Testing beyond the Standard Model scenarios in next-generation long-baseline neutrino oscillation experiments

TL;DR

This paper evaluates how next-generation long-baseline neutrino experiments can detect and distinguish various beyond the Standard Model physics scenarios, including new interactions, Lorentz violation, and sterile neutrinos.

Contribution

It provides a comprehensive analysis of the sensitivity of DUNE, T2HK, and T2HKK to three BSM scenarios, highlighting their potential to explore new physics beyond standard neutrino oscillations.

Findings

DUNE and T2HK can constrain and distinguish flavor-dependent long-range interactions.

DUNE has superior sensitivity to CPT-conserving Lorentz invariance violation.

Near detectors enhance sensitivity to active-sterile neutrino oscillations.

Abstract

In this thesis, we assess the sensitivity of next-generation long-baseline neutrino oscillation experiments, DUNE, T2HK, and T2HKK, to three popular beyond the Standard Model (BSM) scenarios. Within the three BSM studies, we examine: (i) long-range neutrino-matter interactions induced by flavor-dependent, anomaly-free gauged baryon-lepton symmetries mediated by ultra-light vector boson, showing that DUNE and T2HK can constrain, discover, and in some favorable cases distinguish among different symmetries; (ii) Lorentz invariance violation (LIV), where we derive analytical dependencies of CPT-conserving and CPT-violating LIV parameters on baseline and energy, highlighting the superior reach of DUNE in probing all the LIV parameters, in contrast to T2HK, which is essentially blind to the CPT-conserving LIV parameters; and (iii) active-sterile oscillations over a broad range of $\Delta m^2_{41}$, where we derive sensitivity to CP phases for benchmark choices of $\Delta m^2_{41}$ and establish exclusion limits, emphasizing the role of near detectors. Together, these studies show that future long-baseline facilities not only resolve the neutrino mass ordering, value of $\delta_{\rm CP}$, and $\theta_{23}$ octant, but also provide powerful probes of BSM physics.