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

ATLAS COLLABORATION, G. AAD, M.T. DOVA ET AL

PHYSICAL REVIEW LETTERS

AMER PHYSICAL SOC

Lugar: New York; Año: 2012 vol. 209 p. 81801 - 81821

0031-9007

This Letter presents a search for tb resonances in 1.4 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 W0 R 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 W0 R resonances at 95% C.L. lie in the range of 6.1–1.0 pb for W0 R masses ranging from 0.5 to 2.0 TeV. These limits are translated into a lower bound on the allowed right handed W0 R mass, giving mW0 R > 1.13 TeV at 95% C.L.