Unified study of two-meson and axion-meson production from semileptonic tau decays within resonance chiral framework

Le résumé fourni par la source

We carry out the joint study of the semileptonic tau decays into the two-meson and axion-meson channels, viz. $τ^-\to (P_1P_2)^-ν_τ$ and $τ^-\to π^-(K^-) aν_τ$ within the framework of resonance chiral theory by including the model-independent axion-gluon-gluon interaction. By utilizing the $π^0$-$η$-$η'$-axion mixing matrix elements from recent studies, we calculate the pertinent two-pseudoscalar boson form factors. To simultaneously fit the experimental spectra measured in the Cabibbo allowed $τ^-\to π^-π^0ν_τ$ process and also the Cabibbo suppressed $τ^-\to(K_Sπ^-, K^-η)ν_τ$ ones, we determine all the relevant hadron resonance parameters. Then we give predictions to the spectra and branching ratios for various channels, such as $τ^-\to(π^-η,π^-η',K^-η',π^-a,K^-a)ν_τ$. We also calculate the forward-backward asymmetries for all the aforementioned channels. The interplay between the scalar and vector form factors for different observables is analyzed in detail. Our theoretical predictions supply useful guidance to the future tau experiments, such as those at Belle-II, Super Tau-Charm Facility and Tera-Z factory of Circular Electron-Positron Collider.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.