Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at=8 TeV with the ATLAS detector
2014 (English)In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, Vol. 9, 5- p.Article in journal (Refereed) Published
The results of a search for direct pair production of the scalar partner to the top quark using an integrated luminosity of 20.1 fb(-1) of proton-proton collision data at = 8 TeV recorded with the ATLAS detector at the LHC are reported. The top squark is assumed to decay via or , where denotes the lightest neutralino (chargino) in supersymmetric models. The search targets a fully-hadronic final state in events with four or more jets and large missing transverse momentum. No significant excess over the Standard Model background prediction is observed, and exclusion limits are reported in terms of the top squark and neutralino masses and as a function of the branching fraction of . For a branching fraction of 100%, top squark masses in the range 270-645 GeV are excluded for masses below 30 GeV. For a branching fraction of 50% to either or , and assuming the mass to be twice the mass, top squark masses in the range 250-550 GeV are excluded for masses below 60 GeV.
Place, publisher, year, edition, pages
2014. Vol. 9, 5- p.
IdentifiersURN: urn:nbn:se:uu:diva-234190DOI: 10.1007/JHEP09(2014)015ISI: 000341821700001OAI: oai:DiVA.org:uu-234190DiVA: diva2:755658
ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP09(2014)0152014-10-152014-10-152014-10-15Bibliographically approved