Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC | |
ATLAS Collaboration | |
刊名 | NATURE PHYSICS
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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-+. |
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