Z -> b b-bar Excess from R-Parity Violation
Brahm, David E.
Original · EN
The excess, deficit, and low left-right asymmetry Ab may be explained by a single term Cᶜ Bᶜ B′ ᶜ in the superpotential. This operator violates R-parity and requires a sequential 4th generation. 1-loop diagrams involving squark exchange interfere with the tree-level processes to give an excess of right-handed b quarks, and a deficit of right-handed c quarks. Though the coupling must be large (≈ 2 or 3), the model is phenomenologically and cosmologically acceptable.
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