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Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at root s=7 TeV with the ATLAS detector
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Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at root s=7 TeV with the ATLAS detector
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| ATLAS Collaboration; Amorós Vicente, Gabriel; Cabrera Urbán, Susana; Castillo Giménez, María Victoria; Costa Mezquita, María José; Escobar Ibañez, Carlos; Ferrer Soria, Antonio; Fiorini, Luca; Fuster Verdú, Juan A.; García García, Carmen; González de la Hoz, Santiago; Hernández Jiménez, Yesenia; Higón Rodríguez, Emilio; Irles Quiles, Adrián; Kaci, Mohammed; Lacasta Llácer, Carlos; Lacuesta Miquel, Vicente; Martí García, Salvador; Miñano Moya, Mercedes; Mitsou, Vasiliki; Moles Valls, Regina; Moreno Llácer, María; Oliver García, Elena; Pérez García-Estañ, María Teresa; Romero Adam, E.; Ros Martínez, Eduardo; Salt Cairols, José; Solans Sánchez, Carlos Antonio; Soldevila, U.; Sánchez Martínez, Javier; Torró Pastor, Emma; Valladolid Gallego, E.; Valls Ferrer, Juan Antonio; Villaplana Pérez, Miguel; Vos, Marcel; Wildauer, A. | |||
| Aquest document és un/a article, creat/da en: 2012 | |||
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| A search is preseritecl for same-sign top-quark production and down-type heavy quarks of charge -1/3 in events with two isolated leptons (c or mu) that have the same electric charge, at least two jets and large missing transverse momentum. The data are selected from pp collisions at root s = 7 TeV recorded by the ATLAS detector and correspond to an integrated luminosity of 1.04 fb(-1). The observed data are consistent with expectations from Standard Model processes. Upper limits are set at 95% confidence level on the cross section of new sources of same-sign top-quark pair production of 1.4-2.0 pb depending on the assumed mediator mass. Upper limits are also set on the pair-production cross-section for new heavy down-type quarks; a lower limit of 450 GeV is set at 95% confidence level on the mass of heavy down-type quarks under the assumption that they decay 100% of the time to Wt. | |||
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