Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC

doi:10.1038/NPHYS4208

	Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC
	ATLAS Collaboration
刊名	NATURE PHYSICS
	2017
卷号	13 期号:9 页码:852-+
ISSN号	1745-2473
DOI	10.1038/NPHYS4208
文献子类	Article
英文摘要	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 at the Large Hadron Collider thanks to the large electromagnetic field strengths generated by ultra-relativistic colliding lead ions. Using 480 mu b(-1) of lead-lead collision data recorded at a centre-of-mass energy per nucleon pair of 5.02 TeV by the ATLAS detector, here we report evidence for light-by-light scattering. A total of 13 candidate events were observed with an expected background of 2.6 +/- 0.7 events. After background subtraction and analysis corrections, the fiducial cross-section of the process Pb + Pb (gamma gamma) -> Pb-(center dot) + Pb-(center dot) gamma gamma, for photon transverse energy E-T > 3 GeV, photon absolute pseudorapidity vertical bar eta vertical bar < 2.4, diphoton invariant mass greater than 6 GeV, diphoton transverse momentum lower than 2 GeV and diphoton acoplanarity below 0.01, is measured to be 70 +/- 24 (stat.) +/- 17 (syst.) nb, which is in agreement with the standard model predictions.
电子版国际标准刊号	1745-2481
WOS关键词	DELBRUCK SCATTERING ; PERIPHERAL COLLISIONS ; PAIR PRODUCTION ; GAMMA-GAMMA ; COLLIDERS ; POSITRON ; ENERGIES ; PHYSICS
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000409235100017
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284468]
专题	高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	ATLAS Collaboration. Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC[J]. NATURE PHYSICS,2017,13(9):852-+.
APA	ATLAS Collaboration.(2017).Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC.NATURE PHYSICS,13(9),852-+.
MLA	ATLAS Collaboration."Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC".NATURE PHYSICS 13.9(2017):852-+.