APS » PROLA » Phys. Rev. Lett. » Volume 78 » Issue 20

Phys. Rev. Lett. 78, 3818 - 3823 (1997)

Search for a Fourth Generation Charge -1/3 Quark via Flavor Changing Neutral Current Decay
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S. Abachi et al. (DØ Collaboration)
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Received 26 November 1996

We report on a search for pair production of a fourth generation charge -1/3 quark ( b′) in pp̅ collisions at sqrt[s]  =  1.8 TeV by the DØ experiment at the Fermilab Tevatron using an integrated luminosity of 93 pb-1. Both b′ quarks are assumed to decay via flavor changing neutral currents (FCNC). The search uses the signatures γ+3 jets +μ-tag and 2γ+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′ decaying exclusively via FCNC for b′ masses up to mZ+mb.


©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v78/p3818
DOI: 10.1103/PhysRevLett.78.3818
PACS: 13.85.Rm, 13.40.Hq, 14.65.-q

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