Double beta decay of sigma^- hyperons

Abstract

We compute the strangeness-conserving double beta decay of ${\Sigma }^{-}$ hyperons, which is the only hadronic system that can undergo such decays. We consider both, the lepton number conserving %$Σ^-\go Σ^++2e^-+2 \barν$ $Σ^-\go Σ^+e^-e^-\barν\barν$ ($\beta {\beta }_{{\Sigma }_{2\nu }}$) and the lepton number violating $Σ^-\go Σ^+e^-e^-$ ($\beta {\beta }_{{\Sigma }_{0\nu }}$) modes. The branching ratios of these $\beta \beta$ decays are suppressed at the level of $10^{-30}$ considering a light neutrino scenario in the case of the $\beta {\beta }_{{\Sigma }_{0\nu }}$ channel. The dynamical origin of such low rates and their possible enhancements are briefly discussed. Given its simplicity those decays can be used also for the purposes of illustrating the main features of double beta decays.

14 pages in espcrc1 latex style. 2 eps figures. Minor changes added

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Cited by in corpus (21)

• The Search for Heavy Majorana Neutrinos
• Neutrino-less Double Beta Decay and Particle Physics
• Upper Bounds on Lepton-number Violating Processes
• Prospects for rare and forbidden hyperon decays at BESIII
• Effects of heavy Majorana neutrinos on lepton flavor violating processes
• Search for the Lepton-Number-Violating Decay ${\Xi }^{-}\to p{\mu }^{-}{\mu }^{-}$
• Exploring GeV-scale Majorana neutrinos in lepton-number-violating ${\Lambda }_b^0$ baryon decays
• Top quark as a probe of heavy Majorana neutrino at the LHC and future collider
• $\Delta L=2$ hyperon semileptonic decays
• Matrix elements of four-quark operators and ΔL=2 hyperon decays
• Searching for lepton number violating $\Lambda$ baryon decays mediated by GeV-scale Majorana neutrino with LHCb
• Search for the lepton number violating decay ${\Sigma }^{-}\to p{e}^{-}{e}^{-}$ and the rare inclusive decay ${\Sigma }^{-}\to {\Sigma }^{+}X$
• Probing a new decay of vector-like top partner mediated by heavy Majorana neutrino via single production
• $\Delta$L=2 hyperon decays induced by Majorana neutrinos and doubly-charged scalars
• CP violation with GeV-scale Majorana neutrino in ${\Lambda }_b\to ({\Lambda }_c^{+},p^{+}){\pi }^{+}{\mu }^{-}{\mu }^{-}$ decays
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• Dirac-Majorana neutrinos distinction in four-body decays
• Probing vector-like top partner from same-sign dilepton events at the LHC
• CP violation in $B_s$ decays mediated by two nearly-degenerate Majorana neutrinos
• Search for the lepton number violating process ${\Xi }^{-}\to {\Sigma }^{+}{e}^{-}{e}^{-}+c.c.$