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

Collaboration, D; (1997) Search for a Fourth Generation Charge -1/3 Quark via Flavor Changing Neutral Current Decay. Physical Review Letters , 78 (20) 3818 - 3823. 10.1103/PhysRevLett.78.3818. Green open access

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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).

Type: Article
Title: Search for a Fourth Generation Charge -1/3 Quark via Flavor Changing Neutral Current Decay
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.78.3818
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.78.3818
Language: English
Additional information: © 1997 The American Physical Society Eleven pages, two postscript figures, submitted to Physical Review Letters
URI: https://discovery.ucl.ac.uk/id/eprint/1373918
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