Relativistic distorted-wave analysis of the missing-energy spectrum measured with monochromatic ${\nu }_{\mu }$-${}^{12}$C interactions at JSNS${}^2$

Abstract

Recently, the JSNS${}^2$ collaboration measured for the first time the missing-energy distribution of ${}^{12}$C using a monochromatic neutrino beam coming from kaon decays at rest. In this work we present the results of an analysis of this spectrum using the relativistic distorted-wave approach. A new parameterization of the spectral function for neutrons in ${}^{12}$C, which incorporates detailed information from $\left(e,e^{\prime }p\right)$ experiments with high missing-energy resolution has been used. The role of the recoil of the residual nucleus, final-state interactions, and neutrino event generators are discussed.

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