Observing light-by-light scattering at the Large Hadron Collider.
Observing light-by-light scattering at the Large Hadron Collider.
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DOI：
10.1103/physrevlett.111.080405
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发表时间：
2013-05
影响因子：
8.6
通讯作者：
D. d’Enterria;G. G. da Silveira-G.
中科院分区：
文献类型：
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作者：
D. d’Enterria;G. G. da Silveira-G.
由于质子（p）和铅（Pb）离子的电磁相互作用中存在大量准实光子通量，因此在大型强子对撞机上可以研究弹性光-光散射（γγ→γγ）。在核子-核子质心能量ε（s（NN））=14、8.8和5.5 TeV的p-p、p-Pb和Pb-Pb碰撞中，双光子质量m（γγ）>5 GeV的γγ→γγ截面分别为12 fb、26 pb和35 nb。这样的测量在Pb-Pb碰撞中没有实质性的背景，其中在典型的检测器接受和重建效率选择之后，预期每次运行约20个信号事件。
Elastic light-by-light scattering (γγ→γγ) is open to study at the Large Hadron Collider thanks to the large quasireal photon fluxes available in electromagnetic interactions of protons (p) and lead (Pb) ions. The γγ→γγ cross sections for diphoton masses m(γγ)>5 GeV amount to 12 fb, 26 pb, and 35 nb in p-p, p-Pb, and Pb-Pb collisions at nucleon-nucleon center-of-mass energies √(s(NN))=14, 8.8, and 5.5 TeV, respectively. Such a measurement has no substantial background in Pb-Pb collisions where one expects about 20 signal events per run, after typical detector acceptance and reconstruction efficiency selections.