Improving CP Measurement with THEIA and Muon Decay at Rest

Abstract

We explore the possibility of using the recently proposed THEIA detector to measure the ${\bar{\nu }}_{\mu }\to {\bar{\nu }}_e$ oscillation with neutrinos from a muon decay at rest ($\mu$DAR) source to improve the leptonic CP phase measurement. Due to its intrinsic low-energy beam, this $\mu$THEIA configuration ($\mu$DAR neutrinos at THEIA) is only sensitive to the genuine leptonic CP phase ${\delta }_D$ 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 ${\delta }_D=\pm 90^{\circ }$. Both the $\mu$THEIA-25 with 17kt and $\mu$THEIA-100 with 70kt fiducial volumes are considered. For DUNE + $\mu$THEIA-100, the CP uncertainty can be better than $8^{\circ }$.

arXiv comment26 pages, 17 figures, and 1 table

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