![]() ![]() The flavor eigenstates are related to mass eigenstate by a 3 × 3 unitary matrix, U, known as PMNS after Pontecorvo-Maki-Nakagawa-Sakata: ν α = ∑ i U α i ν i. As a result, a neutrino of flavor α (α ∈. In the framework of “old” electroweak theory, formulated by Glashow, Weinberg and Salam, lepton flavor is conserved and neutrinos are massless. In the end, we review methods to test these models and suggest approaches to break the degeneracies in deriving neutrino mass parameters caused by NSI. We enumerate the bounds that already exist on the electroweak symmetric models and demonstrate that it is possible to build viable models avoiding all these bounds. ![]() The UV complete model should be of course electroweak invariant which in general implies that along with neutrinos, charged fermions also acquire new interactions on which there are strong bounds. These models are based on new U(1) gauge symmetry with a gauge boson of mass ≲ 10 MeV. Our focus will be mainly on neutral current NSI because it is possible to build a class of models that give rise to sizeable NC NSI with discernible effects on neutrino oscillation. Like standard weak interactions, the non-standard interaction can be categorized into two groups: Charged Current (CC) NSI and Neutral Current (NC) NSI. We review such effects and formulate the conditions on the NSI parameters under which the precision measurement of neutrino oscillation parameters can be distorted. If in addition to the standard interactions, neutrinos have subdominant yet-unknown Non-Standard Interactions (NSI) with matter fields, extracting the values of these parameters will suffer from new degeneracies and ambiguities. We also implement the data from the reactor neutrino experiments KamLAND, Daya Bay, RENO, and Double Chooz as well as the long baseline neutrino data from MINOS, T2K, and NOνA. ![]() We consider the most recent data from all solar neutrino experiments and the atmospheric neutrino data from Super-Kamiokande, IceCube, and ANTARES. In the first part of this review, we summarize the current status of the neutrino oscillation parameter determination. Determining the exact values of neutrino mass and mixing parameters is crucial to test various neutrino models and flavor symmetries that are designed to predict these neutrino parameters. The upcoming generation of neutrino experiments will be sensitive to subdominant neutrino oscillation effects that can in principle give information on the yet-unknown neutrino parameters: the Dirac CP-violating phase in the PMNS mixing matrix, the neutrino mass ordering and the octant of θ 23. 2AHEP Group, Institut de Física Corpuscular-Universitat de València/CSIC, Paterna, SpainĬurrent neutrino experiments are measuring the neutrino mixing parameters with an unprecedented accuracy.1School of Physics, Institute for Research in Fundamental Sciences, Tehran, Iran. ![]()
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