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

References in corpus (7)

• Transverse beam polarization and CP-violating triple-gauge-boson couplings in e+e- -> gamma Z
• CP violation at a linear collider with transverse polarization
• Neutralino Production and Decay at an e^+e^- Linear Collider with Transversely Polarized Beams
• New physics in e+ e- -> Z gamma with polarized beams
• Space-time structure of new physics with polarized beams at the linear collider
• Role of transverse polarization in constraining new physics
• Positron Polarization at the International Linear Collider

Cited by in corpus (4)

• Role of polarization in probing anomalous gauge interactions of the Higgs boson
• Use of transverse beam polarization to probe anomalous VVH interactions at a Linear Collider
• Two-particle kinematic distributions from new physics at an electron-positron collider with polarized beams
• Use of Transverse polarization to probe R-parity violating supersymmetry at ILC