UNSPECIFIED (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, 92 (11): 112007. ISSN 1550-7998
PhysRevD.92.112007.pdf - Published Version
Available under License Creative Commons Attribution.
Download (1MB)
Abstract
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).