Search for lepton-flavor and lepton-number-violating τ→ℓhh′ decay modes

2012/06/30 by Y. Miyazaki, I. Adachi, K. Hayasaka +141 · 3 citations
Computer Science · Physics and Astronomy · #Collider #Computational Physics and Python Applications #Electron #Electron–positron annihilation #Hadron #KEKB #Lepton #Lepton number #Meson #Muon #Neutrino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1016/j.physletb.2013.01.032

14 pages, 5 figures, submitted to Phys. Lett. B

arxiv created 2013/01/22 · openalex publication_date 2013/01/23 · arxiv updated 2015/06/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We search for lepton-flavor and lepton-number-violating τ decays into a lepton ( ℓ = electron or muon) and two charged mesons ( h , h ′ = π ± or K ± ) using 854 fb − 1 of data collected with the Belle detector at the KEKB asymmetric-energy e + e − collider. We obtain 90% confidence level upper limits on the τ → ℓ h h ′ branching fractions in the range ( 2.0 – 8.4 ) × 10 − 8 . These results improve upon our previously published upper limits by factors of about 1.8 on average.

Citations

• Electron identification in Belle
• τ−μflavor violation as a probe of the scale of new physics
• The precision Monte Carlo event generator for two-fermion final states in collisions
• Leptoquark on P→ℓ+ν, FCNC and LFV

Cited by

• Testing the nature of neutrinos from four-body τ decays
• Phenomenology of the Zee model for Dirac neutrinos and general neutrino interactions
• Combining experimental and cosmological constraints on heavy neutrinos