Regular Article - Theoretical Physics
Improving CP measurement with THEIA and muon decay at rest
Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, 200240, Shanghai, China
2 Key Laboratory for Particle Astrophysics and Cosmology (MOE) and Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University, 200240, Shanghai, China
Accepted: 31 May 2022
Published online: 30 June 2022
We explore the possibility of using the recently proposed THEIA detector to measure the oscillation with neutrinos from a muon decay at rest (DAR) source to improve the leptonic CP phase measurement. Due to its intrinsic low-energy beam, this THEIA configuration (DAR neutrinos at THEIA) is only sensitive to the genuine leptonic CP phase and not contaminated by the matter effect. With detailed study of neutrino energy reconstruction and backgrounds at the THEIA detector, we find that the combination with the high-energy DUNE can significantly reduce the CP uncertainty, especially around the maximal CP violation cases . Both the THEIA-25 with 17 kt and THEIA-100 with 70 kt fiducial volumes are considered. For DUNE + THEIA-100, the CP uncertainty can be better than .
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