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Search for an invisible scalar in tt¯ final states at the LHC

2023Journal article Open access
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dc.contributor.authorAzevedo, Duarte
dc.contributor.authorCapucha, Rodrigo
dc.contributor.authorChaves, Pedro
dc.contributor.authorMartins, João Bravo
dc.contributor.authorOnofre, A.
dc.contributor.authorSantos, Rui
dc.date.accessioned2024-03-26T19:07:16Z
dc.date.available2024-03-26T19:07:16Z
dc.date.issued2023
dc.description.abstractWe use the current tt¯ experimental analysis to look for Dark Matter (DM) particles hidden in the final state. We present a phenomenological study where we successfully perform the reconstruction of a tt¯ system in the presence of a scalar mediator Y 0, that couples to both Standard Model (SM) and to DM particles. We use a MadGraph5_aMC@NLO simplified DM model, where signal samples of pp → tt¯ Y 0 are generated at the Large Hadron Collider (LHC) with both Charge-Parity (CP) -even and CP-odd couplings of Y 0 to the top quarks. Different mass scales for the Y 0 mediator are considered, from the low mass region (~ 0 GeV) to masses close to the Higgs boson mass (125 GeV). The dileptonic final states of the tt¯ system were used in our analysis. The reconstruction of the tt¯ system is done with a kinematic fit, without reconstructing the mediator. All relevant SM backgrounds for the dileptonic tt¯ search at the LHC are considered. Furthermore, CP angular observables were used to probe the CP-nature of the coupling between the mediator and top-quarks, which allowed to set confidence level (CL) limits for those Yukawa couplings as a function of the mediator mass.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationWe use the current tt¯ experimental analysis to look for Dark Matter (DM) particles hidden in the final state. We present a phenomenological study where we successfully perform the reconstruction of a tt¯ system in the presence of a scalar mediator Y 0, that couples to both Standard Model (SM) and to DM particles. We use a MadGraph5_aMC@NLO simplified DM model, where signal samples of pp → tt¯ Y 0 are generated at the Large Hadron Collider (LHC) with both Charge-Parity (CP) -even and CP-odd couplings of Y 0 to the top quarks. Different mass scales for the Y 0 mediator are considered, from the low mass region (~ 0 GeV) to masses close to the Higgs boson mass (125 GeV). The dileptonic final states of the tt¯ system were used in our analysis. The reconstruction of the tt¯ system is done with a kinematic fit, without reconstructing the mediator. All relevant SM backgrounds for the dileptonic tt¯ search at the LHC are considered. Furthermore, CP angular observables were used to probe the CP-nature of the coupling between the mediator and top-quarks, which allowed to set confidence level (CL) limits for those Yukawa couplings as a function of the mediator mass.pt_PT
dc.identifier.doi10.1007/jhep11(2023)125pt_PT
dc.identifier.eissn1029-8479
dc.identifier.issn1126-6708
dc.identifier.urihttp://hdl.handle.net/10400.21/17223
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.relationCERN/FIS-PAR/0010/2021pt_PT
dc.relationCenter for Theoretical and Computational Physics
dc.relationCenter for Theoretical and Computational Physics
dc.relationMulti-Higgs Phenomenology at LHC and Beyond
dc.relation396021762 – TRR 257pt_PT
dc.relationCollider and gravitational echoes of Full Unification with deep-learning
dc.relation.publisherversionhttps://link.springer.com/article/10.1007/JHEP11(2023)125pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectDark Matter at Colliderspt_PT
dc.subjectNew Light Particlespt_PT
dc.titleSearch for an invisible scalar in tt¯ final states at the LHCpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCenter for Theoretical and Computational Physics
oaire.awardTitleCenter for Theoretical and Computational Physics
oaire.awardTitleMulti-Higgs Phenomenology at LHC and Beyond
oaire.awardTitleCollider and gravitational echoes of Full Unification with deep-learning
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00618%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00618%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/CERN%2FFIS-PAR%2F0025%2F2021/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/CERN%2FFIS-PAR%2F0021%2F2021/PT
oaire.citation.titleJournal of High Energy Physicspt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream3599-PPCDT
oaire.fundingStream3599-PPCDT
person.familyNameSantos
person.givenNameRui
person.identifier100360
person.identifier.ciencia-id5A1A-5794-6DC2
person.identifier.orcid0000-0002-7948-0355
person.identifier.ridF-1956-2010
person.identifier.scopus-author-id10739338800
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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