Search for a Fourth Generation Charge -1/3 Quark via Flavor Changing Neutral Current Decay

Abstract

We report on a search for pair production of a fourth generation charge -1/3 quark (b') in pbar p collisions at sqrt(s) = 1.8 TeV at the Fermilab Tevatron using an integrated luminosity of 93 pb^-1. Both quarks are assumed to decay via flavor changing neutral currents (FCNC). The search uses the signatures gamma + 3 jets + mu-tag and 2 gamma + 2 jets. We see no significant excess of events over the expected background. We place an upper limit on the production cross section times branching fraction that is well below theoretical expectations for a b' quark decaying exclusively via FCNC for b' quark masses up to m(Z) + m(b).

Eleven pages, two postscript figures, submitted to Physical Review Letters

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• The Top Cross Section in Hadronic Collisions
• The Isolated Photon Cross Section in the Central and Forward Rapidity Regions in p-pbar Collisions at sqrt(s) = 1.8 TeV
• A Non-supersymmetric Interpretation of the CDF e+e-γγ+ missing E_T Event

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