Estimate of the branching fraction $τ^- \to ηπ^-ν_τ$, the $a_0^-(980)$, and non-standard weak interactions

Abstract

We consider the ``second-class current'' decay $τ^-\toπ^-ην_τ$ from several points of view. We first focus on the decay rate as expected within standard weak interaction and QCD due to isospin violation. The decay contributions divide into $P$- and $S$-wave parts. The former can be reliably estimated using the $ρηπ$ coupling inferred from the rates and Dalitz-plot distributions of $η\to 3π$ decays. The somewhat larger $S$-wave part, which was previously computed using chiral perturbation theory, is estimated from a simple $\bar qq$ model. Both estimates of the $S$-wave part depend on whether the $a_0(980)$ scalar particle is a $\bar qq$ or some other (4-quark) state. Finally, we discuss genuinely new, non-$V-A$ scalar weak interactions. The $τ^-\toπ^-ην_τ$ decay provides information on this question, which nicely complements that from precision $β$ decay experiments. % In summary, we discuss the possible implications of putative values of the branching fraction ${\cal B}(τ^-\toπ^-ην_τ)$. In the case of larger values, in particular of the $S$-wave part, not only will detection of the decay be more likely and more reliable, its implications will be more far-reaching and interesting.