Light-by-light scattering in ultra-peripheral Pb plus Pb collisions at √sNN=5.02 TeV with the ATLAS detector

被引：0
作者：
Janus, Piotr [1 ]
机构：
[1] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, Krakow, Poland
来源：
NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS | 2017年 / 289卷
关键词：
Heavy Ion; UPC; Light-by-light;
D O I：
10.1016/j.nuclphysbps.2017.05.112
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
Light-by-light scattering (gamma gamma -> gamma gamma) is a quantum-mechanical process that is forbidden in the classical theory of electrodynamics. This reaction is accessible for the first time at the Large Hadron Collider thanks to the large electromagnetic field strengths generated by ultra-relativistic colliding lead (Pb) ions. Using 480 mu b(-1) of Pb+Pb collision data recorded at a centre-of-mass energy per nucleon pair of 5.02 TeV by the ATLAS detector, we report evidence for the (gamma gamma -> gamma gamma) process. A total of 13 candidate events are observed with a background expectation of 2.6 +/- 0.7 events. After background subtraction and analysis corrections, the fiducial cross-section of the process Pb + Pb (gamma gamma) -> Pb-(*)+Pb-(*) gamma gamma has been measured to be 70 +/- 24 (stat.) +/- 17 (syst.) nb, which is in agreement with the Standard Model predictions.
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页码：479 / 482
页数：4
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