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Spontaneous Electro-Weak Symmetry Breaking and Cold Dark Matter |
| ZHU Shou-Hua |
| Institute of Theoretical Physics, School of Physics, Peking University, Beijing 100871 |
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| Cite this article: |
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ZHU Shou-Hua 2007 Chin. Phys. Lett. 24 381-384 |
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Abstract In the standard model, the weak gauge bosons and fermions obtain mass after spontaneous electro-weak symmetry breaking, which is realized by one fundamental scalar field, namely the Higgs field. We study the simplest scalar cold dark matter model in which the scalar cold dark matter also obtains mass by interaction with the weak-doublet Higgs field, in the same way as those of weak gauge bosons and fermions. Our study shows that the correct cold dark matter relic abundance within 3σ uncertainty (0.093 <Ωdm h2 < 0.129) and experimentally allowed Higgs boson mass (114.4≤ mh ≤ 208GeV) constrain the scalar dark matter mass within 48≤e mS ≤78GeV. This result is in excellent agreement with the result of de Boer et al. (50～100GeV). Such a kind of dark matter annihilation can account for the observed gamma rays excess (10σ) at EGRET for nergies above 1GeV in comparison with the expectations from conventional Galactic models. We also investigate other phenomenological consequences of this model. For example, the Higgs boson decays dominantly into scalar cold dark matter if its mass lies within 48～64GeV.
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| Keywords:
14.80.-j
14.60.Fr
11.15.Ex
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Received: 24 November 2006
Published: 24 February 2007
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