Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-11-17
Phys.Rev. D61 (2000) 075007
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 1 figure
Scientific paper
10.1103/PhysRevD.61.075007
The combined LEP/SLD data on the b\bar b forward-backward asymmetry from the Z-pole measurements may imply the presence of new physics in the $Zb\bar b$ couplings. In general, the effect of new physics can be parameterized by $SU_C(3)\times SU_L(2)\times U_Y(1)$ invariant higher dimensional operators. By fitting the recently announced LEP/SLD data on A_b and R_b, the size of the coupling strengths of these operators can be determined. We also found that the new physics operators can be divided into two types, depending on their Higgs field content. The ones involving the Higgs have very mild effects at higher energy colliders, while the other type which do not contain the Higgs field can show significantly large effects on $b\bar b$ production at LEP II, $t\bar t$ production at the NLC and single top production at the Tevatron. The preliminary data from the LEP II measurements disfavors the second type of operators.
Oakes Robert J.
Yang Jin Min
Young Bing--Lin
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