Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-05-30
Phys.Lett. B625 (2005) 79-87
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 4 figures
Scientific paper
10.1016/j.physletb.2005.07.068
It has been known that, in the focus point scenario of supersymmetry, the thermal relic of the lightest superparticle (LSP) is known to be a good candidate of the cold dark matter. Assuming that the LSP in the focus-point scenario be the cold dark matter, we address a question how and how well the relic density of the LSP can be determined once the superparticles are found at future e^+e^- linear collider. We will see that the determinations of the mass of the LSP as well as those of the Higgsino-like chargino and neutralinos, which will be possible by a study of the decay kinematics of the chargino or by threshold scan, will give us important information to theoretically reconstruct the relic density. Even if the Higgsino-like superparticles and the LSP are the only superparticles which are kinematically accessible, relic density of the LSP may be calculated with the accuracy of factor \sim 2; by adopting a mild theoretical assumption or by determining the masses of the Wino-like superparticles, uncertaintiy can be reduced to \sim 10 % or smaller.
Moroi Takeo
Shimizu Yasuhiro
Yotsuyanagi Akira
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