Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Improving CP Measurement with THEIA and Muon Decay at Rest   We explore the possibility of using the recently proposed THEIA detector to
measure the $\bar \nu_\mu \rightarrow \bar \nu_e$ 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 $8^\circ$.

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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: q-fin