Benchmarking intranuclear cascade models for neutrino scattering with relativistic optical potentials

Background: In neutrino oscillation experiments, the hadrons created in neutrino-nucleus collisions are becoming important observables. The description of final-state interactions (FSI) of hadrons with nuclei in the large phase space probed in these experiments poses a great challenge. In the analys...

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Autores: Nikolakopoulos, A., González Jiménez, Raúl, Jachowicz, N., Niewczas, K., Sánchez, F. M., Udías Moinelo, José Manuel
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/71783
Acceso en línea:https://hdl.handle.net/20.500.14352/71783
Access Level:acceso abierto
Palabra clave:539.1
Cross-sections
Finite nuclei
Orthogonality
Simulation
Protons
E
EP
Física nuclear
2207 Física Atómica y Nuclear
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oai_identifier_str oai:docta.ucm.es:20.500.14352/71783
network_acronym_str ES
network_name_str España
repository_id_str
spelling Benchmarking intranuclear cascade models for neutrino scattering with relativistic optical potentialsNikolakopoulos, A.González Jiménez, RaúlJachowicz, N.Niewczas, K.Sánchez, F. M.Udías Moinelo, José Manuel539.1Cross-sectionsFinite nucleiOrthogonalitySimulationProtonsEEPFísica nuclear2207 Física Atómica y NuclearBackground: In neutrino oscillation experiments, the hadrons created in neutrino-nucleus collisions are becoming important observables. The description of final-state interactions (FSI) of hadrons with nuclei in the large phase space probed in these experiments poses a great challenge. In the analysis of neutrino experiments, which operate under semi-inclusive conditions, cascade models are commonly used for this task. The description of FSI under exclusive conditions on the other hand can be treated successfully by using relativistic optical potentials (ROPs). Purpose: We formulate conditions under which the ROP approach and cascade model can be directly compared. Through this comparison the treatment of FSI in cascade models is studied and benchmarked. Method: We study single proton knockout with data from the T2K experiment's near-detector muon neutrino flux. We feed the NEUT cascade model with events distributed according to the cross section of a relativistic distorted-wave impulse approximation (RDWIA) calculation that uses the real part of an optical potential (rROP). We impose cuts on the missing energy of the resulting events to define a set of events which undergo only elastic FSI; these can be compared to RDWIA calculations with the full optical potential. Results: The NEUT cascade and ROP give similar cross sections for proton kinetic energies T-p > 150 MeV for carbon, oxygen, and calcium nuclei. A necessary condition is that a realistic nuclear density is used to introduce events in the cascade. For T-p < 100 MeV the ROP and NEUT cross sections diverge strongly in shape, and differences in magnitude are larger than 50%. Data of transverse kinematic imbalance allow us to discriminate between different approaches to FSI, in particular the large delta alpha(T) region is sensitive to the presence of nonelastic FSI. Due to experimental errors and a large nonquasielastic contribution, the comparison to T2K data does not give an unambiguous view of FSI. We discuss electron scattering data and provide results for kinematics covered in the e4v analysis. We argue that with a simple cut in missing energy FSI can be studied with minimal confounding factors. Conclusions: The agreement of the ROP and NEUT cascade under T2K conditions lends confidence to these models as a tool in neutrino oscillation analyses for sufficiently large nucleon kinetic energies. Our results urge caution when applying a cascade model for small nucleon energies. The assessment of model assumptions relevant to this region is strongly encouraged. The approach presented in this paper provides novel constraints on cascade models from proton-nucleus scattering and can be easily applied to other neutrino event generators.Amer Physical SocUniversidad Complutense de Madrid20222022-05-1320222022-05-13journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/71783reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/717832026-06-02T12:44:21Z
dc.title.none.fl_str_mv Benchmarking intranuclear cascade models for neutrino scattering with relativistic optical potentials
title Benchmarking intranuclear cascade models for neutrino scattering with relativistic optical potentials
spellingShingle Benchmarking intranuclear cascade models for neutrino scattering with relativistic optical potentials
Nikolakopoulos, A.
