A custodial symmetry for Zbb

Details A custodial symmetry for Zbb A custodial symmetry for Zbb

2006-05-31

arxiv.org/abs/hep-ph/0605341v2

Phys.Lett.B641:62-66,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages. v2: minor corrections

Scientific paper

10.1016/j.physletb.2006.08.005

We show that a subgroup of the custodial symmetry O(3) that protects delta rho from radiative corrections can also protect the Zbb coupling. This allows one to build models of electroweak symmetry breaking, such as Higgsless, Little Higgs or 5D composite Higgs models, that are safe from corrections to Z-> bb. We show that when this symmetry protects Zbb it cannot simultaneously protect Ztt and Wtb. Therefore one can expect to measure sizable deviations from the SM predictions of these couplings at future collider experiments. We also show under what circumstances Zb_R b_R can receive corrections in the right direction to explain the anomaly in the LEP/SLD forward-backward asymmetry A^b_{FB}.

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