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Title

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

AuthorsATLAS Collaboration; Aparisi Pozo, J. A.; Bailey, A.J.; Cabrera, Susana ; Castillo, F.L.; Castillo Mª Victoria; Costa, María José ; Escobar, Carlos ; Estrada, Oscar; Ferrer, Antonio ; Fiorini, L. ; Fullana, Esteban ; Fuster, Juan ; García García, Carmen ; García Navarro, José Enrique ; González de la Hoz, Santiago ; Gonzalvo Rodríguez, Galo Rafael; Guerrero Rojas, J.G.R.; Higón, Emilio ; Lacasta Llácer, Carlos ; Lozano Bahilo, José J.; Madaffari, Daniele; Mamuzic, Judita; Martí García, Salvador ; Martinez Agullo, Pablo; Mitsou, Vasiliki A. ; Moreno Llácer, María ; Poveda, Joaquín ; Rodriguez Bosca, S.; Ruiz Martínez, Arantxa ; Salt, José ; Santra, A.; Sayago Galvan, Ivan; Soldevila, Urmila ; Sánchez Martínez, Javier ; Valero, Alberto ; Valls Ferrer, Juan Antonio ; Vos, Marcel ; Miralles López, Marcos
Issue DateAug-2020
PublisherAmerican Physical Society
CitationPhysical Review Letters 125: 061802 (2020)
AbstractA 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 (tt¯H) 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 tt¯H process is observed with a significance of 5.2 standard deviations. The measured cross section times H→γγ branching ratio is 1.64-0.36+0.38(stat)-0.14+0.17(sys) fb, and the measured rate for tt¯H is 1.43-0.31+0.33(stat)-0.15+0.21(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.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.125.061802
URIhttp://hdl.handle.net/10261/233179
Identifiersdoi: 10.1103/PhysRevLett.125.061802
issn: 1079-7114
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