539.1
Cross-sections
Finite nuclei
Orthogonality
Simulation
Protons
E
EP
Física nuclear
2207 Física Atómica y Nuclear
title_short Benchmarking intranuclear cascade models for neutrino scattering with relativistic optical potentials
title_full Benchmarking intranuclear cascade models for neutrino scattering with relativistic optical potentials
title_fullStr Benchmarking intranuclear cascade models for neutrino scattering with relativistic optical potentials
title_full_unstemmed Benchmarking intranuclear cascade models for neutrino scattering with relativistic optical potentials
title_sort Benchmarking intranuclear cascade models for neutrino scattering with relativistic optical potentials
dc.creator.none.fl_str_mv Nikolakopoulos, A.
González Jiménez, Raúl
Jachowicz, N.
Niewczas, K.
Sánchez, F. M.
Udías Moinelo, José Manuel
author Nikolakopoulos, A.
author_facet Nikolakopoulos, A.
González Jiménez, Raúl
Jachowicz, N.
Niewczas, K.
Sánchez, F. M.
Udías Moinelo, José Manuel
author_role author
author2 González Jiménez, Raúl
Jachowicz, N.
Niewczas, K.
Sánchez, F. M.
Udías Moinelo, José Manuel
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 539.1
Cross-sections
Finite nuclei
Orthogonality
Simulation
Protons
E
EP
Física nuclear
2207 Física Atómica y Nuclear
topic 539.1
Cross-sections
Finite nuclei
Orthogonality
Simulation
Protons
E
EP
Física nuclear
2207 Física Atómica y Nuclear
description Background: In neutrino oscillation experiments, the hadrons created in neutrino-nucleus collisions are becoming important observables. The description of final-state interactions (FSI) of hadrons with nuclei in the large phase space probed in these experiments poses a great challenge. In the analysis of neutrino experiments, which operate under semi-inclusive conditions, cascade models are commonly used for this task. The description of FSI under exclusive conditions on the other hand can be treated successfully by using relativistic optical potentials (ROPs). Purpose: We formulate conditions under which the ROP approach and cascade model can be directly compared. Through this comparison the treatment of FSI in cascade models is studied and benchmarked. Method: We study single proton knockout with data from the T2K experiment's near-detector muon neutrino flux. We feed the NEUT cascade model with events distributed according to the cross section of a relativistic distorted-wave impulse approximation (RDWIA) calculation that uses the real part of an optical potential (rROP). We impose cuts on the missing energy of the resulting events to define a set of events which undergo only elastic FSI; these can be compared to RDWIA calculations with the full optical potential. Results: The NEUT cascade and ROP give similar cross sections for proton kinetic energies T-p > 150 MeV for carbon, oxygen, and calcium nuclei. A necessary condition is that a realistic nuclear density is used to introduce events in the cascade. For T-p < 100 MeV the ROP and NEUT cross sections diverge strongly in shape, and differences in magnitude are larger than 50%. Data of transverse kinematic imbalance allow us to discriminate between different approaches to FSI, in particular the large delta alpha(T) region is sensitive to the presence of nonelastic FSI. Due to experimental errors and a large nonquasielastic contribution, the comparison to T2K data does not give an unambiguous view of FSI. We discuss electron scattering data and provide results for kinematics covered in the e4v analysis. We argue that with a simple cut in missing energy FSI can be studied with minimal confounding factors. Conclusions: The agreement of the ROP and NEUT cascade under T2K conditions lends confidence to these models as a tool in neutrino oscillation analyses for sufficiently large nucleon kinetic energies. Our results urge caution when applying a cascade model for small nucleon energies. The assessment of model assumptions relevant to this region is strongly encouraged. The approach presented in this paper provides novel constraints on cascade models from proton-nucleus scattering and can be easily applied to other neutrino event generators.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022-05-13
2022
2022-05-13
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/71783
url https://hdl.handle.net/20.500.14352/71783
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Amer Physical Soc
publisher.none.fl_str_mv Amer Physical Soc
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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