Direct photon measurements in pp and Pb-Pb collisions with the ALICE experiment

被引：1
|
作者：
Germain, M. [1 ]
机构：
[1] Univ Nantes, IMT Atlantique, SUBATECH, CNRS,IN2P3, Nantes, France
来源：
NUCLEAR PHYSICS A | 2017年 / 967卷
关键词：
photons; direct photons; QGP; electromagnetic probes; heavy-ions; pQCD; NLO;
D O I：
10.1016/j.nuclphysa.2017.05.094
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：
Direct photon production in heavy-ion collisions provides a valuable set of observables to study the hot QCD medium. The direct photons are produced at different stages of the collision and escape the medium unaffected. In heavy-ion collisions, the direct photon yield at high transverse momentum (p(T)> 5 GeV/c) is dominated by prompt photons produced in hard scattering of incoming partons and provides information on nuclear parton distribution functions and on the initial parton dynamics. The low momentum component (P-r less than or similar to 5 GeV/c) of the direct photon production is dominated by thermal radiation by the hot and dense matter created, carrying information on its space-time evolution, collective flow and temperature. We present recent ALICE results on direct photon production Pb-Pb collisions at 2.76 TeV and on direct photon production in pp at 7 TeV using isolation techniques. The results are compared to theoretical predictions and previous measurements.
引用
收藏
页码：696 / 699
页数：4
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