Lepton-number violating four-body decays of heavy mesons

Understand

Neutrinoless hadron Lepton Number Violating (LNV) decays can be induced by virtual Majorana neutrino, which in turn indubitably show the Majorana nature of neutrinos.

• Many three-body LNV processes and Lepton Flavour Violating (LFV) processes have been studied extensively in theory and by experiment.
• As a supplement, we here study 75 four-body LNV (LFV) processes from heavy pseudoscalar $B$ and $D$ decays.
• Most of these processes have not been studied in theory and searched for in experiment, while they may have sizable decay rates.