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# Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in $\sqrt{s}=8$ TeV $\mathit{pp}$ collisions with the ATLAS detector
 dc.contributor.author Pałka, Marek [SAP14007322] pl dc.contributor.other Współautorami artykułu są członkowie ATLAS Collaboration w liczbie 2890 pl dc.date.accessioned 2015-07-07T11:16:50Z dc.date.available 2015-07-07T11:16:50Z dc.date.issued 2014 pl dc.identifier.issn 1126-6708 pl dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/11957 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 top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in $\sqrt{s}=8$ TeV $\mathit{pp}$ collisions with the ATLAS detector pl dc.type JournalArticle pl dc.abstract.en The results of a search for top squark (stop) pair production in final states with one isolated lepton, jets, and missing transverse momentum are reported. The analysis is performed with proton-proton collision data at $\sqrt{s}=8$ TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20 fb$^{-1}$. The lightest supersymmetric particle (LSP) is taken to be the lightest neutralino which only interacts weakly and is assumed to be stable. The stop decay modes considered are those to a top quark and the LSP as well as to a bottom quark and the lightest chargino, where the chargino decays to the LSP by emitting a W boson. A wide range of scenarios with different mass splittings between the stop, the lightest neutralino and the lightest chargino are considered, including cases where the W bosons or the top quarks are off-shell. Decay modes involving the heavier charginos and neutralinos are addressed using a set of phenomenological models of supersymmetry. No significant excess over the Standard Model prediction is observed. A stop with a mass between 210 and 640 GeV decaying directly to a top quark and a massless LSP is excluded at 95% confidence level, and in models where the mass of the lightest chargino is twice that of the LSP, stops are excluded at 95% confidence level up to a mass of 500 GeV for an LSP mass in the range of 100 to 150 GeV. Stringent exclusion limits are also derived for all other stop decay modes considered, and model-independent upper limits are set on the visible cross-section for processes beyond the Standard Model. pl dc.subject.en hadron-hadron scattering pl dc.subject.en proton-proton scattering pl dc.subject.en supersymmetry pl dc.subject.en top squark pl dc.description.volume 2014 pl dc.description.number 11 pl dc.description.publication 6 pl dc.identifier.doi 10.1007/JHEP11(2014)118 pl dc.identifier.eissn 1029-8479 pl dc.identifier.eissn 1127-2236 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 118 pl dc.rights.original CC-BY; otwarte czasopismo; ostateczna wersja wydawcy; w momencie opublikowania; 0; pl dc.identifier.project .pointsMNiSW [2014 A]: 40