Isolated photon measurements in pp and PbPb collisions with CMS

被引：0
|
作者：
Barbieri, Richard Alexander [1 ]
机构：
[1] MIT, Cambridge, MA 02139 USA
来源：
NUCLEAR PHYSICS A | 2014年 / 932卷
基金：
英国科学技术设施理事会;
关键词：
CMS; Heavy ion; Photon; Jet; Gamma; Gamma-jet; GLUON; JETS;
D O I：
10.1016/j.nuclphysa.2014.10.026
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 report new measurements using isolated photons based on the high statistics 2.76 TeV pp reference data collected in 2013. The nuclear modification factors of reconstructed isolated photons, obtained by the comparison of heavy ion collisions and pp data, are presented and provide useful constraints to the nuclear parton distribution functions. For events containing a high PT isolated photon with an associated jet, the photon + jet PT imbalance is studied as a function of collision centrality and compared to pp data and model calculations. These measurements allow an unbiased characterization of the in-medium parton energy loss. (c) 2014 CERN. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：442 / 446
页数：5
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