Updated sensitivity of DUNE in 3+1 scenario with far and near detectors

TL;DR

This paper evaluates DUNE's updated sensitivity to sterile neutrinos in a 3+1 scenario, highlighting the importance of combined near and far detector analysis for improved measurement capabilities.

Contribution

It provides an updated analysis of DUNE's sensitivity to sterile neutrinos using the latest TDR configuration, including both near and far detectors.

Findings

Combined near and far detector analysis enhances sensitivity.

Sensitivity to standard parameters is affected by sterile neutrino presence.

Near detector data improves constraints on sterile mixing parameters.

Abstract

In this paper we present the updated physics sensitivity of DUNE in presence of a light sterile neutrino with both far and near detectors. In the previous studies, the sensitivities were obtained using the configuration of DUNE as described in the conceptual design report (CDR). In this article, we consider the configuration of DUNE as given in the technical design report (TDR) and study the capability of this experiment to constrain the sterile mixing parameters as well as its capability to measure the standard oscillation parameters in 3+1 scenario. Our results show that in 3+1 scenario, the sensitivity of DUNE to measure the mass hierarchy, octant and CP violation deteriorates if we only consider the far detector. However, a combined analysis of far and near detector improves the sensitivity.