Probing Nonstandard Neutrino Physics at T2KK

TL;DR

This paper evaluates the T2KK experiment's potential to detect nonstandard neutrino physics phenomena, demonstrating that a two-detector setup enhances sensitivity to effects like quantum decoherence and Lorentz violation.

Contribution

It provides the first detailed sensitivity analysis of the T2KK setup for various nonstandard neutrino physics scenarios, supporting the two-detector configuration.

Findings

Two-detector setup improves sensitivity to nonstandard effects.

Enhanced detection of quantum decoherence and Lorentz violation.

Supports the use of T2KK for probing new physics.

Abstract

Having a far detector in Korea for the J-PARC neutrino beam in addition to one at Kamioka has been shown to be a powerful way to lift neutrino parameter ($\Delta m^2$ and mixing angles) degeneracies. In this talk, I report the sensitivity of the same experimental setup to nonstandard neutrino physics, such as quantum decoherence, violation of Lorentz symmetry (with/without CPT invariance), and nonstandard neutrino interactions with matter. In many cases, two detector setup is better than one detector setup at SK. This observation makes another support for the two detector setup.