Abstract.
In most supersymmetric theories, charginos \(\tilde{\chi}^\pm_{1,2}\), mixtures of charged color-neutral gauginos and higgsinos, belong to the class of the lightest supersymmetric particles. They are easy to observe at \(e^+e^-\) colliders. By measuring the total cross sections and the left–right asymmetries with polarized electron beams in \(e^+e^- \rightarrow \tilde{\chi}_i^- \tilde{\chi}_j^+ \, \, [i,j=1,2]\), the chargino masses and the gaugino–higgsino mixing angles can be determined. From these observables the fundamental SUSY parameters can be derived: the SU(2) gaugino mass \(M_2\), the modulus \(|\mu|\) and \(\cos \Phi_\mu\) of the higgsino mass parameter, and \(\tan\beta = v_2/v_1\), the ratio of the vacuum expectation values of the two neutral Higgs doublet fields. The solutions are unique; the CP-violating phase \(\Phi_\mu\) can be determined uniquely by analyzing effects due to the normal polarization of the charginos.
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Received: 3 December 1998 / Published online: 27 April 1999
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Choi, S., Djouadi, A., Song, H. et al. Determining SUSY parameters in chargino pair-production in \(e^+e^-\) collisions. Eur. Phys. J. C 8, 669–677 (1999). https://doi.org/10.1007/s100529901093
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DOI: https://doi.org/10.1007/s100529901093