Nonstandard interactions of tau neutrino via charged Higgs and $W'$ contribution

TL;DR

This paper investigates how charged Higgs and $W'$ gauge bosons could alter tau neutrino scattering processes, affecting the measurement of neutrino mixing angles and highlighting potential deviations from standard model predictions.

Contribution

It introduces a detailed analysis of charged Higgs and $W'$ contributions to tau neutrino scattering, including form factors, and assesses their impact on neutrino mixing angle measurements.

Findings

Significant deviations in mixing angle measurements due to new physics effects.

Dependence of deviations on neutrino energy.

Potential need to revise standard model assumptions in neutrino experiments.

Abstract

We consider charged Higgs and $W'$ gauge boson contributions to the quasielastic scattering $\nu_{\tau}+ n \rightarrow \tau^- + p$ and $\bar{\nu}_{\tau}+ p \rightarrow \tau^+ + n$ . These effects modify the standard model cross section for these processes and thus impact the extraction of the neutrino mixing angles $\theta_{23}$ and $\theta_{13}$ . We include form factor effects in our calculations and find the deviation of the actual mixing angle from the measured one, assuming the standard model cross section, can be significant and can depend on the energy of the neutrino.