Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at sqrt{s}=7 TeV

0388967 - FZÚ 2013 RIV NL eng J - Journal Article
Aad, G. - Abbott, B. - Abdallah, J. - Böhm, Jan - Chudoba, Jiří - Gallus, Petr - Gunther, Jaroslav - Hruška, I. - Jakoubek, Tomáš - Juránek, Vojtěch - Kepka, Oldřich - Kupčo, Alexander - Kůs, Vlastimil - Lokajíček, Miloš - Marčišovský, Michal - Mikeštíková, Marcela - Myška, Miroslav - Němeček, Stanislav - Růžička, Pavel - Schovancová, Jaroslava - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek - Tic, Tomáš - Valenta, J. - Vrba, Václav - Zeman, Martin … Total 2873 authors
Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at sqrt{s}=7 TeV.
Physics Letters. B. Roč. 717, 1-3 (2012), s. 44-60. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA MŠMT LA08032
Institutional research plan: CEZ:AV0Z10100502
Keywords : ATLAS * LHC * R parity invariance * supersymmetry * symmetry breaking * neutralino NLSP
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 4.569, year: 2012
http://arxiv.org/abs/arXiv:1204.6736

The results of a search for pair production of the lighter scalar partners of top quarks in 2.05 fb-1 of pp collisions at sqrt(s) =7 TeV using the ATLAS experiment at the LHC are reported. Scalar top quarks are searched for in events with two same flavour opposite-sign leptons (electrons or muons) with invariant mass consistent with the Z boson mass, large missing transverse momentum and jets in the final state. The results are interpreted in the framework of R-parity conserving, gauge mediated Supersymmetry breaking `natural' scenarios, where the neutralino is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for the lightest neutralino mass between 115 GeV and 230 GeV at 95% confidence level, reaching an exclusion of the scalar top quark mass of 330 GeV for the lightest neutralino mass of 190 GeV. Scalar top quark masses below 240 GeV are excluded for all values of the lightest neutralino mass above the Z boson mass.
Permanent Link: http://hdl.handle.net/11104/0217884