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## Search for CP Violation in the Decay tau- -> pi- K^0_S (>= 0 pi0) nu_tau

### Abstract

We report a search for CP violation in the decay \tau- -> \pi - \K^0_S (>= 0 \pi 0) \nu_\tau\ using a dataset of 437 million \tau\ lepton pairs, corresponding to an integrated luminosity of 476 fb^{-1}, collected with the BABAR detector at the PEP-II asymmetric energy e+e- storage rings. The CP-violating decay-rate asymmetry is determined to be (-0.45 +/- 0.24 +/- 0.11)%, approximately three standard deviations from the Standard Model prediction of (0.33 +/- 0.01)%

Topics: CP violation, tau decay
Year: 2012
DOI identifier: 10.1103/PhysRevD.85.031102
OAI identifier: oai:iris.unife.it:11392/1666283