Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguity

Autores
Mileo, Nicolás Ismael; Kiers, Ken; Szynkman, Alejandro Andrés; Crane, Daniel; Gegner, Ethan
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present a collection of CP-odd observables for the process pp→t(→bℓ+νℓ)t¯(→b¯ℓ−ν¯ℓ) H that are linearly dependent on the scalar (kt) and pseudoscalar (k˜t) top-Higgs coupling and hence sensitive to the corresponding relative sign. The proposed observables are based on triple product (TP) correlations that we extract from the expression for the differential cross section in terms of the spin vectors of the top and antitop quarks. In order to explore other possibilities, we progressively modify these TPs, first by combining them, and then by replacing the spin vectors by the lepton momenta or the t and t¯ momenta by their visible parts. We generate Monte Carlo data sets for several benchmark scenarios, including the Standard Model (kt = 1, k˜t= 0) and two scenarios with mixed CP properties (kt = 1, k˜t = ± 1). Assuming an integrated luminosity that is consistent with that envisioned for the High Luminosity Large Hadron Collider, using Monte Carlo-truth and taking into account only statistical uncertainties, we find that the most promising observable can disentangle the “CP-mixed” scenarios with an effective separation of ∼ 19σ. In the case of observables that do not require the reconstruction of the t and t¯ momenta, the power of discrimination is up to ∼ 13σ for the same number of events. We also show that the most promising observables can still disentangle the CP-mixed scenarios when the number of events is reduced to values consistent with expectations for the Large Hadron Collider in the near term.
Facultad de Ciencias Exactas
Instituto de Física La Plata
Materia
Ciencias Exactas
Física
Beyond Standard Model
CP violation
Higgs Physics
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/87014
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/87014
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguityMileo, Nicolás IsmaelKiers, KenSzynkman, Alejandro AndrésCrane, DanielGegner, EthanCiencias ExactasFísicaBeyond Standard ModelCP violationHiggs PhysicsWe present a collection of CP-odd observables for the process pp→t(→bℓ<sup>+</sup>ν<sub>ℓ</sub>)t¯(→b¯ℓ<sup>−</sup>ν¯<sub>ℓ</sub>) H that are linearly dependent on the scalar (k<sub>t</sub>) and pseudoscalar (k˜<sub>t</sub>) top-Higgs coupling and hence sensitive to the corresponding relative sign. The proposed observables are based on triple product (TP) correlations that we extract from the expression for the differential cross section in terms of the spin vectors of the top and antitop quarks. In order to explore other possibilities, we progressively modify these TPs, first by combining them, and then by replacing the spin vectors by the lepton momenta or the t and t¯ momenta by their visible parts. We generate Monte Carlo data sets for several benchmark scenarios, including the Standard Model (k<sub>t</sub> = 1, k˜<sub>t</sub>= 0) and two scenarios with mixed CP properties (k<sub>t</sub> = 1, k˜<sub>t</sub> = ± 1). Assuming an integrated luminosity that is consistent with that envisioned for the High Luminosity Large Hadron Collider, using Monte Carlo-truth and taking into account only statistical uncertainties, we find that the most promising observable can disentangle the “CP-mixed” scenarios with an effective separation of ∼ 19σ. In the case of observables that do not require the reconstruction of the t and t¯ momenta, the power of discrimination is up to ∼ 13σ for the same number of events. We also show that the most promising observables can still disentangle the CP-mixed scenarios when the number of events is reduced to values consistent with expectations for the Large Hadron Collider in the near term.Facultad de Ciencias ExactasInstituto de Física La Plata2016info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/87014enginfo:eu-repo/semantics/altIdentifier/issn/1126-6708info:eu-repo/semantics/altIdentifier/doi/10.1007/JHEP07(2016)056info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-22T16:57:33Zoai:sedici.unlp.edu.ar:10915/87014Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-22 16:57:33.608SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguity
title Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguity
spellingShingle Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguity
Mileo, Nicolás Ismael
Ciencias Exactas
Física
Beyond Standard Model
CP violation
Higgs Physics
title_short Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguity
