CP Violation in Hadronic tau Decays
Abstract
We re-examine CP violation in the Delta S = 0 decays tau -> N pi nutau (N=2,3,4). We assume that the new physics (NP) is a charged Higgs. We show that there is no NP contribution to tau -> pi pi nutau, which means that no CP violation is expected in this decay. On the other hand, NP can contribute to tau -> N pi nutau (N=3,4). These are dominated by the intermediate resonant decays tau -> omega pi nutau, tau -> rho pi nutau and tau -> a1 pi nutau. We show that the only sizeable CP-violating effects which are possible are in tau -> a1 pi nutau -> 4 pi nutau (polarization-dependent rate asymmetry) and tau -> omega pi nutau (triple-product asymmetry).
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