Dimension-six CP-conserving operators of the third-family quarks and their effects on collider observables
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
- International Institute of Theoretical and Applied Physics, Iowa State University, Ames, Iowa 50011 (United States)
- Department of Physics, Henan Normal University, Xin Xiang, Henan 453002 (China)
- Institute of High Energy Physics, Academia Sinica, Beijing 100039 (China)
We list all possible dimension-six CP-conserving SU{sub c}(3){times}SU{sub L}(2){times}U{sub Y}(1)-invariant operators involving the third-family quarks which could be generated by new physics at a higher scale. Expressions for these operators after electroweak gauge symmetry breaking and the induced effective couplings Wt{bar b}, Xb{bar b}, and Xt{bar t} (X=Z,{gamma},g,H) are presented. Analytic expressions for the tree level contributions of all these operators to the observables R{sub b} and A{sub FB}{sup b} at CERN LEP I, {sigma}(e{sup +}e{sup {minus}}{r_arrow}b{bar b}) and A{sub FB}{sup b} at LEP II, {sigma}(e{sup +}e{sup {minus}}{r_arrow}t{bar t}) and A{sub FB}{sup t} at the Next Linear Collider (NLC), as well as {sigma}(p{bar p}{r_arrow}t{bar b}+X) at the Fermilab Tevatron upgrade, are provided. The effects of these operators on different electroweak observables are discussed and numerical examples presented. Numerical analyses show that in the coupling region allowed by R{sub b} and A{sub FB}{sup b} at LEP I, some of the new physics operators can still have significant contributions at LEP II, the Tevatron, and the NLC. {copyright} {ital 1997} {ital The American Physical Society}
- DOE Contract Number:
- FG02-94ER40817
- OSTI ID:
- 531989
- Journal Information:
- Physical Review, D, Vol. 56, Issue 1; Other Information: PBD: Jul 1997
- Country of Publication:
- United States
- Language:
- English
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