SUSY dark matter ∗ –

A short tour of supersymmetric dark matter and its connection to collider physics. 1. Quest for the dark matter Recently the existence of dark matter has been confirmed through the CMB measurements [1]. Because the baryon density of the universe Ωb is only 1/6 of the matter density of the universe Ωmh = 0.27 ± 0.04, the dark matter should be explained by the physics beyond standard model(SM). There are numerous on-going and planned dark matter search experiments which aim to obtain direct evidence of new particles that constitute the dark matter in the universe. On the other hand, high energy colliders, such as Large Hadron Collider at CERN (LHC) or proposed Linear ee colliders (LC), would significantly extend our ability to explore new physics at the TeV scale. The two approaches— collider experiments and dark matter searches— will open a new regime of the particle physics in this century. Supersymmetry (SUSY) is one of the favorable candidates for new physics at the TeV scale. This is the only non-trivial extension of the Poincare algebra, and the it solves the hierarchy problem of the SM. The minimal supersymmetric extension of standard model (MSSM) is going to be explored up to a few TeV by LHC, and current and future dark matter searches also have sensitivity to supersymmetric dark matter with the mass up to the TeV scale. In the first part of my talk, I summarize SUSY dark matter searches. Once a dark matter signal is observed, the data can be used to study the density profile of our galaxy, which is not fully understood right now. In the latter half of my talk, I discuss the SUSY searches at colliders and more involved studies to measure the masses and interactions of the sparticles. Through the measurements, the thermal relic density and reaction of the SUSY dark matter would be constrained severely. These will be solid bases to discuss astrophysics and cosmology involving SUSY dark matter. a Japanese rescue operation :-)