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We investigate how to exploit the spin information imparted to the Z boson inassociated Higgs production at a future linear collider as an aid indistinguishing between CP-even and CP-odd Higgs bosons. We apply a generalizedspin-basis analysis which allowsus to study the possibilities offered bynon-traditional choices of spin projection axis. In particular, we find thatthe Z bosons produced in association with a CP-even Higgs via polarizedcollisions are in a single transverse spin-state (>90% purity) when we use theZh-transverse basis, provided that the Z~bosons are not ultra-relativistic(speed <0.9c). This same basis applied to the associated production of a CP-oddHiggs yields Z's that are an approximately equal mixture of longitudinal andtransverse polarizations. We present a decay angular distribution which couldbe used to distinguish between the CP-even and CP-odd cases. Finally, we make afew brief remarks about how this distribution would be affected if the Higgsboson turns out to not be a CP-eigenstate.Comment: 48 pages, 18 figures, revtex

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Using spin correlations to distinguish<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mi>h</mml:mi></mml:math>from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mi>A</mml:mi></mml:math>at the International Linear Collider

Using spin correlations to distinguishZhfromZAat the International Linear Collider