arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1305.7142hep-phhep-exnucl-exnucl-th
收藏

在大型强子对撞机上观测逐光散射

Observing light-by-light scattering at the Large Hadron Collider

David d'Enterria, Gustavo G. da Silveira

摘要:

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对弹性光-光散射($γγ\toγγ$)进行研究。在核子-核子质心能量$\sqrt{s_{NN}}$ = 14 TeV、8.8 TeV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$γγ\toγγ$截面分别为105 fb、260 pb和370 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70个信号事件。

英文摘要:

Elastic light-by-light scattering, $γγ\toγγ$, is open to study at the Large Hadron Collider thanks to the large quasi-real photon fluxes available in electromagnetic interactions of protons (p) and lead (Pb) ions. The $γγ\toγγ$ cross sections for diphoton masses $m_{γγ} > 5$ GeV amount to 105 fb, 260 pb, and 370 nb in p-p, p-Pb, and Pb-Pb collisions at nucleon-nucleon center-of-mass energies $\sqrt{s_{NN}}$ = 14 TeV, 8.8 TeV, and 5.5 TeV respectively. Such a measurement has no substantial backgrounds in Pb-Pb collisions where one expects about 70 signal events per run, after typical detector acceptance and reconstruction efficiency selections.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