Search for lepton-flavor-violating $\tau \to \ell V^0$ decays at Belle

Abstract

We have searched for neutrinoless $\tau$ lepton decays into $\ell$ and $V^0$, where $\ell$ stands for an electron or muon, and $V^0$ for a vector meson ($\varphi$, $\omega$, $K^{\ast 0}$, ${\bar{K}}^{\ast 0}$ or ${\rho }^0$), using 543 fb${}^{-1}$ of data collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. No excess of signal events over the expected background has been observed, and we set upper limits on the branching fractions in the range $(5.9-18)\times 10^{-8}$ at the 90% confidence level. These upper limits include the first results for the $\ell \omega$ mode as well as new limits that are significantly more restrictive than our previous results for the $\ell \varphi$, $\ell K^{\ast 0}$, $\ell {\bar{K}}^{\ast 0}$ and $\ell {\rho }^0$ modes.

7 pages, 16 figures

References in corpus (5)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Observation of Y(3940) -> J/psi omega in B -> J/psi omega K at BABAR
• Lepton flavor violation in $\tau$ decays
• Search for Lepton Flavor Violating Decays τ^\pm \to l^\pmω(l = e, μ)
• Search for neutrinoless decays tau -> lhh and tau -> lV0

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• Leptoquark on $P\to {\ell }^{+}\nu$, FCNC and LFV
• Unparticle-Induced Lepton Flavor Violating Decays τ^- ->l^- (V^0, ~P^0)
• Lepton-flavor-violating semileptonic $\tau$ decay and $K\to \pi \nu \bar{\nu }$
• Improved limits on lepton flavor violating tau decays to l phi, l rho, l K* and l K*bar
• Review of Applications of YFS-Style Resummation in Quantum Field Theory via Monte Carlo Methods