Search for the lepton number violating process ${\Xi }^{-}\to {\Sigma }^{+}{e}^{-}{e}^{-}+c.c.$

Abstract

We present a search for the lepton number violating decay ${\Xi }^{-}\to {\Sigma }^{+}{e}^{-}{e}^{-}+c.c.$ with $(10087\pm 44)\times 10^6$ $J/\psi$ events collected by the BESIII detector at the BEPCII collider. Employing a blind analysis strategy, no significant signal is observed above the expected background yield. The upper limit on the branching fraction is determined to be $\mathrm{Br}({\Xi }^{-}\to {\Sigma }^{+}{e}^{-}{e}^{-}+c.c.)<2.0\times 10^{-5}$ at the $90\%$ confidence level.

References in corpus (19)

• Design and Construction of the BESIII Detector
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• Future Physics Programme of BESIII
• Neutrino-less Double Beta Decay and Particle Physics
• Double Beta Decay
• Method for detector description transformation to Unity and application in BESIII
• Number of $J/\psi$ events at BESIII
• Weak phases and CP-symmetry tests in sequential decays of entangled double-strange baryons
• Review of searches for vector-like quarks, vector-like leptons, and heavy neutral leptons in proton-proton collisions at $\sqrt{s}$ = 13 TeV at the CMS experiment
• Combined estimation for multi-measurements of branching ratio
• Probing heavy Majorana neutrinos and the Weinberg operator through vector boson fusion processes in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Double beta decay of sigma^- hyperons
• Search for Majorana neutrinos in same-sign $WW$ scattering events from $pp$ collisions at $\sqrt{s}=13$ TeV
• Search for the Lepton-Number-Violating Decay ${\Xi }^{-}\to p{\mu }^{-}{\mu }^{-}$
• $\Delta L=2$ hyperon semileptonic decays
• Matrix elements of four-quark operators and ΔL=2 hyperon decays
• $\Delta$L=2 hyperon decays induced by Majorana neutrinos and doubly-charged scalars
• Search for heavy right-handed Majorana neutrinos in the decay of top quarks produced in proton$-$proton collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Resonant Majorana neutrino effects in $\Delta$L=2 four-body hyperon decays