Search for pair production of a new heavy quark that decays into a W boson and a light quark in pp collisions at √s=8 TeV with the ATLAS detector

ATLAS, Collaboration; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Search for pair production of a new heavy quark that decays into a W boson and a light quark in pp collisions at √s=8 TeV with the ATLAS detector. Physical review. D - particles, fields, gravitation, and cosmology, D92(11), p. 112007. American Physical Society 10.1103/PhysRevD.92.112007

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A search is presented for pair production of a new heavy quark (Q ) that decays into a W boson and a light quark (q ) in the final state where one W boson decays leptonically (to an electron or muon plus a neutrino) and the other W boson decays hadronically. The analysis is performed using an integrated luminosity of 20.3 fb⁻¹ of pp collisions at √s=8 TeV collected by the ATLAS detector at the LHC. No evidence of QQ ¯ production is observed. New chiral quarks with masses below 690 GeV are excluded at 95% confidence level, assuming BR(Q→Wq)=1 . Results are also interpreted in the context of vectorlike quark models, resulting in the limits on the mass of a vectorlike quark in the two-dimensional plane of BR(Q→Wq) versus BR(Q→Hq) .

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