Flavons And LFV Decays And Productions Of Pseudoscalar Mesons

Lepton and quark have a large quality grade structure,which cannot be reasonably ex-plained in the standard model(SM).The flavor symmetry model based on the mechanism of Froggatt Nielser(FN)is a good explanation for the fermion mass hierarchy in the SM.The FN mechanism expands the symmetry of SM and introduces a new scalar "Flavon".If Flavon is charged under this symmetry,then SM Fermions coupled with Flavon are also charged under this symmetry.The vacuum expectation value of Flavon can break the symmetry of flavor and is effectively coupled with SM fermion,which generate Yukawa coupling.In the SM,flavor is conservative until the neutrino oscillation was discovered in the solar neutrino experiment in 1986,and the study found that the neutrino undergoes a flavor change in SM,and this flavor change will break SM flavor symmetry,thereby inducing the lepton flavor violation(LFV).However,LFV in the SM is seriously depressed by neutrino mass,and the calculated results are far lower than the corresponding experimental upper limit.For the detection of new physics beyond SM(BSM),it is a popular plan to study the violation of lepton flavor(LFV),and the observation of LFV is likely to prove a strong proof of the existence of new physics(NP).We consider their contributions to the lepton flavor violating(LFV)decays P?lilj and ??liP with li?lj=e,? or ? and P ? {Bs,Bd,D,K,?b,?c,?,?',?} in the simplest Flavon model without Higgs-Flavon mixing.We find that Flavons can produce significant contributions to some of these LFV decay processes.