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Phys."],"abstract":"<jats:title>A<jats:sc>bstract<\/jats:sc>\n          <\/jats:title>\n          <jats:p>In this paper we explore CP discrimination in the associated production of top-quark pairs (<jats:inline-formula>\n              <jats:alternatives>\n                <jats:tex-math>$$ t\\overline{t} $$<\/jats:tex-math>\n                <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mi>t<\/mml:mi>\n                  <mml:mover>\n                    <mml:mi>t<\/mml:mi>\n                    <mml:mo>\u00af<\/mml:mo>\n                  <\/mml:mover>\n                <\/mml:math>\n              <\/jats:alternatives>\n            <\/jats:inline-formula>) with a generic scalar boson (<jats:italic>\ud835\udf19<\/jats:italic>) at the LHC. We probe the CP-sensitivity of several observables for a varying scalar boson mass and CP-number, either CP-even (<jats:italic>\ud835\udf19<\/jats:italic> = <jats:italic>H<\/jats:italic> ) or CP-odd (<jats:italic>\ud835\udf19<\/jats:italic> = <jats:italic>A<\/jats:italic>), using dileptonic final states of the <jats:inline-formula>\n              <jats:alternatives>\n                <jats:tex-math>$$ t\\overline{t}\\phi $$<\/jats:tex-math>\n                <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mi>t<\/mml:mi>\n                  <mml:mover>\n                    <mml:mi>t<\/mml:mi>\n                    <mml:mo>\u00af<\/mml:mo>\n                  <\/mml:mover>\n                  <mml:mi>\u03d5<\/mml:mi>\n                <\/mml:math>\n              <\/jats:alternatives>\n            <\/jats:inline-formula> system, with <jats:italic>\ud835\udf19 \u2192<\/jats:italic>\n            <jats:inline-formula>\n              <jats:alternatives>\n                <jats:tex-math>$$ b\\overline{b} $$<\/jats:tex-math>\n                <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mi>b<\/mml:mi>\n                  <mml:mover>\n                    <mml:mi>b<\/mml:mi>\n                    <mml:mo>\u00af<\/mml:mo>\n                  <\/mml:mover>\n                <\/mml:math>\n              <\/jats:alternatives>\n            <\/jats:inline-formula>. We show that CP-searches are virtually impossible for <jats:italic>\ud835\udf19<\/jats:italic> boson masses above a few hundred GeV in this channel. A full phenomenological analysis was performed, using Standard Model background and signal events generated with MadGraph5_aMC@NLO and reconstructed using a kinematic fit. The most sensitive CP-observables are used to compute Confidence Levels (CLs), as a function of luminosity, for the exclusion of different signal hypotheses with scalar and pseudoscalar boson masses that range from <jats:italic>m<\/jats:italic>\n            <jats:sub>\n              <jats:italic>\ud835\udf19<\/jats:italic>\n            <\/jats:sub> = 40 GeV up to 200 GeV. We finalize by analysing the impact of a measurement (or limit) of the CP-violating angle in the parameter space of a complex two-Higgs doublet model known as the C2HDM.<\/jats:p>","DOI":"10.1007\/jhep06(2020)155","type":"journal-article","created":{"date-parts":[[2020,6,25]],"date-time":"2020-06-25T19:02:20Z","timestamp":1593111740000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Scalar mass dependence of angular variables in $$ t\\overline{t}\\phi $$ production"],"prefix":"10.1007","volume":"2020","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":[[2020,6,25]]},"reference":[{"key":"13253_CR1","unstructured":"ATLAS collaboration, Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC, Phys. 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