Articulo
CP Properties of Higgs Boson Interactions with Top Quarks in the t͞tH and tH Processes Using H → γγ with the ATLAS Detector
Registro en:
issn:1079-7114
issn:0031-9007
Autor
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Institución
Resumen
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. La lista completa de autores que integran el documento puede consultarse en el archivo. Instituto de Física La Plata