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We probe the stau neutralino co-annihilation domain of the parameter space allowed by the current experimental bounds on the light Higgs mass, the b→sγ decay, and the amount of neutralino cold dark matter within the framework of minimal SUGRA models at a 500 GeV e+e− linear collider. The most favorable signals of SUSY are stau pair production and neutralino pair production where the small mass difference...
The lighter chargino pair production (e+e−→χ˜1+χ˜1−) is one of the key processes for determination of supersymmetric parameters at a linear collider. If tanβ is a large value, the lighter stau (τ˜1±) might be lighter than the χ˜1±, while the other sleptons stay heavier. This case leads to a cascade decay, χ˜1±→τ˜1±ντ followed by τ˜1±→χ˜10τ±, where χ˜10 is the lightest supersymmetric particle. This...
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