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Searches for supersymmetry with the ATLAS detector using final states with two leptons and missing transverse momentum in √s=7 TeV proton–proton collisions

CollaborationWith : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Barone, Gaetano / Bell, Paul / Bell, William / Berglund, Frida Elina / Blondel, Alain / Bucci, Francesca / Clark, Allan Geoffrey / Dao, Valerio / Ferrere, Didier / Gadomski, Szymon / Garcia Navarro, Jose Enrique / Gaumer, Olivier / Gonzalez Sevilla, Sergio / Goulette, Marc / Hamilton, Andrew / Iacobucci, Giuseppe / Leger, Annie / Lister, Alison / Martin Dit Latour, Bertrand / Mora Herrera, Maria Clemencia Rosario / Nektarijevic, Snezana / Nikolics, Katalin / Pasztor, Arpad / Pohl, Martin / Rosbach, Kilian / Rosselet, Laurent / Wu, Xin
Published in Physics Letters. B. 2012, vol. 709, no. 3, p. 137-157
Abstract Results of three searches are presented for the production of supersymmetric particles decaying into final states with missing transverse momentum and exactly two isolated leptons, e or μ . The analysis uses a data sample collected during the first half of 2011 that corresponds to a total integrated luminosity of 1 fb−11 fb−1 of √s=7 TeV proton–proton collisions recorded with the ATLAS detector at the Large Hadron Collider. Opposite-sign and same-sign dilepton events are separately studied, with no deviations from the Standard Model expectation observed. Additionally, in opposite-sign events, a search is made for an excess of same-flavour over different-flavour lepton pairs. Effective production cross sections in excess of 9.9 fb for opposite-sign events containing supersymmetric particles with missing transverse momentum greater than 250 GeV are excluded at 95% CL. For same-sign events containing supersymmetric particles with missing transverse momentum greater than 100 GeV, effective production cross sections in excess of 14.8 fb are excluded at 95% CL. The latter limit is interpreted in a simplified electroweak gaugino production model excluding chargino masses up to 200 GeV, under the assumption that slepton decay is dominant.
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ATLAS COLLABORATION. Searches for supersymmetry with the ATLAS detector using final states with two leptons and missing transverse momentum in √s=7 TeV proton–proton collisions. In: Physics Letters. B, 2012, vol. 709, n° 3, p. 137-157. https://archive-ouverte.unige.ch/unige:40357

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Deposited on : 2014-09-19

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