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Precision measurements at the $Z$ resonance agree well with the standardmodel. However, there is still a hint of a discrepancy, not so much in $R_b$ byitself (which has received a great deal of attention in the past several years)but in the forward-backward asymmetry $A^b_{FB}$ together with $R_b$. The twoare of course correlated. We explore the possibilty that these and othereffects are due to the mixing of $b_L$ and $b_R$ with one or more heavy quarks.Comment: 11 pages, 1 Figure, LaTex fil

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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