On the branching ratio of the "second class" tau --> eta' pi nu_tau decay

Abstract

We present an assessment of the standard model expectations for the branching ratio of the isotopic spin and G-parity violating decay tau --> eta' pi nu_tau. The estimate is based on a vector and scalar meson dominance parametrization of the relevant form factors, that explicitly accounts for pi^0-eta-eta' mixing. The numerical results obtained in this framework indicate a branching ratio one order of magnitude (or more) below the current experimental limit, and suggest the possibility of evidencing some novel interaction in high statistics studies of this decay.

8 pages

References in corpus (5)

• A global fit to determine the pseudoscalar mixing angle and the gluonium content of the eta' meson
• Low-lying even parity meson resonances and spin-flavor symmetry
• Estimate of the branching fraction ${\tau }^{-}\to \eta {\pi }^{-}{\nu }_{\tau }$, the $a_0^{-}(980)$, and non-standard weak interactions
• Light scalar mesons in QCD
• Estimate of the Branching Fraction of tau --> pi eta' nu_tau

Cited by in corpus (8)

• Precision tests of fundamental physics with $\eta$ and ${\eta }^{\prime }$ mesons
• Effective-field theory analysis of the ${\tau }^{-}\to {\eta }^{(\prime )}{\pi }^{-}{\nu }_{\tau }$ decays
• ${\tau }^{-}\to {\eta }^{(\prime )}{\pi }^{-}{\nu }_{\tau }\gamma$ decays as backgrounds in the search for second class currents
• G-parity breaking in ${\tau }^{-}\to {\eta }^{(\prime )}{\pi }^{-}{\nu }_{\tau }$ decays induced by the ${\eta }^{(\prime )}\gamma \gamma$ form factor
• ${\tau }^{-}\to {\pi }^{-}\eta {\nu }_{\tau }$ decay induced by QED one-loop effects
• The second-class current decays $\tau \to \pi \eta ({\eta }^{\prime }){\nu }_{\tau }$ in the NJL model including the interaction of mesons in the final state
• Towards the (Mexican) discovery of second class currents at Belle-II
• The decay ${\eta }^{\prime }\to \pi \rho$ in the chiral NJL model