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

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...

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Autores principales: Mileo, Nicolás Ismael, Kiers, Ken, Szynkman, Alejandro Andrés, Crane, Daniel, Gegner, Ethan
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Exactas
Física
Beyond Standard Model
CP violation
Higgs Physics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/87014
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-87014
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Beyond Standard Model
CP violation
Higgs Physics
spellingShingle Ciencias Exactas
Física
Beyond Standard Model
CP violation
Higgs Physics
Mileo, Nicolás Ismael
Kiers, Ken
Szynkman, Alejandro Andrés
Crane, Daniel
Gegner, Ethan
Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguity
topic_facet Ciencias Exactas
Física
Beyond Standard Model
CP violation
Higgs Physics
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.
format Articulo
Articulo
author Mileo, Nicolás Ismael
Kiers, Ken
Szynkman, Alejandro Andrés
Crane, Daniel
Gegner, Ethan
author_facet Mileo, Nicolás Ismael
Kiers, Ken
Szynkman, Alejandro Andrés
Crane, Daniel
Gegner, Ethan
author_sort Mileo, Nicolás Ismael
title Pseudoscalar top-Higgs coupling: exploration of CP-odd observables to resolve the sign ambiguity
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
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/87014
work_keys_str_mv AT mileonicolasismael pseudoscalartophiggscouplingexplorationofcpoddobservablestoresolvethesignambiguity
AT kiersken pseudoscalartophiggscouplingexplorationofcpoddobservablestoresolvethesignambiguity
AT szynkmanalejandroandres pseudoscalartophiggscouplingexplorationofcpoddobservablestoresolvethesignambiguity
AT cranedaniel pseudoscalartophiggscouplingexplorationofcpoddobservablestoresolvethesignambiguity
AT gegnerethan pseudoscalartophiggscouplingexplorationofcpoddobservablestoresolvethesignambiguity
bdutipo_str Repositorios
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