Zishen Guan | Searcharxiv

arXiv2026

Update on non-unitary mixing in the recent NO$ν$A and T2K data

In this paper, we have tested the non-unitary mixing hypothesis with the latest data from NO$ν$A and T2K experiments. We have also analysed their combined data. We have provided the best-fit values of the standard and non standard parameters after the analysis. $90\%$ limits on the non-unitary mixing parameters have also been provided. The constraints on unitary violation is stronger, compared to the constraints obtained from previous data from NO$ν$A and T2K. The tension between NO$ν$A and T2K at the $1\,σ$ for normal mass hierarchy can be reduced for non-unitary mixing due to $α_{10}$, albeit for a value of $|α_{10}|$ larger than the present global $90\%$ limit. Additionally a study of the future sensitivity of NO$ν$A, T2K and DUNE has been provided.

hep-ph↗

arXiv2025

Effects of tau-neutrino detection on non-standard interactions at DUNE with a short discussion on the nature of neutrino mixing

In this paper, we investigate the effects of $ν_τ$ and $\barν_τ$ detection at the DUNE far detector on the experiment's sensitivity to Non-Standard Interactions (NSI) in neutrino propagation. We show that the strongest observable NSI effect in the $ν_τ$ and $\barν_τ$ appearance probabilities arises from $ε_{μτ}$. We have studied the hierarchy sensitivity, CP violation sensitivity and octant sensitivity of DUNE from $ν_τ$ and $\barν_τ$ appearance channels in presence of NSI. We have also studied the detection sensitivity of NSI phases and the future constaints on NSI parameters from the tau neutrino appearance channels in DUNE. Additionally, we examine the role of $ν_τ$ detection in constraining the unitary nature of the PMNS matrix. These studies emphasize the importance of incorporating $ν_τ$ detection in long-baseline neutrino experiments such as DUNE.

hep-ph↗