Phys. Rev. D 53, R2276–R2278 (1996)Increasing Rb and decreasing Rc with new heavy quarks
If the b and c quarks mix with new heavy quarks of weak isospin I3=-1 and 0, respectively, then the Z→bb̅ (cc̅ ) rate is necessarily greater (smaller) than that of the standard model. This may be the reason for the Rb excess and Rc deficit observed at CERN LEP. A possible consequence of this scenario is the prospective discovery of a new quark x with the dominant decay x→ch, then h→bb̅ , where h is a neutral Higgs boson. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.53.R2276
DOI:
10.1103/PhysRevD.53.R2276
PACS:
13.38.Dg, 12.60.-i, 14.70.Hp, 14.80.Bn
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