Search for lepton-flavor-violating $\tau$ decays into a lepton and a vector meson using the full Belle data sample

Abstract

Charged-lepton-flavor-violation is predicted in several new physics scenarios. We update the analysis of $\tau$ lepton decays into a light charged lepton ($\ell$ = $e^{\pm }$ or ${\mu }^{\pm }$) and a vector meson ($V^0$ = ${\rho }^0$, $\varphi$, $\omega$, $K^{\ast 0}$, or $\overline{K}{}^{\ast 0}$) using 980 fb${}^{-1}$ of data collected with the Belle detector at the KEKB collider. No significant excess of such signal events is observed, and thus 90% credibility level upper limits are set on the $\tau \to \ell V^0$ branching fractions in the range of (1.7--$4.3)\times 10^{-8}$. These limits are improved by 30% on average from the previous results.

19 pages, 5 figures; added one sentence in Acknowledgments; added a systematic uncertainty about the number of background estimation, and corrected some sentences

References in corpus (5)

• Tau and muon pair production cross-sections in electron-positron annihilations at sqrt{s} = 10.58 GeV
• The model-discriminating power of lepton flavor violating tau decays
• Unparticle-Induced Lepton Flavor Violating Decays τ^- ->l^- (V^0, ~P^0)
• The fate of $V_1$ vector leptoquarks: the impact of future flavour data
• Lepton Flavour Violation in Hadron Decays of the Tau Lepton within the Littlest Higgs Model with T-parity

Cited by in corpus (4)

• Flavor physics in SU(5) GUT with scalar fields in the 45 representation
• Explaining the $B_{d(s)}\to K^{(\ast )}{\bar{K}}^{(\ast )}$ puzzle via chiral-flip in $R$-parity violating MSSM with seesaw mechanism
• Constraining lepton flavor violating SMEFT $2q2\ell$ operators from low-energy cLFV processes
• Lepton flavor violation with tau leptons