HEP/Astro Seminar -- Wednesday, 08 November 2000

Determination of the gaugino mass parameter M₁ in different linear collider modes

Claus Bloechinger, (Wuerzburg)

Abstract

After the LHC the planned 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 M₁. Mostly the SU(2) gaugino mass parameter M₂ is assumed to be connected with M₁ via the GUT relation M₁ = 5/3 tan²θ_W M₂, which depends on the unification of the gaugino masses M₁, M₂ and M₃ at the GUT-scale. Other supersymmetric models, however, prefer other relations between M₁, M₂ and M₃ at the GUT scale and at the weak scale. Therefore it is necessary to determine M₁ at a LC to test the GUT relation between M₁ and M₂.

For the LC four modes are in discussion: e^-e⁺, e^-e^-, eγ and γγ. For each mode I will present a special process and discuss its use to determine M₁. The talk will end with a comparison of the four modes of the LC.

3:30pm, Smith Lab 1094