CP--violating Chargino Contributions to the Higgs Coupling to Photon Pairs in the Decoupling Regime of Higgs Sector

Abstract

In most supersymmetric theories, charginos ${\tilde{\chi }}_{1,2}^{\pm }$ belong to the class of the lightest supersymmetric particles and the couplings of Higgs bosons to charginos are in general complex so that the CP--violating chargino contributions to the loop--induced coupling of the lightest Higgs boson to photon pairs can be sizable even in the decoupling limit of large pseudoscalar mass $m_A$ with only the lightest Higgs boson kinematically accessible at future high energy colliders. We introduce a specific benchmark scenario of CP violation consistent with the electric dipole moment constraints and with a commonly accepted baryogenesis mechanism in the minimal supersymmetric Standard Model. Based on the benchmark scenario of CP violation, we demonstrate that the fusion of the lightest Higgs boson in linearly polarized photon--photon collisions can allow us to confirm the existence of the CP--violating chargino contributions {\it even in the decoupling regime of the Higgs sector} for nearly degenerate SU(2) gaugino and higgsino mass parameters of about the electroweak scale.

1+13 pages, 3 eps figures

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• Obstructed D-Branes in Landau-Ginzburg Orbifolds
• LHC Signatures of Resonant CP Violation in a Minimal Supersymmetric Higgs Sector
• Study of CP Property of the Higgs at a Photon Collider using $\gamma \gamma \to t\bar{t}\to lX$
• Diffraction as a CP and Lineshape Analyzer for MSSM Higgs Bosons at the LHC
• Resonant CP Violation in MSSM Higgs Production and Decay at $\gamma \gamma$ Colliders
• Signals for CP Violation in Split Supersymmetry
• Higgs Phenomenology with CPsuperH
• CP-odd A^0 production at e^+e^- colliders in MSSM with CP violating phases
• Refining the predictions of supersymmetric CP-violating models: A top-down approach