Discernible NSI Effects in Long-Baseline Neutrino Experiments

TL;DR

This paper investigates how unknown non-standard interactions (NSI) can affect neutrino oscillation measurements in upcoming long-baseline experiments like DUNE and T2HK, highlighting potential degeneracies and impacts on parameter sensitivities.

Contribution

It provides a detailed analysis of the effects of dual NSIs from different sectors on neutrino oscillation parameters and experimental sensitivities, including combined datasets.

Findings

Dual NSIs significantly impact the sensitivity to the atmospheric mixing angle θ23.

Presence of NSIs alters the probabilities and CP sensitivity in long-baseline experiments.

CP asymmetry measurements are notably affected by dual NSIs.

Abstract

Neutrino oscillation in the matter could get affected by the sub-dominant, yet unknown, non-standard interactions. The upcoming long-baseline (LBL) neutrino experiments will be sensitive to these effects and can provide information on the unknown oscillation parameter values. In this article, we study the parameter degeneracies that can occur in DUNE, T2HK experiments, and a combination of both due to nonstandard interactions (NSI), arising simultaneously, from two different off-diagonal sectors, i.e., $e-\mu$ and $e-\tau$. We derive constraints on both the NSI sectors using the combined datasets of NO$\nu$A and T2K. Our analysis reveals a significant impact that dual NSIs may have on the sensitivity of atmospheric mixing angle $\theta_{23}$ in the normal ordering (NO) case. Furthermore, when non-standard interaction from the $e-\mu$ and $e-\tau$ sectors are included, we see significant changes in the probabilities for DUNE, T2HK, and as well as a combined analysis involving both. Moreover, the CP sensitivity gets affected significantly due to the presence of dual NSIs, and, in addition, the CP asymmetry also exhibits an appreciable difference.