Eur. Phys. J. C 24, 619-629 (2002)
DOI: 10.1007/s10052-002-0992-0

Complete one-loop corrections to the mass spectrum of charginos and neutralinos in the MSSM

T. Fritzsche¹ and W. Hollik<sup>1, 2

1</sup>  Institut für Theoretische Physik, Universität Karlsruhe, 76128 Karlsruhe, Germany
²  Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München, Germany

(Received: 26 April 2002 / Published online: 21 June 2002 )

Abstract
The mass spectrum of the chargino-neutralino sector in the minimal supersymmetric standard model (MSSM) is calculated at the one-loop level, based on the complete set of one-loop diagrams. On-shell renormalization conditions are applied to determine the counterterms for the gaugino-mass-parameters M₁, M₂ and the Higgsino-mass parameter . The input is fixed in terms of three pole masses (two charginos and one neutralino); the other pole masses receive a shift with respect to the tree-level masses, which can amount to several GeV. The detailed evaluation shows that both the fermionic/sfermionic loop contributions and the non-(s)fermionic loop contributions are of the same order of magnitude and are thus relevant for precision studies at future colliders.

© Società Italiana di Fisica, Springer-Verlag 2002