Study of a tri-direct littlest seesaw model at MOMENT

Abstract

The flavour symmetry succeeds in explaining the current global fit results. Flavour-symmetry models can be tested by the future experiments that improve the precision of neutrino oscillation parameters, such as the MuOn-decay MEdium baseline NeuTrino beam experiment (MOMENT). In this work, we consider tri-direct littlest seesaw (TDLS) models for a case study, and analyze how much MOMENT can extend our knowledge on the TDLS model. We find that measurements of θ23 and δ are crucial for MOMENT to exclude the model at more than 5σ confidence level, if the best fit values in the last global analysis result is confirmed. Moreover, the 3σ precision of model parameters can be improved at MOMENT by at least a factor of two. Finally, we project the surface at the 3σ confidence level from the model-parameter space to the oscillation-parameter space, and find the potential of MOMENT to observe the sum rule between θ23 and δ predicted by TDLS.