Bordone Marzia, Cornella Claudia, Isidori Gino, König Matthias
Theoretische Physik 1, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Walter-Flex-Straße 3, 57068 Siegen, Germany.
Dipartimento di Fisica, Università di Torino & INFN, Sezione di Torino, 10125 Turin, Italy.
Eur Phys J C Part Fields. 2021;81(9):850. doi: 10.1140/epjc/s10052-021-09618-3. Epub 2021 Sep 25.
We discuss the possibility of performing precise tests of universality in decays. We show that in wide regions of the dilepton invariant mass spectrum the ratio between muonic and electronic decay widths can be predicted with high accuracy, both within and beyond the Standard Model. We present numerical expressions which can be used to extract precise information on short-distance dynamics if a deviation from universality is observed in the data.
我们讨论了在衰变中进行普适性精确检验的可能性。我们表明,在双轻子不变质量谱的广泛区域内,无论是在标准模型之内还是之外,μ子衰变宽度与电子衰变宽度之比都能被高精度地预测。我们给出了数值表达式,如果在数据中观察到与普适性的偏差,这些表达式可用于提取关于短程动力学的精确信息。