ESSnuSB status

TL;DR

ESSnuSB is a proposed long-baseline neutrino experiment using the ESS linear accelerator to measure CP violation with high precision, covering a significant phase range and planning extensions for cross-section and sterile neutrino studies.

Contribution

The paper presents the design and expected performance of ESSnuSB and its extension project, including new facilities and detectors for neutrino physics research.

Findings

Covering 72% of CP phase range at 5 sigma after 10 years

Achieving better than 8 degrees precision in CP phase measurement

Designing new facilities for neutrino cross-section and sterile neutrino studies

Abstract

ESSnuSB (the European Spallation neutrino Super Beam) is a design study for a long-baseline neutrino experiment to precisely measure the CP violation in the leptonic sector, at the second neutrino oscillation maximum, using a beam driven by the uniquely powerful ESS linear accelerator. The ESSnuSB CDR showed that after 10 years, about 72% of the possible CP violating phase range will be covered with 5 sigma C.L. to reject the no CP violation hypothesis. The expected precision for the CP violating phase is better than 8 degrees for all allowed values, making it the most precise proposed experiment in the field. The extension project, ESSnuSB+, aims in designing two new facilities, a Low Energy nuSTORM and a Low Energy Monitored Neutrino Beam to use them to precisely measure the neutrino-nucleus cross-section in the energy range of 0.2 to 0.6 GeV. A new water Cherenkov detector will also be designed to measure cross sections and serve to explore the sterile neutrino case.