Improved sensitivities of ESS$\nu$SB from a two-detector fit

TL;DR

This paper explores how a two-detector setup at ESSνSB enhances sensitivity to CP violation and new neutrino physics, including non-standard interactions, nonunitary mixing, and sterile neutrinos.

Contribution

It demonstrates the improved sensitivities achievable with a two-detector configuration for various new physics scenarios in neutrino oscillations.

Findings

Enhanced sensitivity to CP violation with two detectors.

Improved detection prospects for non-standard neutrino interactions.

Better constraints on sterile neutrino mixing parameters.

Abstract

We discuss the improvement of the sensitivity of ESS$\nu$SB to the discovery of CP violation and to new neutrino physics which can be obtained with a two-detector fit of the data of the near and far detectors. In particular, we consider neutrino non-standard interactions generated by very heavy vector mediators, nonunitary neutrino mixing, and neutrino oscillations due to the mixing of the ordinary active neutrinos with a light sterile neutrino.