Relativistic distorted-wave analysis of the missing-energy spectrum measured with monochromatic <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ν</mi><mi>μ</mi></msub></math>–<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">C</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>12</mn></mrow></mmultiscripts></mrow></math> interactions at <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>JSNS</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math>

J. M. Franco-Patino; J. García-Marcos; V. Belocchi; M. B. Barbaro; G. Co; R. González-Jiménez

doi:10.1103/pw5w-trjn

Relativistic distorted-wave analysis of the missing-energy spectrum measured with monochromatic $ν_{μ}$ – ${}^{12}C$ interactions at ${JSNS}^{2}$

J. M. Franco-Patino ¹, J. García-Marcos ^2,3, V. Belocchi ^4,5,6,7, M. B. Barbaro ^6,7, G. Co’^1,8, and R. González-Jiménez ⁹

¹INFN Sezione di Lecce, Via Arnesano, I-73100 Lecce, Italy
²Grupo de Física Nuclear, Departamento de Estructura de la Materia, Física Térmica y Electrónica, Facultad de Ciencias Físicas, Universidad Complutense de Madrid and IPARCOS, CEI Moncloa, Madrid 28040, Spain
³Department of Physics and Astronomy, Ghent University, B-9000 Gent, Belgium
⁴Instituto de Física Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas (CSIC) and Universidad de Valencia, E-46980 Paterna, Valencia, Spain
⁵School of Physics, The University of New South Wales (UNSW), Sydney, New South Wales 2052, Australia
⁶Dipartimento di Fisica, Università di Torino, Via P. Giuria 1, 10125 Torino, Italy
⁷INFN, Sezione di Torino, Via Pietro Giuria 1, 10125 Torino, Italy
⁸Dipartimento di Matematica e Fisica “E. De Giorgi,” Università del Salento, I-73100 Lecce, Italy
⁹Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, 41080 Sevilla, Spain

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Phys. Rev. D 114, 013006 – Published 17 July, 2026

DOI: https://doi.org/10.1103/pw5w-trjn

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 parametrization of the spectral function for neutrons in ${}^{12}C$ , which incorporates detailed information from $(e, e^{'} p)$ 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.

Physical Review D

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Relativistic distorted-wave analysis of the missing-energy spectrum measured with monochromatic $ν_{μ}$ – ${}^{12}C$ interactions at ${JSNS}^{2}$

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Relativistic distorted-wave analysis of the missing-energy spectrum measured with monochromatic νμ–C12 interactions at JSNS2

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Relativistic distorted-wave analysis of the missing-energy spectrum measured with monochromatic $ν_{μ}$ – ${}^{12}C$ interactions at ${JSNS}^{2}$