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HEP/Astro Seminar -- Wednesday, 08 November 2000

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

Claus Bloechinger, (Wuerzburg)


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 tan2θW 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

George T. Fleming ( gfleming@mps.ohio-state.edu ), last updated 08 November 2000.

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