Neutralino Production and Decay at an e^+e^- Linear Collider with Transversely Polarized Beams

Abstract

Once supersymmetric neutralinos ${\tilde{\chi }}^0$ are produced copiously at $e^{+}{e}^{-}$ linear colliders, their characteristics can be measured with high precision. In particular, the fundamental parameters in the gaugino/higgsino sector of the minimal supersymmetric extension of the standard model (MSSM) can be analyzed. Here we focus on the determination of possible CP--odd phases of these parameters. To that end, we exploit the electron/positron beam polarization, including transverse polarization, as well as the spin/angular correlations of the neutralino production $e^{+}{e}^{-}\to {\tilde{\chi }}_i^0{\tilde{\chi }}_j^0$ and subsequent 2--body decays ${\tilde{\chi }}_i^0\to {\tilde{\chi }}_k^{0}h,{\tilde{\chi }}_k^{0}Z,{\tilde{\ell }}_R^{\pm }{\ell }^{\mp }$, using (partly) optimized CP--odd observables. If no final--state polarizations are measured, the $Z$ and $h$ modes are independent of the ${\tilde{\chi }}_i^0$ polarization, but CP--odd observables constructed from the leptonic decay mode can help in reconstructing the neutralino sector of the CP--noninvariant MSSM. In this situation, transverse beam polarization does not seem to be particularly useful in probing explicit CP violation in the neutralino sector of the MSSM. This can most easily be accomplished using longitudinal beam polarization.

LaTeX, 25 pages with embedded postscript figures; minor changes, version to appear in Journal of High Energy Physics

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Cited by in corpus (20)

• Spin Analysis of Supersymmetric Particles
• Angular distributions as a probe of anomalous ZZH and gammaZH interactions at a linear collider with polarized beams
• Use of transverse beam polarization to probe anomalous VVH interactions at a Linear Collider
• Neutralino Decays in the Complex MSSM at One-Loop: a Comparison of On-Shell Renormalization Schemes
• Probing SUSY CP Violation in Two-Body Stop Decays at the LHC
• Probing CP-violating contact interactions in e+e- --> HZ with polarized beams
• CP asymmetries with Longitudinal and Transverse Beam Polarizations in Neutralino Production and Decay into the Z^0 Boson at the ILC
• CP asymmetries in chargino production and decay: the three-body decay case
• CP violation at one loop in the polarization-independent chargino production in e+e- collisions
• Selectron production at an e-e- linear collider with transversely polarized beams
• CP observables with spin-spin correlations in chargino production
• Charged lepton distributions as a probe of contact e+e-HZ interactions at a linear collider with polarized beams
• Normal tau polarisation as a sensitive probe of CP violation in chargino decay
• Measurement of CP asymmetries in neutralino production at the ILC
• Two-particle kinematic distributions from new physics at an electron-positron collider with polarized beams
• SUSY CP phases and asymmetries at colliders
• CP asymmetries in the supersymmetric trilepton signal at the LHC
• CP-sensitive spin-spin correlations in neutralino production at the ILC
• Spin and Chirality Effects in Antler-Topology Processes at High Energy $e^{+}{e}^{-}$ Colliders
• Physics aspects of polarized e+ at the linear collider