$R_b$ -- $R_c$ Crisis and New Physics

Details $R_b$ -- $R_c$ Crisis and New Physics $R_b$ -- $R_c$ Crisis and New Physics

1995-12-05

arxiv.org/abs/hep-ph/9512239v1

Phys.Rev.D54:2114-2117,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, REVTEX, no figures

Scientific paper

10.1103/PhysRevD.54.2114

The experimental values of $R_b$ and $R_c$ are the only data which do not seem to agree with Standard Model predictions. Although it is still premature to draw any definite conclusions, it is timely to look for new physics which could explain the excess in $R_b$ and deficit in $R_c$. We investigate this problem in a simple extension of the Standard Model, where a charge $+2/3$ isosinglet quark is added to the standard spectrum. Upon the further introduction of an extra scalar doublet, one finds a solution with interesting consequences.

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