@article{OPUS4-12956, title = {Search for light scalar top-quark pair production in final states with two leptons with the ATLAS detector in √s=7 TeV proton-proton collisions}, series = {The European Physical Journal C}, volume = {72}, journal = {The European Physical Journal C}, number = {2237}, organization = {ATLAS Collaboration}, doi = {10.1140/epjc/s10052-012-2237-1}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-129561}, year = {2012}, abstract = {A search is presented for the pair production of light scalar top quarks in √s=7 TeV proton-proton collisions recorded with the ATLAS detector at the Large Hadron Collider. This analysis uses the full data sample collected during 2011 running that corresponds to a total integrated luminosity of 4.7 fb\(^{-1}\). Light scalar top quarks are searched for in events with two opposite-sign leptons (e, μ), large missing transverse momentum and at least one jet in the final state. No excess over Standard Model expectations is found, and the results are interpreted under the assumption that the light scalar top decays to a b-quark in addition to an on-shell chargino whose decay occurs through a virtual W boson. If the chargino mass is 106 GeV, light scalar top-quark masses up to 130 GeV are excluded for neutralino masses below 70 GeV.}, language = {en} } @article{OPUS4-12895, title = {Search for second generation scalar leptoquarks in pp collisions at √s=7 TeV with the ATLAS detector}, series = {The European Physical Journal C}, volume = {72}, journal = {The European Physical Journal C}, number = {2151}, organization = {ATLAS Collaboration}, doi = {10.1140/epjc/s10052-012-2151-6}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-128957}, year = {2012}, abstract = {The results of a search for the production of second generation scalar leptoquarks are presented for final states consisting of either two muons and at least two jets or a muon plus missing transverse momentum and at least two jets. A total of 1.03 fb\(^{-1}\) integrated luminosity of proton-proton collision data produced by the Large Hadron Collider at s√=7 TeV and recorded by the ATLAS detector is used for the search. The event yields in the signal regions are found to be consistent with the Standard Model background expectations. The production of second generation leptoquarks is excluded for a leptoquark mass m\(_{LQ}\)<594 (685) GeV at 95 \% confidence level, for a branching ratio of 0.5 (1.0) for leptoquark decay to a muon and a quark.}, language = {en} }