Probing Anomalous Top Quark Couplings at the Future Linear Colliders

摘要

In terms of an effective Lagrangian we investigate the possibilities of probing anomalous top quark couplings, t(t~-)H, γt(t~-), Zt(t~-) and tWb at the future linear colliders. It is found that at a linear collider with a c. m. energy s~(1/2)～0.5 - 1.5 TeV and a high luminosity of 1.0 - 1000 fb~(-1), e~+e~-→t(t~-)H is an ideal process in probing anomalous t(t~-)H couplings. We also study in detail the effects of anomalous couplings on t(t~-) spin correlations in the top pair production as well as the top quark decay processes with three bases (helicity, beam line and off-diagonal bases). Our results show that with a c. m. energy s~(1/2)～0.5- 1 TeV and a high luminosity of 1-100 fb~(-1), the anomalous couplings γt(t~-), Zt(t~-) and tWb may be sensitively probed.