arXiv 1707.030372017-07hep-ph

PDMATHAAB形状因子引起的$τ^- \to η^{(\prime)} π^- ν_τ$衰变中的G宇称破缺

G-parity breaking in $τ^- \to η^{(\prime)} π^- ν_τ$ decays induced by the $η^{(\prime)}γγ$ form factor

G. Hernández-Tomé, G. López Castro, P. Roig

备注：: 6 pages, 1 figure, Approved for publication in Physical Review D, Appendix with Lengthy expressions can be found in v1
发表信息：: Phys. Rev. D 96, 053003 (2017)
DOI：: 10.1103/PhysRevD.96.053003

摘要：

G宇称的破缺或新的弱（第二类）电流可能是$τ^- \to η^{(\prime)} π^- ν_τ$衰变的原因。即将在Belle II实验中进行的$τ$轻子性质的测量将首次能够测量这种衰变通道。从测量的速率中分离出新的物理贡献需要仔细评估G宇称破缺的贡献。在这里，我们评估的单圈贡献的$τ^- \to η^{(\prime)} π^- ν_τ$衰变引起的两个虚光子的发射和它后来转换成一个$η^{(\prime)}$介子。正如预期的那样，这种贡献非常小，可能仅与在$10^{-4}$水平上对$τ^- \to η^{(\prime)} π^- ν_τ$的衰变率有贡献的新物理搜索相关。

英文摘要：

Breaking of G-parity or new weak (second class) currents can be responsible for $τ^- \to η^{(\prime)} π^- ν_τ$ decays. Forthcoming measurements of $τ$ lepton properties at the Belle II experiment will be able to measure this decay channel for the first time. Isolating new physics contributions from the measured rates will require a careful evaluation of G-parity breaking contributions. Here we evaluate the one-loop contribution to $τ^- \to η^{(\prime)} π^- ν_τ$ decays induced by the emission of two virtual photons and its later conversion into an $η^{(\prime)}$ meson. As expected, this contribution is very small and may be relevant only for new physics searches contributing at the $10^{-4}$ level to the decay rate of $τ^- \to η^{(\prime)} π^- ν_τ$ .

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