On Measurement of Helicity Parameters in Top Quark Decay

Abstract

To enable an evaluation of future measurements of the helicity parameters for &#34; t --> W b &#34; decay in regard to &#34; T_FS violation&#34;, this paper considers the effects of an additional pure-imaginary coupling, (i g/2 Lambda) or (i g), associated with a specific, single additional Lorentz structure, i = S, P, S + P, ... Sizable &#34; T_FS violation&#34; signatures can occur for low-effective mass scales (< 320 GeV), but in most cases can be more simply excluded by 10% precision measurement of the probabilities P(W_L) and P(b_L). Signatures for excluding the presence of &#34; T_FS violation&#34; associated with the two dynamical phase-type ambiguities are investigated.