Probing CP-violating contact interactions in e+e- --> HZ with polarized beams

Abstract

We examine very general four-point interactions arising due to new physics contributing to the Higgs production process e+e- --> HZ. We write all possible forms for these interactions consistent with Lorentz invariance. We allow the possibility of CP violation. Contributions to the process from anomalous ZZH and gammaZH interactions studied earlier arise as a special case of our four-point amplitude. Expressions for polar and azimuthal angular distributions of Z arising from the interference of the four-point contribution with the standard-model contribution in the presence of longitudinal and transverse beam polarization are obtained. An interesting CP-odd and T-odd contribution is found to be present only when both electron and positron beams are transversely polarized. Such a contribution is absent when only anomalous ZZH and gammaZH interactions are considered. We show how angular asymmetries can be used to constrain CP-odd interactions at a linear collider operating at a centre-of-mass energy of 500 GeV with transverse beam polarization.

22 pages latex, 9 figures included in submission

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Cited by in corpus (17)

• Role of polarization in probing anomalous gauge interactions of the Higgs boson
• Angular distributions as a probe of anomalous ZZH and gammaZH interactions at a linear collider with polarized beams
• Model-independent analysis of Higgs spin and CP properties in the process $e^{+}{e}^{-}\to t\bar{t}\Phi$
• On the choice of beam polarization in $e^{+}{e}^{-}\to ZZ/Z\gamma$ and anomalous triple gauge-boson couplings
• Use of transverse beam polarization to probe anomalous VVH interactions at a Linear Collider
• Decay-lepton correlations as probes of anomalous ZZH and gammaZH interactions in e+e- --> ZH with polarized beams
• Probing the anomalous triple gauge boson couplings in $e^{+}{e}^{-}\to W^{+}{W}^{-}$ using $W$ polarizations with polarized beams
• Charged lepton distributions as a probe of contact e+e-HZ interactions at a linear collider with polarized beams
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• Two-particle kinematic distributions from new physics at an electron-positron collider with polarized beams
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• Observing CP-violating Higgs Signals with Heavy Majorana Neutrinos
• Production of neutral Higgs bosons associated with Z-boson and photon in 2HDM at future lepton colliders