Can we observe weak anomalous couplings of heavy quarks through three-jet events?

The rates and corresponding jet distributions for the decay 2 t b&g and the process e+e+ tfg may be sensitive to anomalous dipole-like couplings of heavy quarks to the photon and 2. In the b-quark case, after updating our previous analysis on the constraints imposed by current experiments on Zbb anomalous couplings, we show that the variation of these couplings within their presently allowed ranges leads to rather minor modifications to the Standard Model expectations for 2 + b&g observables. In the t-quark case, significant deviations from the Standard Model predictions for tfg production at the Next Linear Collider are possible. . _ Submitted to Physical Review D. *Work supported by the Department of Energy, contract DE-AC03-76SF00515.