Soft breaking of L μ − L τ symmetry: Light neutrino spectrum and leptogenesis
作者： Biswajit Adhikary
DOI: 10.1103/PHYSREVD.74.033002
关键词:
摘要: Continuous $U(1{)}_{{L}_{\ensuremath{\mu}}\ensuremath{-}{L}_{\ensuremath{\tau}}}$ symmetry can generate quasidegenerate mass spectrum for both left handed light and right heavy Majorana neutrinos assuming that the preserving nonzero parameters are nearly same. There is an accidental $\ensuremath{\mu}\ensuremath{\tau}$ exchange in neutrino terms. This implies ${\ensuremath{\theta}}_{13}=0$ ${\ensuremath{\theta}}_{23}=\frac{\ensuremath{\pi}}{4}$. In addition it generates another zero mixing angle one difference. We restrict ourselves to type-I See-Saw mechanism generation of mass. have found under cosmological lepton asymmetry vanishes. break such a way preserves sector. seen phenomenology be explained soft breaking this symmetry. observed softness depends on degeneracy spectrum. Quasidegeneracy opens option resonant leptogenesis. The restricted through data. sized baryon common scale ${m}_{0}$ order $\sqrt{\ensuremath{\Delta}{m}_{\mathrm{atm}}^{2}}$ corresponding ${10}^{13}\text{ }\text{ }\mathrm{GeV}$. also discussed effect RG evolution asymmetry.
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