Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-11-26
JHEP 0402:007,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
29 pages, 15 EPS figures; updated version slightly modified to conform with published version
Scientific paper
10.1088/1126-6708/2004/02/007
Recent comparisons of minimal supergravity (mSUGRA) model predictions with WMAP measurements of the neutralino relic density point to preferred regions of model parameter space. We investigate the reach of linear colliders (LC) with $\sqrt{s}=0.5$ and 1 TeV for SUSY in the framework of the mSUGRA model. We find that LCs can cover the entire stau co-annihilation region provided $\tan\beta \alt 30$. In the hyperbolic branch/focus point (HB/FP) region of parameter space, specialized cuts are suggested to increase the reach in this important ``dark matter allowed'' area. In the case of the HB/FP region, the reach of a LC extends well past the reach of the CERN LHC. We examine a case study in the HB/FP region, and show that the MSSM parameters $\mu$ and $M_2$ can be sufficiently well-measured to demonstrate that one would indeed be in the HB/FP region, where the lightest chargino and neutralino have a substantial higgsino component.
Baer Howard
Belyaev Alexander
Krupovnickas Tadas
Tata Xerxes
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