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

Abstract

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 $\Delta B=\Delta L=2$ decays involving $\tau$ leptons. For the two-nucleon disappearance channel $np\to {\tau }^{+}{\overline{\nu }}_{\tau }$ the estimated limit for the partial mean life is $\frac{\tau }{Br}>1\times 10^{30}$ 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 $\tau$ lepton final states.

arXiv comment7 pages, 0 figures

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• Simplified models with baryon number violation but no proton decay
• Search for the Invisible Decay of Neutrons with KamLAND
• Search for Nucleon Decay with Final States l+ eta, nubar eta, and nubar pi+,0 Using Soudan 2

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• Baryon-Number-Violating Nucleon and Dinucleon Decays in a Model with Large Extra Dimensions
• Improved Upper Limits on Baryon-Number Violating Dinucleon Decays to Dileptons
• Nucleon and dinucleon decays to leptonic final states in a left-right symmetric model with large extra dimensions