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

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

2011-05-18

arxiv.org/abs/1105.3595v1

Phys.Rev.D84:017302,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages

Scientific paper

10.1103/PhysRevD.84.017302

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.

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