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arXiv 2103.03963hep-ph
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互斥过程中的普适轻子普适性破坏

Universal lepton universality violation in exclusive processes

Lin Dai, Chul Kim, Adam K. Leibovich

摘要:

在涉及轻子的高能排他过程中,QED修正可能对轻子质量和软光子能量切割等红外尺度敏感,从而导致需要在$α$中对所有阶数进行量子化的大量子数。当考虑两种不同轻子味之间互斥过程的比率时,比率$R$可以用解耦轻子扇区中的因式分解函数来表示。虽然一些函数项被取消,但由于轻子质量差和能量削减,仍然存在大的动量。这个因式分解过程可以普遍地应用于$Z\to l^+l^-$和$B^-\to l^-\barν_l$等互斥过程,在这些过程中,比率的图解结果与轻子普适性的朴素期望有很大的偏差。

英文摘要:

In high energy exclusive processes involving leptons, QED corrections can be sensitive to infrared scales like the lepton mass and the soft photon energy cut, resulting in large logarithms that need to be resummed to all order in $α$. When considering the ratio of the exclusive processes between two different lepton flavors, the ratio $R$ can be expressed in terms of factorized functions in the decoupled leptonic sectors. While some of the functional terms cancel, there remain the large logarithms due to the lepton mass difference and the energy cut. This factorization process can be universally applied to the exclusive processes such as $Z\to l^+l^-$ and $B^-\to l^-\barν_l$, where the resummed result in the ratio gives significant deviations from the naive expectation from lepton universality.

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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