Non-commuting ETC corrections to ztt vertex
Abstract
In this paper we calculate the corrections to zt t couplings induced by non-commuting ETC interactions. The extra parameters , s2 and 1 x of non-commuting ETC models and the usual SM parameters will be be assumed to be determined from a global fit to the LEP 1 EW data. We find that in the heavy (light) case FtL is modified by at most 4% (2.8%) relative to its SM value provided < .0088. This implies that it will be very difficult to disentangle the ETC corrections from SM corrections to zt t vertex or to probe the effects of non-commuting ETC on zt t couplings with the projected NLC precision of measuring them.
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