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

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

2008-06-24

arxiv.org/abs/0806.3922v2

Phys.Rev.D78:033006,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages

Scientific paper

10.1103/PhysRevD.78.033006

We consider the ``second-class current'' decay $\tau^-\to\pi^-\eta\nu_\tau$ 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 $\rho\eta\pi$ coupling inferred from the rates and Dalitz-plot distributions of $\eta\to 3\pi$ 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 $\tau^-\to\pi^-\eta\nu_\tau$ decay provides information on this question, which nicely complements that from precision $\beta$ decay experiments. % In summary, we discuss the possible implications of putative values of the branching fraction ${\cal B}(\tau^-\to\pi^-\eta\nu_\tau)$. 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.

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