Determination of Gaugino Mass Parameters in various Linear Collider Modes

por Dr. Claus Bloechinger (Univ of Wuerzburg)

martes 22 may. 2001 16:30 → 17:30 Europe/Madrid

Sala de Juntas del IFIC (Edf. Institutos de Investigación)

After the LHC the planed Linear Collider (LC) will be the next step in the search for physics beyond the Standard Model. The Minimal Supersymmetric Standard Model (MSSM) is one of the favoured candidates of this search. It is one of the aims of a LC to determine the underlying parameters of the MSSM with high precision. One of the free parameters of the MSSM is the U(1) gaugino mass parameter $M_1$. Mostly the SU(2) gaugino mass parameter $M_2$ is assumed to be connected with $M_1$ via s standard GUT relation which depends on the unification of the gaugino masses $M_1$, $M_2$ and $M_3$ at the GUT-scale. Other supersymmetric models, however, prefer other relations between $M_1$, $M_2$ and $M_3$ at the GUT scale and at the weak scale. Therefore it is necessary to determine $M_1$ at a LC to test the GUT relation between $M_1$ and $M_2$. The LC will - hopefully - run in four modes: For the LC four modes are in discussion: $e^-e^+$, $e^-e^-$, $e\gamma$ and $\gamma\gamma$. For each mode I will present a special process and discuss its use to determine $M_1$. The talk will end with a comparison of the four modes of the LC.