e-Article
Probing the CP nature of the top–Higgs Yukawa coupling in tt¯H𝑡𝑡¯𝐻 and tH events with H→bb¯𝐻→𝑏𝑏¯ decays using the ATLAS detector at the LHC
Document Type
Author
Andrean, Stefio Y., 1991; Backman, Filip, 1991; Barranco Navarro, Laura, 1990; Bohm, Christian, 1946; Clément, Christophe, 1972; Dunne, Katherine, 1987; Hellman, Sten, 1956; Ingebretsen Carlson, Tom, 1989; Kim, Dongwon, 1989; Lee, Suhyun; Lou, Xuanhong, 1995; Milstead, David A., 1970; Moa, Torbjörn, 1953; Pasuwan, Patrawan, 1990; Pereira Sanchez, Laura, 1995; Richter, Stefan, 1988; Shaikh, Nabila W., 1989; Silverstein, Samuel B., 1967; Sjölin, Jörgen, 1968; Strandberg, Sara, 1977; Strübig, Antonia, 1985; Valdés Santurio, Eduardo, 1984
Source
Physics Letters B. 849
Subject
Language
English
ISSN
0370-2693
1873-2445
1873-2445
Abstract
The CP properties of the coupling between the Higgs boson and the top quark are investigated using 139 fb−1 of proton–proton collision data recorded by the ATLAS experiment at the LHC at a centre-of-mass energy of s√=13𝑠=13 TeV. The CP structure of the top quark–Higgs boson Yukawa coupling is probed in events with a Higgs boson decaying into a pair of b-quarks and produced in association with either a pair of top quarks, tt¯H𝑡𝑡¯𝐻, or a single top quark, tH. Events containing one or two electrons or muons are used for the measurement. Multivariate techniques are used to select regions enriched in tt¯H𝑡𝑡¯𝐻 and tH events, where dedicated CP-sensitive observables are exploited. In an extension of the Standard Model (SM) with a CP-odd admixture in the top–Higgs Yukawa coupling, the mixing angle between CP-even and CP-odd couplings is measured to be α=11∘+52∘−73∘𝛼=11−73∘∘+52∘, compatible with the SM prediction corresponding to α=0𝛼=0.