Enhancement of thermal photon production in event-by-event hydrodynamics

被引：49

作者：

Chatterjee, Rupa ^{[1
]}

Holopainen, Hannu ^{[1
,2
]}

Renk, Thorsten ^{[1
,2
]}

Eskola, Kari J. ^{[1
,2
]}

机构：

[1] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland

[2] Univ Jyvaskyla, Helsinki Inst Phys, FI-40014 Jyvaskyla, Finland

来源：

PHYSICAL REVIEW C | 2011年 / 83卷 / 05期

基金：

芬兰科学院;

关键词：

ENERGY; FLOW;

D O I：

10.1103/PhysRevC.83.054908

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Thermal photon emission is widely believed to reflect properties of the earliest, hottest evolution stage of the medium created in ultrarelativistic heavy-ion collisions. Previous computations of photon emission have been carried out using a hydrodynamical medium description with smooth, averaged initial conditions. Recently, more sophisticated hydrodynamical models that calculate observables by averaging over many evolutions with event-by-event fluctuating initial conditions (ICs) have been developed. Given their direct connection to the early time dynamics, thermal photon emission appears to be an ideal observable to probe fluctuations in the medium initial state. In this work, we demonstrate that including fluctuations in the ICs may lead to an enhancement of the thermal photon yield of about a factor of 2 in the region 2 < p(T) < 4 GeV/c (where thermal photon production dominates the direct photon yield) compared to a scenario using smooth, averaged ICs. Consequently, a much better agreement with PHENIX data is found. This can be understood in terms of the strong temperature dependence of thermal photon production, translating into a sensitivity to the presence of hotspots in an event and thus establishing thermal photons as a suitable probe to characterize IC fluctuations.

引用

页数：5

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