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Search for pair production of first or second generation leptoquarks in proton-proton collisions at sqrt(s)=7 TeV using the ATLAS detector at the LHC

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Search for pair production of first or second generation leptoquarks in proton-proton collisions at sqrt(s)=7 TeV using the ATLAS detector at the LHC

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ATLAS Collaboration; Mitsou, Vasiliki; Ferrer Soria, Antonio; Cabrera Urbán, Susana; Castillo Giménez, María Victoria; Ros Martínez, Eduardo; Salt Cairols, José; Villaplana Pérez, Miguel; Fiorini, Luca; Fuster Verdú, Juan A.; García García, Carmen; González de la Hoz, Santiago; Hernández Jiménez, Yesenia; Higón Rodríguez, Emilio; Lacasta Llácer, Carlos; Martí García, Salvador

Aquest document és un/a article, creat/da en: 2011

Este documento está disponible también en : 10.1103/PhysRevD.83.112006

This paper describes searches for the pair production of first or second generation scalar leptoquarks using 35 pb(-1) of proton-proton collision data recorded by the ATLAS detector at root s = 7 TeV. Leptoquarks are searched in events with two oppositely-charged muons or electrons and at least two jets, and in events with one muon or electron, missing transverse momentum and at least two jets. After event selection, the observed yields are consistent with the predicted backgrounds. Leptoquark production is excluded at the 95% CL for masses M-LQ < 376 (319) GeV and M-LQ < 422 (362) GeV for first and second generation scalar leptoquarks, respectively, when assuming the branching fraction of a leptoquark to a charged lepton is equal to 1.0 (0.5).

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