Using Spin Correlations to Distinguish Zh from ZA at the International Linear Collider

Abstract

We investigate how to exploit the spin information imparted to the Z boson in associated Higgs production at a future linear collider as an aid in distinguishing between CP-even and CP-odd Higgs bosons. We apply a generalized spin-basis analysis which allowsus to study the possibilities offered by non-traditional choices of spin projection axis. In particular, we find that the Z bosons produced in association with a CP-even Higgs via polarized collisions are in a single transverse spin-state (>90% purity) when we use the Zh-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-odd Higgs yields Z's that are an approximately equal mixture of longitudinal and transverse polarizations. We present a decay angular distribution which could be used to distinguish between the CP-even and CP-odd cases. Finally, we make a few brief remarks about how this distribution would be affected if the Higgs boson turns out to not be a CP-eigenstate.

48 pages, 18 figures, revtex4

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Cited by in corpus (4)

• Exotic Decays of the 125 GeV Higgs Boson
• Constraining anomalous HVV interactions at proton and lepton colliders
• Spin Correlation Effects in Top Quark Pair Production at the LHC
• Charged lepton distributions as a probe of contact e+e-HZ interactions at a linear collider with polarized beams