A "known" CP asymmetry in $\tau$ decays

Abstract : We point out that dynamics known from the observed CP violation in $K_L\to \pi^{\mp}l^{\pm}\nu$ generate a CP asymmetry of $3.3\cdot 10^{-3}$ in $\tau^{\pm} \to \nu K_L\pi^{\pm}$. CPT invariance requires the same asymmetry in the more approachable transitions $\tau^{\pm} \to \nu K_S\pi^{\pm}$. While little new can be learnt from this fact, it has to be accounted for, since CP asymmetries in $\tau \to \nu K\pi$ channels are prime candidates for revealing the intervention of New Physics. This `known' CP asymmetry provides a very useful calibration point in such searches. It also provides a test of CPT symmetry (as well as the $\Delta Q = \Delta S$ selection rule).
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Journal articles
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http://hal.in2p3.fr/in2p3-00025267
Contributor : Sabine Starita <>
Submitted on : Wednesday, December 21, 2005 - 5:15:38 PM
Last modification on : Wednesday, September 16, 2020 - 4:23:19 PM

Citation

I.I. Bigi, A.I. Sanda. A "known" CP asymmetry in $\tau$ decays. Nuclear Physics B, Elsevier, 2005, 625, pp.47-52. ⟨10.1016/j.physletb.2005.08.033⟩. ⟨in2p3-00025267⟩

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