Speaker
Description
In case there are tensor interactions beyond the SM in the low-energy EFT Lagrangian, their interference with the SM V-A currents yields a contribution for tau decays into three or more mesons [as we noted in Phys.Rev.D 106 (2022) 9, 096016] that cannot be included in the famous structure functions introduced by Kühn and Mirkes (KM) in their seminal 1992 paper [Z.Phys.C 56 (1992) 661-672]. We perform this generalization here, highlighting again the importance of measuring the (generalized) KM spectral functions (instead of e. g. doing a partial-wave analysis), as being model-independent and capturing the most information from the data. This can be particularly relevant for CPV studies with at least three mesons in the final state of the tau decay.