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arXiv 2403.06336hep-ph
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在LHC质子碰撞中通过光子融合测量τ轻子g-2的策略

Strategy to measure tau $g-2$ via photon fusion in LHC proton collisions

Lydia Beresford, Savannah Clawson, Jesse Liu

AI总结:

本研究针对LHC质子碰撞中$γγ\ oττ$过程难以观测的问题,提出结合电子-缪子信号与顶点隔离的新策略测量τ轻子反常磁矩,在300 fb⁻¹亮度下将95%置信水平灵敏度提升四倍,为探索新物理提供关键途径。

摘要:

通过光子融合产生过程($γγ\ oττ$)测量τ轻子($τ$)的反常磁矩$a_τ=(g_τ-2)/2$,是对标准模型基础原理的检验。然而,尽管相比现有探测手段,LHC质子碰撞(pp)的更高质量可达性带来了更强的新物理灵敏度,但$γγ\ oττ$过程仍难以在其中被观测到。我们提出一种测量$\text{pp} \ o \ ext{p}(γγ\ oττ)\ ext{p}$过程的新策略,引入此前被忽视的电子-缪子信号,并采用顶点隔离方法提取信号。利用偶极矩有效场论,我们假设积分亮度为300 fb$^{-1}$、系统误差为5%时,估算得到95%置信水平下的灵敏度为$-0.0092 < a_τ< 0.011$。这一结果比现有约束提升了四倍,为揭示τ轻子偶极子中蕴含的新物理开辟了关键路径。

英文摘要:

Measuring the tau-lepton ($τ$) anomalous magnetic moment $a_τ= (g_τ-2)/2$ in photon fusion production ($γγ\toττ$) tests foundational Standard Model principles. However, $γγ\toττ$ eludes observation in LHC proton collisions (pp) despite enhanced new physics sensitivity from higher-mass reach than existing probes. We propose a novel strategy to measure $\text{pp} \to \text{p}(γγ\toττ)\text{p}$ by introducing the overlooked electron-muon signature with vertex isolation for signal extraction. Applying the effective field theory of dipole moments, we estimate 95% CL sensitivity of $-0.0092 < a_τ< 0.011$ assuming 300 fb$^{-1}$ luminosity and 5% systematics. This fourfold improvement beyond existing constraints opens a crucial path to unveiling new physics imprinted in tau-lepton dipoles.

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。

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