Branching fraction of tau^- --> pi^- K0S K0S (pi0) nu_tau decays

Abstract : We present a study of tau- --> pi- K0S K0S (pi0) nu and tau- --> K- K0S K0S (pi0) nu decays using a dataset of 430 million tau lepton pairs, corresponding to an integrated luminosity of 468 fb-1, collected with the BaBar detector at the PEP-II asymmetric energy e+e- storage rings. We measure branching fractions of (2.31 +/- 0.04 +/- 0.08)x10^{-4} and (1.60 +/- 0.20 +/- 0.22)x10^{-5} for the tau- --> pi- K0S K0S nu and tau- --> pi- K0S K0S pi0 nu decays, respectively. We find no evidence for tau- --> K- K0S K0S nu and tau- --> K- K0S K0S pi0 nu decays and place upper limits on the branching fractions of 6.3 x 10^{-7) and 4.0 x 10^{-7} at the 90% confidence level.
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Submitted on : Friday, August 3, 2012 - 2:48:22 PM
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J.P. Lees, V. Poireau, V. Tisserand, D. Bernard, M. Verderi, et al.. Branching fraction of tau^- --> pi^- K0S K0S (pi0) nu_tau decays. Physical Review D, American Physical Society, 2012, 86, pp.092013. ⟨10.1103/PhysRevD.86.092013⟩. ⟨in2p3-00722724⟩

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