Target dark matter detection rates in models with a well-tempered neutralino

被引:54
作者
Baer, Howard
Mustafayev, Azar
Park, Eun-Kyung
Tata, Xerxes
机构
[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[2] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA
[3] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
[4] Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA
关键词
dark matter detectors; dark matter; cosmology of theories beyond the SM;
D O I
10.1088/1475-7516/2007/01/017
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In the post-LEP2 era, and in light of recent measurements of the cosmic abundance of cold dark matter (CDM) in the universe from WMAP, many supersymmetric models tend to predict (i) an overabundance of CDM and (ii) pessimistically low rates for direct detection of neutralino dark matter. However, in models with a 'well- tempered neutralino', where the neutralino composition is adjusted to give the measured abundance of CDM, the neutralino is typically of the mixed bino-wino or mixed bino-higgsino state. Along with the necessary enhancement to neutralino annihilation rates, these models tend to give elevated direct detection scattering rates compared to predictions from SUSY models with universal soft breaking terms. We present neutralino direct detection cross sections from a variety of models containing a well-tempered neutralino, and find cross section asymptotes with detectable scattering rates. These asymptotic rates provide targets that various direct CDM detection experiments should aim for. In contrast, in models where the neutralino mass rather than its composition is varied to give the WMAP relic density via either resonance annihilation or co-annihilation, the neutralino remains essentially bino-like, and direct detection rates may be below the projected reaches of all proposed experiments.
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页数:14
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