Type-I seesaw models with a spontaneously broken B−L symmetry provide a natural framework for spontaneous leptogenesis driven by a Majoron. The kinetic background of the Majoron acts as a CP-violating source, generating a lepton asymmetry both through the decay of right-handed neutrinos and through equilibration via inverse-decay processes. We construct the Boltzmann equations in a fully...
The study of semileptonic decay plays an important role in extracting the CKM matrix element, where the relevant form factor encodes the nontrivial strong interaction dynamics. We will overview the current achievements on the semileptonic decay, especially from the viewpoint from the relativistic quark model. The observables such as branching fraction, forward-backward asymmetry and...
