Implications of Fermionic Dark Matter on Recent Neutrino Oscillation Data

摘要

175.1 Model Description and Neutrino Phenomenonology Models that can shed light on the origin of neutrino masses and the nature of dark matter (DM) are captivating. Scotogenic model [1] is one such model with an additional scalar doublet η and three right-handed neutrinos N_i (i= 1,2, 3). A Z_2 symmetry forbids tree level neutrino mass. The Yukawa lagrangian is [2]{formula} In this model, neutrinos get their mass at loop level given by{formula} Here {formula}. Various experiments confirmed that neutrinos oscil-late in flavor as they propagate. We consider a mixing matrix of tri-bimaximal (TBM) form with a perturbation to obtain non-zero value for θ13 [3].{formula} where θ? 35° and Φ= 12° [4]. Now, diagonalizing the mass matrix (175.2) gives the flavor structure written in terms of h_(ei) (=h_i), and the mass eigenstates as {formula}We have considered N_1, N_2 are degenerate in mass. Now we constrain the parameter space h_(1,2,3), r_(1,3), m_0 with DM and lepton flavor violating (LFV) decays.