A missing-mass search in semileptonic B decays at Belle II could constrain or discover GeV-scale sterile neutrinos, with sensitivity comparable to or better than upgraded LHCb for masses below 2 GeV.
Neutrinoless Double Beta Decay: Low Left-Right Symmetry Scale?
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abstract
Experiments in progress may confirm a nonzero neutrinoless double beta decay rate in conflict with the cosmological upper limit on neutrino masses and thus require new physics beyond the Standard Model. A natural candidate is the Left-Right symmetric theory, which led originally to neutrino mass and the seesaw mechanism. In the absence of cancelations of large Dirac Yukawa couplings, we show how such a scenario would require a low scale of Left-Right symmetry breaking roughly below 10 TeV, tantalizingly close to the LHC reach.
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Probing sterile neutrino in $B$ ($D$) meson decays at Belle II (BESIII)
A missing-mass search in semileptonic B decays at Belle II could constrain or discover GeV-scale sterile neutrinos, with sensitivity comparable to or better than upgraded LHCb for masses below 2 GeV.