Non-Standard Neutrino Interactions in a Modified $\nu$2HDM

TL;DR

This paper proposes a modified $ u$2HDM model that introduces significant non-standard neutrino interactions (NSI) by considering a global $U(1)$-symmetry with right-handed electrons, affecting neutrino physics experiments like DUNE.

Contribution

The work introduces a novel modification to the $ u$2HDM allowing for sizable NSI, and analyzes its experimental constraints and implications for future neutrino experiments.

Findings

Model generates significant NSI consistent with experimental bounds.

Constraints from LEP, lepton flavor violation, and BBN restrict NSI parameters.

NSI impact on DUNE's mass hierarchy and CP violation sensitivity is significant.

Abstract

In the traditional neutrinophilic two-Higgs doublet model ($\nu$2HDM), there is no non-standard neutrino interaction (NSI) as the interactions between the Standard Model fermions with neutrinos are negligibly small due to the tiny mixing of the two scalar doublets. In this work, we propose that if $\nu$2HDM is modified by considering the right-handed electron, $e_R$ is negatively charged under a global $U(1)$-symmetry then one can generate significant amount of NSI along with the tiny Dirac neutrino mass. Depending on different constraints from the LEP experiment, tree level lepton flavor violating processes, big-bang neucleosynthesis etc., we observe that this model significantly restricts the range of permissible NSI parameters, putting a strict upper bound on different NSIs. Furthermore, considering these model-dependent NSIs, we study their impact on the next-generation superbeam experiment, DUNE. We present a detailed discussion on the mass hierarchy sensitivity and the CP-violation discovery study considering the impact of both diagonal as well as off-diagonal NSIs.