Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-01-18
Phys.Lett. B479 (2000) 235-244
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages including 4 figures
Scientific paper
10.1016/S0370-2693(00)00293-8
The chargino $\tilde{\chi}^\pm_{1,2}$ 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.]
Choi Yong-Sang
Guchait Manoranjan
Kalinowski Jan
Zerwas Peter M.
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