Prospects for Higgs- and Z-resonant Neutralino Dark Matter

Abstract

In the minimal supersymmetric standard models, neutralino dark matter with mass of $m_{\chi }\sim m_Z/2\sim 45$ GeV and $m_{\chi }\sim m_h/2\sim 62$ GeV can have the thermal relic abundance ${\Omega }_{{\chi }_1}{h}^2\simeq 0.120$ via the $Z$- and Higgs-resonant annihilations, respectively, while avoiding all the current constraints. Phenomenology of such scenarios is determined only by three parameters, Bino mass $M_1$, Higgsino mass $\mu$, and $\tan \beta$, in the limit that all other supersymmetric particles and heavy Higgs bosons are decoupled. In this paper, we comprehensively study the constraints and future prospects of the search for such Higgs- and $Z$-resonant neutralino dark matter. It is shown that almost all the parameter space of the scenario will be probed complementarily by the LHC search for the chargino and neutralinos, the direct detection experiments, and the Higgs invisible decay search at the ILC.

30 pages, 29 figures

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