Constraints on top couplings in models with exotic quarks

Details Constraints on top couplings in models with exotic quarks Constraints on top couplings in models with exotic quarks

1998-08-24

arxiv.org/abs/hep-ph/9808400v2

Phys.Rev.Lett. 82 (1999) 1628-1631

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 9 pages. Minor changes and some references added. Final version to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.82.1628

The extension of the Standard Model with exotic quark singlets and doublets introduces large flavor changing neutral couplings between ordinary fermions. We derive inequalities which translate the precise determination of the diagonal Z couplings, in particular at LEP, into stringent bounds on the off-diagonal ones. The resulting limits can be saturated in minimal extensions with one vector doublet or singlet. In this case, 23 and 6 single top events, respectively, are predicted at LEP2 for an integrated luminosity of 500 1/pb per experiment.

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