Approximative two-flavor framework for neutrino oscillations with nonstandard interactions

TL;DR

This paper develops approximate two-flavor neutrino oscillation formulas incorporating nonstandard interactions, especially near the zero mass-squared difference limit, aiding interpretation of experimental data.

Contribution

It introduces a new approximative framework for neutrino oscillations with nonstandard interactions, tested for accuracy and applicable to upcoming experimental energy ranges.

Findings

Approximate formulas match numerical simulations well.

Formulas are most useful in the GeV energy region.

Aid in interpreting degeneracies between standard and nonstandard parameters.

Abstract

In this paper, we develop approximative two-flavor neutrino oscillation formulas including subleading nonstandard interaction effects. Especially, the limit when the small mass-squared difference approaches zero is investigated. The approximate formulas are also tested against numerical simulations in order to determine their accuracy and they will probably be most useful in the GeV energy region, which is the energy region where most upcoming neutrino oscillation experiments will be operating. Naturally, it is important to have analytical formulas in order to interpret the physics behind the degeneracies between standard and nonstandard parameters.