Observation ofγγ→ττin proton-proton collisions and limits on the anomalous electromagnetic moments of the τ lepton.

Reports on progress in physics. Physical Society (Great Britain) Pub Date : 2024-09-02 DOI:10.1088/1361-6633/ad6fcb

The Cms Collaboration

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Abstract

The production of a pair of τ leptons via photon-photon fusion,γγ→ττ, is observed for the first time in proton-proton collisions, with a significance of 5.3 standard deviations. This observation is based on a data set recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb^-1. Events with a pair of τ leptons produced via photon-photon fusion are selected by requiring them to be back-to-back in the azimuthal direction and to have a minimum number of charged hadrons associated with their production vertex. The τ leptons are reconstructed in their leptonic and hadronic decay modes. The measured fiducial cross section ofγγ→ττisσobsfid=12.4-3.1+3.8fb. Constraints are set on the contributions to the anomalous magnetic moment (aτ) and electric dipole moments (dτ) of the τ lepton originating from potential effects of new physics on theγττvertex:aτ=0.0009-0.0031+0.0032and|dτ|<2.9×10-17ecm(95% confidence level), consistent with the standard model.

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质子-质子碰撞中γγ→ττ的观测以及对τ轻子反常电磁矩的限制。

在质子-质子对撞中首次观测到通过光子-光子融合产生一对$\tau$轻子，即$\gamma\gamma\to\tau\tau$，其显著性为5.3个标准偏差。这一观测基于大型强子对撞机上的CMS探测器在13 TeV的质心能量下记录的一组数据，对应的综合光度为138 fb${^-1}。通过光子-光子聚变产生的一对$tau轻子的事件是通过要求它们在方位角方向上背靠背，并且与它们的产生顶点相关的带电强子的最小数量来选择的。对 $\tau$ 轻子的轻子衰变和强子衰变模式进行了重构。测量到的$\gamma\gamma\to\tau\tau$的基准截面是$\sigma^\text{fid}_\text{obs}$ = 12.4$^{+3.8}_{-3.1}$ fb。新物理学对$\gamma\tau\tau＄顶点的潜在影响对$\tau＄轻子的反常磁矩（\$a_\tau＄）和电偶极矩（$d_\tau＄）的贡献设定了约束：$a_\tau＄ = 0.0009$_{-0.0031}^{+0.0032}$ and $\lvert d_\tau \rvert$ $\lt$ 2.9 $\times$ 10$^{-17}e$cm（95%置信度），与标准模型一致。

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Reports on progress in physics. Physical Society (Great Britain)

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