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Particles and Fields

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Eur. Phys. J. C 22, 563-579 (2001)
DOI: 10.1007/s100520100808

Analysis of the neutralino system in supersymmetric theories

S.Y. Choi1, 2, J. Kalinowski1, 3, G. Moortgat-Pick1 and P.M. Zerwas1

1  Deutsches Elektronen-Synchrotron DESY, 22603 Hamburg, Germany
2  Department of Physics, Chonbuk National University, Chonju 561-756, Korea
3  Instytut Fizyki Teoretycznej, Uniwersytet Warszawski, 00681 Warsaw, Poland

(Received: 24 August 2001 / Published online: 21 November 2001 - © Springer-Verlag / Società Italiana di Fisica 2001 )

Charginos $\tilde{\chi}^\pm$ and neutralinos $\tilde{\chi}^0$ in supersymmetric theories can be produced copiously at e+e- colliders and their properties can be measured with high accuracy. Consecutively to the chargino system, in which the SU(2) gaugino parameter M2, the higgsino mass parameter $\mu$ and $\tan\beta$ can be determined, the remaining fundamental supersymmetry parameter in the gaugino/higgsino sector of the minimal supersymmetric extension of the Standard Model, the U(1) gaugino mass M1, can be analyzed in the neutralino system, including its modulus and its phase in CP-noninvariant theories. The CP properties of the neutralino system are characterized by unitarity quadrangles. Analytical solutions for the neutralino mass eigenvalues and the mixing matrix are presented for CP-noninvariant theories in general. They can be written in compact form for large supersymmetric mass parameters. The closure of the neutralino and chargino systems can be studied by exploiting sum rules for the pair-production processes in e+e- collisions. Thus the picture of the non-colored gaugino and higgsino complex in supersymmetric theories can comprehensively be reconstructed in these experiments.

© Società Italiana di Fisica, Springer-Verlag 2001