Exploring the Effect of Chiral Torsion on Neutrino Oscillation in Long Baseline Experiments

TL;DR

This paper investigates how torsion in curved spacetime affects neutrino oscillations, proposing that long baseline experiments like DUNE can detect or constrain these effects through modifications in neutrino probabilities.

Contribution

It introduces a torsion-induced four-fermion interaction in neutrino physics and analyzes its impact on neutrino oscillations in long baseline experiments, providing bounds on torsional coupling parameters.

Findings

Torsion modifies neutrino mass terms and oscillation probabilities.

Long baseline experiments can probe torsion effects through neutrino measurements.

Bounds on torsional coupling parameters are established.

Abstract

In curved spacetime, neutrinos experience an extra contribution to their effective Hamiltonian coming from a torsion-induced four-fermion interaction that is diagonal in mass basis and also causes neutrino mixing while propagating through fermionic matter. This geometrical quartic interaction term appears as the modification to the neutrino mass term and significantly influences both neutrino conversion and survival probabilities. Since this term varies linearly with matter density, long baseline (LBL) experiments would be a good choice to probe this effect. We put bounds on torsional coupling parameters and also see the impact of torsion on physics sensitivities in the DUNE experiment.