Measurement of Direct-Photon Elliptic Flow in Pb-Pb Collisions at √sNN=2.76 TeV

被引：90
|
作者：
Lohner, Daniel [1 ]
机构：
[1] Heidelberg Univ, Inst Phys, Heidelberg, Germany
来源：
HOT QUARKS 2012: WORKSHOP FOR YOUNG SCIENTISTS ON THE PHYSICS OF ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS | 2013年 / 446卷
关键词：
D O I：
10.1088/1742-6596/446/1/012028
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：
We present the first measurement of the direct-photon elliptic flow v(2)(gamma,dir) in Pb-Pb collisions at root s(NN) = 2.76 TeV with data taken by the ALICE experiment at the LHC. The measurement provides evidence for a non-zero v(2)(gamma,dir) for 1 < p(T) < 3 GeV/c with a magnitude similar to the observed charged pion v(2)(pi +/-). In order to explain the large inverse slope parameter T-eff of the low pT direct-photon spectrum observed at LHC and RHIC, recent hydrodynamical descriptions of the direct-photon production include a substantial portion of thermal photons from the hot plasma phase. As a consequence of the early production time, v(2)(gamma,dir) is expected to be small compared to hadrons. A large v(2)(gamma,dir) might lend support for a significant direct-photon emission from late stages of the system evolution where hadron flow has developed.
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页数：4
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