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Phys."],"abstract":"Abstract<\/jats:sc>\n <\/jats:title>In this paper, we use the associated production of top-quark pairs ($$ t\\overline{t} $$<\/jats:tex-math>\n t<\/mml:mi>\n \n t<\/mml:mi>\n \u00af<\/mml:mo>\n <\/mml:mover>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>) with a generic scalar boson (\u03d5<\/jats:italic>) at the LHC (pp<\/jats:italic> \u2192 $$ t\\overline{t}\\phi $$<\/jats:tex-math>\n t<\/mml:mi>\n \n t<\/mml:mi>\n \u00af<\/mml:mo>\n <\/mml:mover>\n \u03d5<\/mml:mi>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>) to explore the sensitivity of a large set of observables to the sign of the CP mixing angle (\u03b1<\/jats:italic>), present in the coupling between the scalar boson and the top quarks. The mass of the scalar boson is set to m<\/jats:italic>\u03d5<\/jats:italic><\/jats:sub> = 125 GeV (the Standard Model Higgs boson mass) and its coupling to top-quarks is varied such that \u03b1<\/jats:italic> = 0\u00b0<\/jats:italic>, 22.5\u00b0<\/jats:italic>, 45.0\u00b0<\/jats:italic>, 67.5\u00b0<\/jats:italic>, 90.0\u00b0<\/jats:italic>, 135.0\u00b0<\/jats:italic> and 180.0\u00b0<\/jats:italic>. Dileptonic final states of the $$ t\\overline{t}\\phi $$<\/jats:tex-math>\n t<\/mml:mi>\n \n t<\/mml:mi>\n \u00af<\/mml:mo>\n <\/mml:mover>\n \u03d5<\/mml:mi>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> system are used (pp<\/jats:italic> \u2192 b\u2113<\/jats:italic>+<\/jats:sup>\u03bd<\/jats:italic>\u2113<\/jats:italic><\/jats:sub>$$ \\overline{b} $$<\/jats:tex-math>\n \n b<\/mml:mi>\n \u00af<\/mml:mo>\n <\/mml:mover>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>\u2113<\/jats:italic>\u2212<\/jats:italic><\/jats:sup>$$ \\overline{\\nu} $$<\/jats:tex-math>\n \n \u03bd<\/mml:mi>\n \u00af<\/mml:mo>\n <\/mml:mover>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>\u2113<\/jats:italic><\/jats:sub>b<\/jats:italic>$$ \\overline{b} $$<\/jats:tex-math>\n \n b<\/mml:mi>\n \u00af<\/mml:mo>\n <\/mml:mover>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>), where the scalar boson is expected to decay according to \u03d5<\/jats:italic> \u2192 $$ b\\overline{b} $$<\/jats:tex-math>\n b<\/mml:mi>\n \n b<\/mml:mi>\n \u00af<\/mml:mo>\n <\/mml:mover>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>. A new method to reconstruct the scalar mass, originally designed for the low mass regime is used, improving the resolution of the Higgs mass by roughly a factor of two. A full phenomenological analysis is performed using Standard Model (SM) background and signal events generated with MadGraph5_aMC@NLO, in turn reconstructed using a kinematical fit. The most sensitive CP-observables are selected to compute Confidence Level (CL) limits as a function of the sign of the top quark Yukawa couplings to the \u03d5<\/jats:italic> boson. We also explore the sensitivity to interference terms using differential distributions and angular asymmetries. Given the significant difference between the pure scalar (\u03c3<\/jats:italic>0+<\/jats:sub>) and pure pseudo-scalar (\u03c3<\/jats:italic>0\u2212<\/jats:italic><\/jats:sub>) production cross section values, it is unlikely the $$ t\\overline{t}\\phi $$<\/jats:tex-math>\n t<\/mml:mi>\n \n t<\/mml:mi>\n \u00af<\/mml:mo>\n <\/mml:mover>\n \u03d5<\/mml:mi>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> channel alone will be sensitive to the sign of the CP-mixing angle or interference terms, even at the end of the LHC. Using the $$ {b}_2^{t\\overline{t}\\phi } $$<\/jats:tex-math>\n \n b<\/mml:mi>\n 2<\/mml:mn>\n \n t<\/mml:mi>\n \n t<\/mml:mi>\n \u00af<\/mml:mo>\n <\/mml:mover>\n \u03d5<\/mml:mi>\n <\/mml:mrow>\n <\/mml:msubsup>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> and $$ {b}_4^{t\\overline{t}\\phi } $$<\/jats:tex-math>\n \n b<\/mml:mi>\n 4<\/mml:mn>\n \n t<\/mml:mi>\n \n t<\/mml:mi>\n \u00af<\/mml:mo>\n <\/mml:mover>\n \u03d5<\/mml:mi>\n <\/mml:mrow>\n <\/mml:msubsup>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> variables, exclusion limits at 95% CL for the CP-even and CP-odd components of the top quark Yukawa couplings are expected to be set to $$ \\overset{\\sim }{\\kappa } $$<\/jats:tex-math>\n \n \u03ba<\/mml:mi>\n ~<\/mml:mo>\n <\/mml:mover>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> \u2208 [-0.698,+0.698] and |\u03ba<\/jats:italic>| \u2208 [0.878,1.04], respectively, at the end of the High Luminosity phase of the LHC (HL-LHC) by using the dileptonic decay channel alone.<\/jats:p>","DOI":"10.1007\/jhep09(2022)246","type":"journal-article","created":{"date-parts":[[2022,10,1]],"date-time":"2022-10-01T06:03:11Z","timestamp":1664604191000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["CP-violation, asymmetries and interferences in $$ t\\overline{t}\\phi $$"],"prefix":"10.1007","volume":"2022","author":[{"given":"Duarte","family":"Azevedo","sequence":"first","affiliation":[]},{"given":"Rodrigo","family":"Capucha","sequence":"additional","affiliation":[]},{"given":"Ant\u00f3nio","family":"Onofre","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7948-0355","authenticated-orcid":false,"given":"Rui","family":"Santos","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2022,9,30]]},"reference":[{"key":"19357_CR1","first-page":"32","volume":"5","author":"AD Sakharov","year":"1967","unstructured":"A.D. 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