Physics with next generation neutrino experiments: ESSnuSB

TL;DR

ESSnuSBplus proposes a three-source, three-detector facility to measure the leptonic CP phase with high precision and to study neutrino cross-sections in the few hundred MeV range. The work evaluates sensitivity to $\delta_{\rm CP}$ and extends to new-physics channels including sterile neutrinos, invisible neutrino decay, scalar NSI, quantum decoherence, and atmospheric neutrinos. Results indicate world-leading CP sensitivity by leveraging the second oscillation maximum, competitive sterile-neutrino and NSI constraints, and strong atmospheric-neutrino performance, with solar and supernova channels and near-detector synergy under active study. The study underscores ESSnuSBplus as a versatile, high-potential facility for Europe, capable of advancing both standard oscillation physics and a broad range of beyond-3-flavor scenarios.

Abstract

In this proceedings we explore the physics potential of the ESSnuSBplus setup to study beam and non-beam based physics scenarios in both standard and new physics cases. The ESSnuSBplus setup consists of three neutrino sources: the main ESS linac, a low energy monitored neutrino beam and a low energy nuSTORM facility and three detectors: the main far detector and two near detectors. The goal of this facility is to measure the leptonic CP phase with extremely high precision and the neutrino nucleus cross-section in the few hundred MeV region.

Figures (7)

• Figure 1: The ESSnuSBplus facility.
• Figure 2: CP sensitivity of the ESSnuSB experiment.
• Figure 3: Sensitivity of the ESSnuSB experiment to sterile neutrinos.
• Figure 4: Sensitivity of the ESSnuSB experiment to invisible neutrino decay.
• Figure 5: Sensitivity of the ESSnuSB experiment to scalar NSI.