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# Search for pair and single production of new heavy quarks that decay to a Z boson and a third-generation quark in $\mathit{pp}$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
 dc.contributor.author Pałka, Marek [SAP14007322] pl dc.contributor.other Współautorami artykułu są członkowie ATLAS Collaboration w liczbie 2896 pl dc.date.accessioned 2015-07-07T12:01:08Z dc.date.available 2015-07-07T12:01:08Z dc.date.issued 2014 pl dc.identifier.issn 1126-6708 pl dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/11982 dc.language eng pl dc.rights Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa * dc.rights.uri http://creativecommons.org/licenses/by/4.0/pl/legalcode * dc.title Search for pair and single production of new heavy quarks that decay to a Z boson and a third-generation quark in $\mathit{pp}$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector pl dc.type JournalArticle pl dc.abstract.en A search is presented for the production of new heavy quarks that decay to a Z boson and a third-generation Standard Model quark. In the case of a new charge +2/3 quark (T ), the decay targeted is $T\rightarrow Zt$, while the decay targeted for a new charge −1/3 quark (B) is B\rightarrow Zb. The search is performed with a dataset corresponding to 20.3 fb$^{-1}$ of pp collisions at $\sqrt{s}=8$ TeV recorded in 2012 with the ATLAS detector at the CERN Large Hadron Collider. Selected events contain a high transverse momentum Z boson candidate reconstructed from a pair of oppositely charged same-flavor leptons (electrons or muons), and are analyzed in two channels defined by the absence or presence of a third lepton. Hadronic jets, in particular those with properties consistent with the decay of a b-hadron, are also required to be present in selected events. Different requirements are made on the jet activity in the event in order to enhance the sensitivity to either heavy quark pair production mediated by the strong interaction, or single production mediated by the electroweak interaction. No significant excess of events above the Standard Model expectation is observed, and lower limits are derived on the mass of vector-like T and B quarks under various branching ratio hypotheses, as well as upper limits on the magnitude of electroweak coupling parameters. pl dc.subject.en hadron-hadron scattering pl dc.description.volume 2014 pl dc.description.number 11 pl dc.description.publication 3,5 pl dc.identifier.doi 10.1007/JHEP11(2014)104 pl dc.identifier.eissn 1029-8479 pl dc.title.journal The Journal of High Energy Physics pl dc.contributor.institution ATLAS Collaboration pl dc.language.container eng pl dc.affiliation Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego pl dc.subtype Article pl dc.identifier.articleid 104 pl dc.rights.original CC-BY; otwarte czasopismo; ostateczna wersja wydawcy; w momencie opublikowania; 0; pl dc.identifier.project ROD UJ / P pl .pointsMNiSW [2014 A]: 40