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Measurement of helicity parameters in top quark decay
1999
European Physical Journal C: Particles and Fields
The standard model(SM) predicts only a g_V-A coupling in t → W^+ b decay. However, if additional Lorentz structures exist, they can manifest themselves in high energy processes such as this via non-SM values of the helicity parameters describing t → W^+ b. Plots and tables of the values of these helicity parameters are obtained for various coupling strengths. Three phase-type ambiguities are uncovered: g_V-A + g_S+P with effective-mass scale Λ_S+P∼ -35 GeV, g_V-A + g_f_M + f_E with Λ_f_M + f_E∼
doi:10.1007/s100520050474
fatcat:q3m5ynrkhba3zgjhkylhtpcaqe