论文标题
用2.2 nb $^{ - 1} $逐光散射的测量和搜索类似于轴的颗粒，带有Atlas检测器的Pb+Pb数据
Measurement of light-by-light scattering and search for axion-like particles with 2.2 nb$^{-1}$ of Pb+Pb data with the ATLAS detector
论文作者
论文摘要
本文介绍了基于LHC运行2期间Atlas实验记录的PB+PB碰撞数据的逐光散射的测量。该研究使用$ 2.2 $ nb $^{ - 1} $在2015年和2018年收集的$ \ sqrt {s_ \ mathrm {nn}} = 5.02 $ tev。在独家产生两个光子的事件中选择了逐光散射候选者，每个光子都带有横向能$ e _ {\ mathrm {t}}}^γ> 2.5 $ GEV，pseudorapity $ |η_γγ| <2.37 $，双hoton不变质量$ m_ {γγ}> 5 $ gev，并且带有小的双hoton横向动量和二孔丙型链球菌。测量综合和差异基准横截面并将其与理论预测进行比较。双键量不变质量分布用于对轴突样颗粒的产生设置限制。该结果为6-100 GEV范围内的质量产生了迄今为止的最严格限制。在该质量间隔中，在95％CL处排除了高于2至70 nb的横截面。
This paper describes a measurement of light-by-light scattering based on Pb+Pb collision data recorded by the ATLAS experiment during Run 2 of the LHC. The study uses $2.2$ nb$^{-1}$ of integrated luminosity collected in 2015 and 2018 at $\sqrt{s_\mathrm{NN}}=5.02$ TeV. Light-by-light scattering candidates are selected in events with two photons produced exclusively, each with transverse energy $E_{\mathrm{T}}^γ > 2.5$ GeV, pseudorapidity $|η_γ| < 2.37$, diphoton invariant mass $m_{γγ} > 5$ GeV, and with small diphoton transverse momentum and diphoton acoplanarity. The integrated and differential fiducial cross sections are measured and compared with theoretical predictions. The diphoton invariant mass distribution is used to set limits on the production of axion-like particles. This result provides the most stringent limits to date on axion-like particle production for masses in the range 6-100 GeV. Cross sections above 2 to 70 nb are excluded at the 95% CL in that mass interval.
