Impact of lepton flavour universality violation on CP violation sensitivity of long baseline neutrino oscillation experiments

TL;DR

This paper explores how lepton flavor universality violation, modeled via a Z' boson, impacts CP violation sensitivity in long-baseline neutrino experiments, linking B meson decay anomalies to neutrino oscillation physics.

Contribution

It introduces a model with a Z' boson explaining LFU anomalies and analyzes its effects on neutrino oscillation experiments, establishing constraints from B decay data.

Findings

Constraints on new physics parameters from B decay bounds.

Potential observable effects in NOvA and DUNE experiments.

Implications for CP violation sensitivity in neutrino oscillations.

Abstract

The observation of neutrino oscillation as well as the recent experimental result on lepton flavor universality (LFU) violation in $B$ meson decays are indications of new physics beyond the Standard Model. Many theoretical models, which are introduced in the literature as an extension of SM to explain these observed deviations in LFU, lead to new kind of interactions so-called non-standard interaction (NSI) between the elementary particles. In this paper, we consider a model with an additional $Z'$ boson (which is quite successful in explaining the observed LFU anomalies) and analyze its effect in the lepton flavour violating (LFV) $B_d\to \tau^\pm e^\mp$ decay modes. From the present upper bound of the $B_d\to \tau^\pm e^\mp$ branching ratio, we obtain the constraints on the new physics parameters, which are related to the corresponding NSI parameters in the neutrino sector by $SU(2)_L$ symmetry. These new parameters are expected to have potential implications in the neutrino oscillation studies and in this work we investigate the possibility of observing the effects of these interactions in the currently running and upcoming long-baseline experiments, i.e., NOvA and DUNE respectively.