CP violation in hadronic tau decays
Abstract
We consider CP-violating effects in tau -> 3 pi nu_ tau and 4 pi nu_ tau (Delta S = 0), and tau -> K pi pi nu_tau (Delta S = 1), assuming that the usual Standard Model amplitudes for these processes interfere with analogous amplitudes mediated by a charged Higgs boson. In the Delta S = 0 case we focus specifically on the intermediate resonant processes tau -> V pi nu_tau (with V=omega, rho, and a_1), and consider three CP-odd observables -- the partial rate asymmetry, a polarization-dependent asymmetry and a triple-product asymmetry. In the Delta S = 1 case we examine the partial rate asymmetry, two "modified" rate asymmetries, and a triple-product asymmetry. The partial rate asymmetry is expected to be small for both the Delta S = 0 and Delta S = 1 cases. Evaluation of the other asymmetries indicates that they could potentially be measurable.
Cite
@article{arxiv.1212.6921,
title = {CP violation in hadronic tau decays},
author = {Ken Kiers},
journal= {arXiv preprint arXiv:1212.6921},
year = {2013}
}
Comments
4 pages, 1 figure; this article draws heavily from arXiv:0808.1707, arXiv:hep-ph/0610162; to appear in the proceedings of the 12th International Workshop on Tau Lepton Physics, Nagoya, Japan, 17-21 September, 2012