Search for neutrinoless τ decays

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Abstract

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.

Supported by the German Bundesministerium für Forschung und Technologie, under contract number 054DO 51P
Supported by the German Bundesministerium für Forschung und Technologie, under contract number 054ER 12P
Supported by the German Bundesministerium für Forschung and Technologie, under contract number 055 HD 21P
Supported in part by the Walter C. Sumner Foundation
Supported by the Natural Sciences and Engineering Research Council, Canada
Supported by the German Bundesministerium für Forschung und Technologie, under contract number 054KA17P
Supported by the Department of Science and Technology of the Republic of Slovenia and the Internationales Büro KfA, Jülich
Supported by the Swedish Research Council