Signal of New Physics and Chemical Composition of Matter in Core Crossing Neutrinos

TL;DR

This paper investigates how non-standard matter effects in Earth's core influence neutrino flavor conversion, highlighting potential 100% modifications due to chemical composition variations and emphasizing CP violation effects in non-standard interactions.

Contribution

It demonstrates that neutrino oscillations crossing Earth's core can be accurately modeled with first order perturbation theory and reveals significant impacts of Earth's chemical composition on flavor conversion.

Findings

Non-standard matter effects can alter neutrino flavor conversion by up to 100%.

First order perturbation theory effectively describes core crossing neutrino oscillations.

CP violating phases significantly influence non-standard neutral current interactions.

Abstract

We consider non-standard matter effect in flavor conversion of neutrinos crossing the core of the Earth. We show that oscillation of core crossing neutrinos with $E \gsim 0.5$ GeV can be well described by a first order perturbation theory. We show that due to non-standard matter effect varying chemical composition in the Earth can modify the neutrino flavor conversion by 100%. Effects of CP violating phases in non-standard Neutral Current interactions are emphasized in particular.