Search for Lepton Flavor and Lepton Number Violating tau Decays into a Lepton and Two Charged Mesons

Details Search for Lepton Flavor and Lepton Number Violating tau Decays into a Lepton and Two Charged Mesons Search for Lepton Flavor and Lepton Number Violating tau Decays into a Lepton and Two Charged Mesons

2009-08-21

arxiv.org/abs/0908.3156v1

Phys.Lett.B682:355-362,2010

Physics

High Energy Physics

High Energy Physics - Experiment

15 page, 7 figures, submitted to Phys. Lett. B

Scientific paper

10.1016/j.physletb.2009.11.061

We search for lepton flavor and lepton number violating tau decays into a lepton (ell = electron or muon) and two charged mesons (h,h' = pi^\pm or K^\pm), tau- -> ell-h+h'- and tau- -> ell+h-h'-, using 671 fb^{-1} of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain 90% C.L. upper limits on the branching fractions in the range (4.4-8.8)x10^{-8} for tau -> ehh', and (3.3-16)x10^{-8} for tau -> muhh' processes. These results improve upon previously published upper limits by factors between 1.6 to 8.8.

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