever arm in away side hadron momentum necessary to perform medium tomography, provided that sufficient precision can be achieved.

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“…Apart from transverse flow effects, the investigation of longitudinal evolution using HBT correlation measurements has been done in Ref. [13]. It is shown that the decrease of R side with p T (>2.5 GeV) provides a good indication whether transverse flow is significant or not.…”

Section: Introductionmentioning

confidence: 99%

Photons from anisotropic quark-gluon plasma

Bhattacharya

Roy

2008

Phys. Rev. C

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We calculate medium photons due to Compton and annihilation processes in an anisotropic media. The effects of time-dependent momentum-space anisotropy of quark-gluon plasma (QGP) on the medium photon production are discussed. Such an anisotropy can result from the initial rapid longitudinal expansion of the matter, created in relativistic heavy ion collisions. A phenomenological model for the time-dependence of the parton hard momentum scale, p hard (τ ), and anisotropy parameter, ξ (τ ), has been used to describe the plasma space-time evolution. We find significant dependency of photon yield on the isotropization time (τ iso ). It is shown that the introduction of early time momentum-space anisotropy can enhance the photon production by a factor of 10(1.5) (in the central rapidity region) for the free streaming (collisionally-broadened) interpolating model if we assume fixed initial condition. On the other hand, enforcing the fixed final multiplicity significantly reduces the enhancement of medium photon production.

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Photonic measurements of the longitudinal expansion dynamics in relativistic heavy-ion collisions

Cited by 19 publications

References 28 publications

Nuclear modification factor in an anisotropic quark-gluon plasma

Nuclear modification factor in an anisotropic quark-gluon plasma

Prospects of medium tomography using back-to-back hadron correlations

Photons from anisotropic quark-gluon plasma

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