Publication: Search for Down-Type Fourth Generation Quarks with the ATLAS Detector in Events with One Lepton and Hadronically DecayingWBosons
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American Physical Society (APS)
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Abstract
This Letter presents a search for pair production of heavy down-type quarks decaying via b'->Wt in the lepton + jets channel, as b'b'->WtWt->bbWWWW->lvbbqqqqqq. In addition to requiring exactly one lepton, large missing transverse momentum and at least six jets, the invariant mass of nearby jet pairs is used to identify high transverse momentum W bosons. In data corresponding to an integrated luminosity of 1.04 fb^-1 from pp collisions at sqrt(s) = 7 TeV recorded with the ATLAS detector, a heavy down-type quark with mass less than 480 GeV is excluded at the 95% confidence level.
6 pages plus author list (18 pages total), 5 figures, 2 tables, revised author list, matches published PRL version
6 pages plus author list (18 pages total), 5 figures, 2 tables, revised author list, matches published PRL version
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General Physics, Atlas detector, Nuclear and Plasma Physics (for-2020), FOS: Physical sciences, Physical sciences (for-2020), fourth generation quark, Mathematical Sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Engineering, HADRON-HADRON COLLISIONS, FOURTH GENERATION, General Physics (science-metrix), Particle and High Energy Physics (for-2020), Detectors de radiació, ATLAS Collaboration, Physical Sciences (for), info:eu-repo/classification/ddc/550, hep-ex, ATLAS Detector, Physical Sciences (for-2020), [No Keywords], Física, Particle and High Energy Physics, ATLAS, Nuclear and Plasma Physics, Top quark, Engineering (for-2020), Mathematical sciences (for-2020), Settore FIS/01 - FISICA SPERIMENTALE, down-type quark, Mathematical Sciences (for), Physical Sciences, Engineering (for), Experimental High Energy Physics, Hadronic colliders, Física nuclear, heavy down-type quarks, quark, 2, transverse momentum: high, p p: inclusive reaction, W: transverse momentum, transverse momentum: missing-energy, family: 4, ATLAS, heavy quark: pair production, heavy quark: decay, W: hadronic decay, W: leptonic decay, lepton: hadroproduction, jet: multiple production, jet: multiplicity, mass spectrum: (2jet), mass spectrum: measured, efficiency, cross section: upper limit, CERN LHC Coll, GeV-cms