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Light Higgs searches in t(t)over-bar phi production at the LHC

2021-04-09Journal article Open access
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dc.contributor.authorAzevedo, Duarte
dc.contributor.authorCapucha, Rodrigo
dc.contributor.authorGouveia, Emanuel
dc.contributor.authorOnofre, Antonio
dc.contributor.authorSantos, Rui
dc.date.accessioned2021-05-04T11:19:22Z
dc.date.available2021-05-04T11:19:22Z
dc.date.issued2021-04-09
dc.description.abstractIn this paper we propose a new reconstruction method to explore the low mass region in the associated production of top-quark pairs (t (t) over bar) with a generic scalar boson (phi) at the LHC. The new method of mass reconstruction shows an improved resolution of at least a factor of two in the low mass region when compared to previous methods, without the loss of sensitivity of previous analyses. It turns out that it also leads to an improvement of the mass reconstruction of the 125 GeV Higgs for the same production process. We use an effective Lagrangian to describe a scalar with a generic Yukawa coupling to the top quarks. 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 use of CP-sensitive variables allows then to maximize the distinction between CP-even and CP-odd components of the Yukawa couplings. Confidence Levels (CLs) for the exclusion of phi bosons with mixed CP (both CP-even and CP-odd components) were determined as a function of the top Yukawa couplings to the phi boson. The mass range analysed starts slightly above the Upsilon mass up to 40 GeV, although the analysis can be used for an arbitrary mass. If no new light scalar is found, exclusion limits at 95% CL for the absolute value of the CP-even and CP-odd Yukawa are derived. Finally, we analyse how these limits constrain the parameter space of the complex two-Higgs doublet model (C2HDM).pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAZEVEDO, Duarte; [et al] – Light Higgs searches in t(t)over-bar phi production at the LHC. Journal of High Energy Physics. ISSN 1029-8479. Vol. 2021, N.º 4 (2021), pp. 1-22pt_PT
dc.identifier.doi10.1007/JHEP04(2021)077pt_PT
dc.identifier.issn1029-8479
dc.identifier.urihttp://hdl.handle.net/10400.21/13277
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.relationUIDB/00618/2020 - FCTpt_PT
dc.relationUIDP/00618/2020 - FCTpt_PT
dc.relationPTDC/FIS-PAR/31000/2017 - FCTpt_PT
dc.relationCERN/FISPAR/0002/2017 - FCTpt_PT
dc.relationCERN/FIS-PAR/0014/2019 - FCTpt_PT
dc.relationUMO-2015/18/M/ST2/0518 - HARMONIA projectpt_PT
dc.relationCERN/FIS-PAR/0029/2019 - FCT European Commissionpt_PT
dc.relationPDPD/BD/128231/2016 - FCT European Commissionpt_PT
dc.relationCERN/FISPAR/0002/2019 - FCT European Commissionpt_PT
dc.relation.publisherversionhttps://link.springer.com/content/pdf/10.1007/JHEP04(2021)077.pdfpt_PT
dc.subjectBeyond Standard Modelpt_PT
dc.subjectCP violationpt_PT
dc.titleLight Higgs searches in t(t)over-bar phi production at the LHCpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage22pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleJournal of High Energy Physicspt_PT
oaire.citation.volume2021
person.familyNameAzevedo
person.familyNameGouveia
person.familyNameOnofre
person.familyNameSantos
person.givenNameDuarte
person.givenNameEmanuel
person.givenNameAntonio
person.givenNameRui
person.identifier100360
person.identifier.ciencia-idEE1E-B7A4-FD9A
person.identifier.ciencia-id031D-2D20-B65D
person.identifier.ciencia-id391A-A892-2786
person.identifier.ciencia-id5A1A-5794-6DC2
person.identifier.orcid0000-0002-2647-1893
person.identifier.orcid0000-0002-7785-2047
person.identifier.orcid0000-0003-3471-2703
person.identifier.orcid0000-0002-7948-0355
person.identifier.ridF-1956-2010
person.identifier.scopus-author-id10739338800
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublicationa05da55e-498b-442d-86ba-25557dbcfd87
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relation.isAuthorOfPublicationf972a9bd-1bdd-4a47-8d1e-94e9595eddc0
relation.isAuthorOfPublication.latestForDiscovery32a0345e-a190-40aa-a0ef-ae72f56b571b

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