The Leptonic CP Phase from T2(H)K and Muon Decay at Rest

TL;DR

This paper explores how combining neutrino oscillation data from T2(H)K experiments with muon decay at rest antineutrino data can accurately determine the leptonic CP-violating phase delta, overcoming degeneracies with other parameters.

Contribution

It introduces a combined experimental approach using T2(H)K and muon DAR data to precisely measure the CP-violating phase delta, breaking parameter degeneracies.

Findings

Enhanced sensitivity to delta with combined data

Degeneracies with theta13 and theta23 are resolved

Reliable distinction of delta from 180-delta

Abstract

Combining neutrino oscillations at T2K or T2HK with antineutrinos oscillations from muon decay at rest (DAR) allows a determination of the leptonic CP-violating phase delta. The degeneracies of this phase with theta13 and theta23 are broken and delta can be reliably distinguished from 180-delta. We present the sensitivity to delta of T2(H)K together with a muon DAR experiment using Super-K as a near detector and Hyper-K at the Tochibora site as a far detector.