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 WR??? 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 WR??? resonances at 95% C.L. lie in the range of 6.1???1.0 pb for WR??? masses ranging from 0.5 to 2.0 TeV. These limits are translated into a lower bound on the allowed right-handed WR??? mass, giving mWR???>1.13??????TeV at 95% C.L.
Search for tb resonances in proton-proton collisions at ???s=7TeV with the ATLAS detector / Aad, G; Aloisio, Alberto; Alviggi, Mariagrazia; Canale, Vincenzo; Cevenini, F.; Chiefari, Giovanni; DELLA VOLPE, Domenico; Merola, Leonardo; Sergio, Patricelli; Conventi, F.; DELLA PIETRA, Massimo; Giordano, Raffaele; Musto, E.; Rossi, E.; Sanchez, A.; Carlino, G.; de Asmundis, R.; Doria, A.; Izzo, V.; Sekhniaidze, G.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 109:(2012), pp. 081801-081819. [10.1103/PhysRevLett.109.081801]
Search for tb resonances in proton-proton collisions at ???s=7TeV with the ATLAS detector
ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CANALE, VINCENZO;CHIEFARI, GIOVANNI;DELLA VOLPE, DOMENICO;MEROLA, LEONARDO;DELLA PIETRA, MASSIMO;GIORDANO, RAFFAELE;Rossi E.;
2012
Abstract
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 WR??? 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 WR??? resonances at 95% C.L. lie in the range of 6.1???1.0 pb for WR??? masses ranging from 0.5 to 2.0 TeV. These limits are translated into a lower bound on the allowed right-handed WR??? mass, giving mWR???>1.13??????TeV at 95% C.L.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
