The paper shows that two-component and four-component spinor calculations of e+e- -> t tbar with a Z' yield the same squared amplitude, and that the coupling dictionary is C_V = a+b and C_A = a-b.
and Haber, Howard E
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Equivalence of two component spinor mechanism and four component spinor mechanism in top quark pair production
The paper shows that two-component and four-component spinor calculations of e+e- -> t tbar with a Z' yield the same squared amplitude, and that the coupling dictionary is C_V = a+b and C_A = a-b.