Analysis of tbW and ttZ couplings from CLEO and LEP/SLC data

Abstract

We update the constraints on anomalous dimension four $\text{tbw}$ and $\text{ttz}$ couplings by using CLEO $b\text{ra}s\gamma$ and LEP/SLC precision $Z$-pole data. It is found that the data imposes very stringent bounds on them. Moreover, the $2\sigma$ pull from SM predictions of $A_{LR}$(hadrons), $A_b$ and $A_{FB}$(b) have little chance of being explained by the strongly constrained anomalous couplings.

Comments: 8 pages, 3 figures, requires psfig.tex