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

dc.creatorAlonso, Francisco
dc.creatorArduh, Francisco Anuar
dc.creatorDova, María Teresa
dc.creatorHoya, Joaquín
dc.creatorMonticelli, Fernando Gabriel
dc.creatorOrellana, Gonzalo Enrique
dc.creatorWahlberg, Hernán Pablo
dc.creatorThe ATLAS Collaboration
dc.date2020-08
dc.date2022-08-26T13:35:10Z
dc.date.accessioned2023-07-15T05:12:18Z
dc.date.available2023-07-15T05:12:18Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/141082
dc.identifierissn:1079-7114
dc.identifierissn:0031-9007
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7472477
dc.descriptionA 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.
dc.descriptionLa lista completa de autores que integran el documento puede consultarse en el archivo.
dc.descriptionInstituto de Física La Plata
dc.formatapplication/pdf
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by/4.0/
dc.rightsCreative Commons Attribution 4.0 International (CC BY 4.0)
dc.subjectCiencias Exactas
dc.subjectFísica
dc.subjectElectroweak interaction
dc.subjectParticle decays
dc.subjectParticle interactions
dc.subjectParticle phenomena
dc.subjectHiggs bosons
dc.subjectTop quark
dc.subjectHadron colliders
dc.titleCP Properties of Higgs Boson Interactions with Top Quarks in the t͞tH and tH Processes Using H → γγ with the ATLAS Detector
dc.typeArticulo
dc.typeArticulo


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