Sub-GeV Atmospheric Neutrinos and CP Violation in DUNE

FCNC, CP violation, and impure Majorana neutrinos

The tree level diagonalization of a neutrino mass matrix with both Majorana and Dirac masses is discussed in a general context. Flavor changing neutral currents in such models are inevitable. Rephasing invariant quantities characterizing CP violation in FCNC FermionHiggs interactions are identified. At the one loop level, the mass eigenstates become of an impure Majorana type. The Possibility o...

Solar Neutrinos and Leptonic CP Violation

We examine the possibility of detecting effects of leptonic CP violation by precise measurement of the solar neutrinos within the framework of standard electroweak theory minimally extended to include neutrino masses and mixing. We prove a “no-go theorem” which states that effects of CP violating phase disappear in the νe survival probability to the leading order in electroweak interaction. The...

Looking for Leptonic Cp Violation with Neutrinos

I discuss some theoretical aspects of how to observe leptonic CP violation. It is divided into two parts, one for CP violation due to Majorana, and the other more conventional leptonic Kobayashi-Maskawa (KM) phases. In the first part, I estimate the effect of Majorana phase to observable of neutrinoless double beta decay experiments by paying a careful attention to the definition of the atmosph...

Implications of the Dirac CP phase upon parametric resonance for sub-GeV neutrinos

CP violation in the lepton sector with Majorana neutrinos

We study CP violation in the lepton sector in extended models with right-handed neutrinos, without and with left-right symmetry, and with arbitrary mass terms. We find the conditions which must be satisfied by the neutrino and charged lepton mass matrices for CP conservation. These constraints, which are independent of the choice of weak basis, are proven to be also sufficient in simple cases. ...