A Direct Reconstruction of the Gaugino Parameters with Phases

Abstract

A simple algebraic algorithm is described to recover the (complex valued) gaugino/Higgsino basic parameters $\mu =|\mu |e^{i{\varphi }_{\mu }}$, $M_1=|M_1|e^{i{\varphi }_{M_1}}$, $M_2=|M_2|$, directly in terms of (a minimal set of) neutralino and chargino masses, accurately measurable at future linear collider energies. An ambiguity in the $M_1$ reconstruction can be resolved by measuring the corresponding $e^{+}{e}^{-}\to {\chi }_1^0{\chi }_2^0$ cross section. This approach should simplify the determination of allowed ranges of the gaugino parameters, in particular if only a partial set of gaugino masses were measured.

Comments: 5 pages, using sprocl.sty (included), 4 PS figures. Contribution to the proceedings of the International Workshop on Linear Colliders, Sitges, Spain, April 28-May 5, 1999