Search for tb Resonances in Proton-Proton Collisions at √s = 7 TeV with the ATLAS Detector

• Autores: Anduaga, Xabier Sebastián; Dova, María Teresa; Monticelli, Fernando Gabriel; Tripiana, Martín Fernando; The ATLAS Collaboration
• Año de publicación: 2012
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Física; Other gauge bosons; Extensions of electroweak gauge sector; Limits on production of particles; Top quarks
• Institución: Universidad Nacional de La Plata

This Letter presents a search for tb resonances in 1:04 fb⁻¹ of LHC proton-proton collision data collected by the ATLAS detector at a center-of-mass energy of 7 TeV. Events with a lepton, missing transverse momentum, and two jets are selected and the invariant mass of the corresponding final state is reconstructed. The search exploits the shape of the tb invariant mass distribution compared to the expected standard model backgrounds. The model of a right-handed WR0 with standard model-like couplings is chosen as the benchmark model for this search. No statistically significant excess of events is observed in the data, and upper limits on the cross section times the branching ratio of W¹R resonances at 95% C.L. lie in the range of 6.1–1.0 pb for W¹R masses ranging from 0.5 to 2.0 TeV. These limits are translated into a lower bound on the allowed right-handed W¹R mass, giving mwR > 1:13 TeV at 95% C.L.
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Instituto de Física La Plata