Zbb Loop Correction with Charge 2/3 Singlet Quarks
Wei-Shu Hou, Hsien-chung Kao
Abstract
We calculate the non-universal correction to the Zbb vertex in a simple extension of the Standard Model, where a charge +2/3 isosinglet quark is added to the standard spectrum. Comparison is made with other solutions to Rb (and Rc) that demand particles lighter than MW.
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