Chargino Pair Production at $e^{+}{e}^{-}$ Colliders with Polarized Beams

Abstract

The chargino ${\tilde{\chi }}_{1,2}^{\pm }$ system can be reconstructed completely in $e^{+}{e}^{-}$ collisions. By measuring the total cross sections and the asymmetries with polarized beams in $e^{+}{e}^{-}\to {\tilde{\chi }}_i^{+}{\tilde{\chi }}_j^{-}[i,j=1,2]$, the chargino masses and the gaugino-higgsino mixing angles of these states can be determined very accurately. If only the lightest charginos ${\tilde{\chi }}_1^{\pm }$ are kinematically accessible, transverse beam polarization is needed to determine the mixing angles unambiguously. From these observables the fundamental SUSY parameters can be derived: the SU(2) gaugino mass $M_2$, the modulus and the cosine of the CP-violating phase of the higgsino mass parameter $\mu$, and $\tan \beta =v_2/v_1$, the ratio of the vacuum expectation values of the two neutral Higgs doublet fields. [The remaining two-fold ambiguity of the phase can be resolved by measuring the normal polarization of the charginos.]

19 pages including 4 figures

References in corpus (4)

• Physics with e^+e^- Linear Colliders
• Inverting the Supersymmetric Standard Model Spectrum: from Physical to Lagrangian Ino Parameters
• Spin Correlations in Production and Decay of Charginos
• Determining SUSY Parameters in Chargino Pair-Production in $e^{+}{e}^{-}$ Collisions

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