Upper limits on the branching ratios tau --> mu gamma and tau --> e gamma

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1995) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 359, n° 3-4, p. 411-421 (1995)

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The DELPHI collaboration has searched for lepton flavour violating decays τ → μγ and τ → μgg using a data sample of about 70 pb−1 of integrated luminosity corresponding to 81 000 produced τ+τ− events. No candidates were found for either of the two modes. This yields branching ratio upper limits of B(τ → eγ) < 1.1 × 10−4 and B(τ → μγ) < 6.2 × 10−5 at 90% confidence level.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1995). Upper limits on the branching ratios tau --> mu gamma and tau --> e gamma. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 359(3-4), 411-421. https://doi.org/10.1016/0370-2693(95)01045-R (Original work published 1995)