Constraints for non-standard interaction epsilon_{e tau}V_e from nu_e appearance in MINOS and T2K

TL;DR

This paper uses data from MINOS and T2K experiments to constrain the non-standard interaction epsilon_{e tau}V_e affecting neutrino oscillations, providing bounds on its magnitude and phase under various assumptions.

Contribution

It introduces an analytic framework for neutrino oscillation amplitudes in matter with non-standard interactions, enabling precise constraints from experimental data.

Findings

Constraints on epsilon_{e tau}V_e magnitude and phase

Allowed parameter ranges for non-standard interactions

Analytic expressions for oscillation amplitudes in matter

Abstract

Event rates for nu_e and anti-nu_e appearance oscillations reported by the MINOS and T2K long baseline experiments are used to set constraints on the strength of the non-standard interaction epsilon_{e tau}V_e matter potential. The ranges allowed for the magnitude and phase of epsilon_{e tau} are delineated for scenarios wherein i) other non-standard interactions for neutrinos propagating through the terrestrial crust are negligible, and ii) the real-valued, flavor-diagonal couplings epsilon_{e e} and epsilon_{tau tau} are also operative. Our analysis makes use of accurate analytic forms for the nu_e amplitude A(nu_mu --> nu_e) describing neutrino oscillation in constant-density matter in the presence of epsilon_{e tau}, epsilon_{e e} and epsilon_{tau tau} non- standard interactions.