Speaker
Description
Neutrino oscillations are among the most sensitive tools for exploring physics beyond the Standard Model (BSM). Three such well-motivated BSM scenarios are Scalar Non-Standard Interactions (SNSI), dark Non-Standard Interactions (dark NSI), and Lorentz Invariance Violation (LIV). SNSI is the interaction of neutrinos with environmental fermions, mediated by a scalar particle [1]. One of the most salient features of SNSI is that it appears as a density-dependent correction to the neutrino mass term in the effective Hamiltonian. It introduces absolute neutrino mass dependence in the oscillation probabilities. It may be one of the most unique ways to explore the absolute neutrino mass scale. Another interaction, dark NSI [2], may arise due to the scattering of neutrinos with ultra-light scalar dark matter particles. Now the contribution enters the effective neutrino Hamiltonian as a correction to the mass-squared term. Within the Standard Model Extension framework, neutrinos may also be impacted by LIV, which indicates the possible violation of Lorentz symmetry [3]. LIV consists of both CPT-violating and CPT-conserving components. The interplay of these two components, as well as their individual effects on neutrino oscillations, looks particularly interesting. We see notable impact on neutrino oscillations due to these non-standard physics scenarios. They may significantly impact the CP violation, octant, and mass ordering sensitivities of the current and upcoming neutrino experiments. This talk will particularly focus on the effects on CP phase measurement and parameter degeneracies in upcoming long-baseline experiments. The results also demonstrate that these BSM scenarios can produce distinct yet experimentally testable signatures.
References:
- D. Bezboruah, D.S. Chattopadhyay, A. Medhi, A. Sarker, M.M. Devi, Neutrino oscillations
in presence of diagonal elements of scalar NSI: an analytic approach. JHEP 12, 222 (2025),
[arXiv:2410.05250]. - D. Bezboruah, A. Medhi, M.M. Devi, Dark NSI & neutrino oscillations: probing via
measurements at DUNE and T2HK, [arXiv:2601.04802]. - P. Deka, A. Sarker, M. M. Devi, & S. K. Raut (2026). Interplay of CPT-Violating and CPT-Conserving Lorentz Invariance Violation at DUNE, [arXiv:2607.06513].