Two Nucleon (B-L)-Conserving Reactions Involving Tau Leptons

Tau lepton emission in two-nucleon disappearance reactions from within nuclei which conserve baryon number minus lepton number (B-L) is considered. It is shown that some existing limits on proton decay channels and two-nucleon disappearance reactions resulting in electrons and muons can be applied to $ΔB=ΔL=2$ decays involving $τ$ leptons. For the two-nucleon disappearance channel $np\toτ^+ \overlineν_τ$ the estimated limit for the partial mean life is $\fracτ{Br}>1\times10^{30}$ yrs based on results from the IMB3 experiment. Re-analysis of existing data and future experiments could result in higher sensitivity for two-nucleon disappearance modes involving $τ$ lepton final states.

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