Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-12-05
Phys.Rev.D83:055018,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 1 figure; references added
Scientific paper
10.1103/PhysRevD.83.055018
The LEP experiments give a lower bound on the neutralino mass of about 46 GeV which, however, relies on a supersymmetric grand unification relation. Dropping this assumption, the experimental lower bound on the neutralino mass vanishes completely. Recent analyses suggest, however, that in the minimal supersymmetric standard model (MSSM), a light neutralino dark matter candidate has a lower bound on its mass of about 7 GeV. In light of this, we investigate the mass sensitivity at the ILC for very light neutralinos. We study slepton pair production, followed by the decay of the sleptons to a lepton and the lightest neutralino. We find that the mass measurement accuracy for a few-GeV neutralino is around 2 GeV, or even less if the relevant slepton is sufficiently light. We thus conclude that the ILC can help verify or falsify the MSSM neutralino cold dark matter model even for very light neutralinos.
Conley John A.
Dreiner Herbert K.
Wienemann Peter
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