Search for neutrinoless τ decays
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- ARGUS Collaboration, Albrecht, H., Ehrlichmann, H. et al. Z. Phys. C - Particles and Fields (1992) 55: 179. doi:10.1007/BF01482581
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Upper limits on branching ratios for six neutrinoless leptonic, 16 semileptonic, two radiative-leptonic, two radiative-hadronic and three purely hadronic τ decays have been determined. The results improve over previously published ones by about a factor of two. For the first time the lepton and baryon number violating decays\(\tau ^ - \to \bar p\gamma ,\tau ^ - \to \bar p\pi ^0 \) and\(\tau ^ - \to \bar p\eta \) have been investigated. The 90% confidence level (CL) limits for the corresponding branching ratios amount to 2.9×10−4, 6.6×10−4 and 1.3×10−3 respectively.