title_full Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguity
title_fullStr Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguity
title_full_unstemmed Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguity
title_sort Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguity
dc.creator.none.fl_str_mv Mileo, Nicolás Ismael
Kiers, Ken
Szynkman, Alejandro Andrés
Crane, Daniel
Gegner, Ethan
author Mileo, Nicolás Ismael
author_facet Mileo, Nicolás Ismael
Kiers, Ken
Szynkman, Alejandro Andrés
Crane, Daniel
Gegner, Ethan
author_role author
author2 Kiers, Ken
Szynkman, Alejandro Andrés
Crane, Daniel
Gegner, Ethan
author2_role author
author
author
author
dc.subject.none.fl_str_mv Ciencias Exactas
Física
Beyond Standard Model
CP violation
Higgs Physics
topic Ciencias Exactas
Física
Beyond Standard Model
CP violation
Higgs Physics
dc.description.none.fl_txt_mv We present a collection of CP-odd observables for the process pp→t(→bℓ<sup>+</sup>ν<sub>ℓ</sub>)t¯(→b¯ℓ<sup>−</sup>ν¯<sub>ℓ</sub>) H that are linearly dependent on the scalar (k<sub>t</sub>) and pseudoscalar (k˜<sub>t</sub>) top-Higgs coupling and hence sensitive to the corresponding relative sign. The proposed observables are based on triple product (TP) correlations that we extract from the expression for the differential cross section in terms of the spin vectors of the top and antitop quarks. In order to explore other possibilities, we progressively modify these TPs, first by combining them, and then by replacing the spin vectors by the lepton momenta or the t and t¯ momenta by their visible parts. We generate Monte Carlo data sets for several benchmark scenarios, including the Standard Model (k<sub>t</sub> = 1, k˜<sub>t</sub>= 0) and two scenarios with mixed CP properties (k<sub>t</sub> = 1, k˜<sub>t</sub> = ± 1). Assuming an integrated luminosity that is consistent with that envisioned for the High Luminosity Large Hadron Collider, using Monte Carlo-truth and taking into account only statistical uncertainties, we find that the most promising observable can disentangle the “CP-mixed” scenarios with an effective separation of ∼ 19σ. In the case of observables that do not require the reconstruction of the t and t¯ momenta, the power of discrimination is up to ∼ 13σ for the same number of events. We also show that the most promising observables can still disentangle the CP-mixed scenarios when the number of events is reduced to values consistent with expectations for the Large Hadron Collider in the near term.
Facultad de Ciencias Exactas
Instituto de Física La Plata
description We present a collection of CP-odd observables for the process pp→t(→bℓ<sup>+</sup>ν<sub>ℓ</sub>)t¯(→b¯ℓ<sup>−</sup>ν¯<sub>ℓ</sub>) H that are linearly dependent on the scalar (k<sub>t</sub>) and pseudoscalar (k˜<sub>t</sub>) top-Higgs coupling and hence sensitive to the corresponding relative sign. The proposed observables are based on triple product (TP) correlations that we extract from the expression for the differential cross section in terms of the spin vectors of the top and antitop quarks. In order to explore other possibilities, we progressively modify these TPs, first by combining them, and then by replacing the spin vectors by the lepton momenta or the t and t¯ momenta by their visible parts. We generate Monte Carlo data sets for several benchmark scenarios, including the Standard Model (k<sub>t</sub> = 1, k˜<sub>t</sub>= 0) and two scenarios with mixed CP properties (k<sub>t</sub> = 1, k˜<sub>t</sub> = ± 1). Assuming an integrated luminosity that is consistent with that envisioned for the High Luminosity Large Hadron Collider, using Monte Carlo-truth and taking into account only statistical uncertainties, we find that the most promising observable can disentangle the “CP-mixed” scenarios with an effective separation of ∼ 19σ. In the case of observables that do not require the reconstruction of the t and t¯ momenta, the power of discrimination is up to ∼ 13σ for the same number of events. We also show that the most promising observables can still disentangle the CP-mixed scenarios when the number of events is reduced to values consistent with expectations for the Large Hadron Collider in the near term.
publishDate 2016
dc.date.none.fl_str_mv 2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/87014
url http://sedici.unlp.edu.ar/handle/10915/87014
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1126-6708
info:eu-repo/semantics/altIdentifier/doi/10.1007/JHEP07(2016)056
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 12.982451

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