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Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector

2018-09-10Journal article Open access
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dc.contributor.authorATLAS collaboration (2929 authors)
dc.contributor.authorAguilar Saavedra, Juan Antonio
dc.contributor.authorAmor Dos Santos, Susana Patricia
dc.contributor.authorAraque Espinosa, Juan Pedro
dc.contributor.authorCastro, Nuno Filipe
dc.contributor.authorConde Muino, Patricia
dc.contributor.authorDa Cunha Sargedas De Sousa, Mario Jose
dc.contributor.authorDias DO Vale, Tiago
dc.contributor.authorFaisca Rodrigues Pereira, Rui Miguel
dc.contributor.authorFiolhais, Miguel
dc.contributor.authorGalhardo, Bruno
dc.contributor.authorGomes, Agostinho
dc.contributor.authorGoncalo, Ricardo
dc.contributor.authorJorge, Pedro
dc.contributor.authorMachado Miguens, Joana
dc.contributor.authorMaio, Amelia
dc.contributor.authorManeira, Jose
dc.contributor.authorMendes Gouveia, Emanuel Demetrio
dc.contributor.authorOleiro Seabra, Luis Filipe
dc.contributor.authorOnofre, Antonio
dc.contributor.authorCosta Batalha Pedro, Rute
dc.contributor.authorPereira Peixoto, Ana Paula
dc.contributor.authorSantos, Helena
dc.contributor.authorSaraiva, Joao
dc.contributor.authorSilva, Jose Manuel
dc.contributor.authorTavares Delgado, Ademar
dc.contributor.authorVeloso, Filipe
dc.contributor.authorWolters, Helmut
dc.date.accessioned2019-02-05T16:28:35Z
dc.date.available2019-02-05T16:28:35Z
dc.date.issued2018-09-10
dc.date.updated2019-02-05T16:28:35Z
dc.description.abstractThe observation of Higgs boson production in association with a top quark pair ( tt¯H ), based on the analysis of proton–proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb −1 , and considering Higgs boson decays into bb¯ , WW⁎ , τ+τ− , γγ , and ZZ⁎ , the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the tt¯H searches using a dataset corresponding to integrated luminosities of 4.5 fb −1 at 7 TeV and 20.3 fb −1 at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total tt¯H production cross section at 13 TeV is measured to be 670 ± 90 (stat.) −100+110 (syst.) fb, in agreement with the Standard Model prediction.
dc.description.versionPeer Reviewed
dc.identifierPhys.Lett. B784 (2018) 173-191 Phys. Lett. B 784 (2018) 173; DOI 10.1016/j.physletb.2018.07.035
dc.identifier.urihttp://dx.doi.org/10.1016/j.physletb.2018.07.035
dc.identifier.urihttp://hdl.handle.net/10400.26/27653
dc.language.isoeng
dc.titleObservation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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