CP Properties of Higgs Boson Interactions with Top Quarks in the t͞tH and tH Processes Using H → γγ with the ATLAS Detector

A study of the charge conjugation and parity (CP) properties of the interaction between the Higgs boson and top quarks is presented. Higgs bosons are identified via the diphoton decay channel (H→γγ), and their production in association with a top quark pair t͞tH or single top quark (tH) is studied....

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Autores principales: Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Orellana, Gonzalo Enrique, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
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Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/141082
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id I19-R120-10915-141082
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
Electroweak interaction
Particle decays
Particle interactions
Particle phenomena
Higgs bosons
Top quark
Hadron colliders
spellingShingle Ciencias Exactas
Física
Electroweak interaction
Particle decays
Particle interactions
Particle phenomena
Higgs bosons
Top quark
Hadron colliders
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
CP Properties of Higgs Boson Interactions with Top Quarks in the t͞tH and tH Processes Using H → γγ with the ATLAS Detector
topic_facet Ciencias Exactas
Física
Electroweak interaction
Particle decays
Particle interactions
Particle phenomena
Higgs bosons
Top quark
Hadron colliders
description A study of the charge conjugation and parity (CP) properties of the interaction between the Higgs boson and top quarks is presented. Higgs bosons are identified via the diphoton decay channel (H→γγ), and their production in association with a top quark pair t͞tH or single top quark (tH) is studied. The analysis uses 139  fb⁻¹ of proton-proton collision data recorded at a center-of-mass energy of √s=13  TeV with the ATLAS detector at the Large Hadron Collider. Assuming a CP-even coupling, the t͞tH process is observed with a significance of 5.2 standard deviations. The measured cross section times H→γγ branching ratio is 1.64<sup>+0.38</sup><sub>-0.36</sub>(stat)<sup>+0.17</sup><sub>-0.14</sub>(sys) fb, and the measured rate for t͞tH is 1.43<sup>+0.33</sup><sub>-0.31</sub>(stat)<sup>+0.21</sup><sub>-0.15</sub>(sys) times the Standard Model expectation. The tH production process is not observed and an upper limit on its rate of 12 times the Standard Model expectation is set. A CP-mixing angle greater (less) than 43 (-43)° is excluded at 95% confidence level.
format Articulo
Articulo
author Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alonso, Francisco
title CP Properties of Higgs Boson Interactions with Top Quarks in the t͞tH and tH Processes Using H → γγ with the ATLAS Detector
title_short CP Properties of Higgs Boson Interactions with Top Quarks in the t͞tH and tH Processes Using H → γγ with the ATLAS Detector
title_full CP Properties of Higgs Boson Interactions with Top Quarks in the t͞tH and tH Processes Using H → γγ with the ATLAS Detector
title_fullStr CP Properties of Higgs Boson Interactions with Top Quarks in the t͞tH and tH Processes Using H → γγ with the ATLAS Detector
title_full_unstemmed CP Properties of Higgs Boson Interactions with Top Quarks in the t͞tH and tH Processes Using H → γγ with the ATLAS Detector
title_sort cp properties of higgs boson interactions with top quarks in the t͞th and th processes using h → γγ with the atlas detector
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/141082
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