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

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

1996-11-26

arxiv.org/abs/hep-ex/9611021v1

Phys.Rev.Lett.78:3818-3823,1997

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevLett.78.3818

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).

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