Exclusive hadronic tau decays as probes of non-SM interactions

We perform a global analysis of exclusive hadronic tau decays
into one and two mesons using the low-energy limit of the Standard Model
Effective Field Theory up to dimension six, assuming left-handed
neutrinos. A controlled theoretical input on the Standard Model hadronic
form factors, based on chiral symmetry, dispersion relations, data and
asymptotic QCD properties, has allowed us to set bounds on the New Physics
effective couplings using the present experimental data. Our results
highlight the importance of semileptonic Tau decays in complementing
the traditional low-energy probes, such as nuclear beta decays and
semileptonic pion and kaon decays, and also in complementing the
high-energy measurements at LHC scales. Therefore Tau physics is more than
a clean low energy QCD laboratory (for which is very well known). It can
also be used as a probe of NP. This makes yet another reason for
considering hadronic Tau decays as golden modes at Belle-II.

Evento presencial transmitido por Zoom en la siguiente liga:
https://cuaieed-unam.zoom.us/j/84528020176?pwd=ODRubmFxN2V1UjAyYUJvTGRFbGxaQT09