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arXiv 1307.7802hep-ph
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利用直接暗物质探测约束331模型的Z'质量

Constraining the Z' Mass in 331 Models using Direct Dark Matter Detection

Stefano Profumo, Farinaldo S. Queiroz

摘要:

我们调查了一个所谓的331扩展标准模型的规范部门,其中容纳中微子质量和最轻的新的中性费米子在理论中是一个可行的粒子暗物质的候选人。在这个模型中,由额外的$Z^{\prime}$规范玻色子介导的过程设定了暗物质残留丰度和核的散射截面。我们计算了前所未有的准确性的暗物质遗迹密度,包括跨重费米子部门的共湮灭的重要影响,并表明,候选粒子确实有可能具有观察到的暗物质密度。我们发现,最近的LUX结果把非常严格的额外规范玻色子,$M_{Z^{\prime}} \gtrsim 2$ ~TeV,独立的暗物质质量的质量上的界限。我们还评论制度,我们的$Z^{\prime}$质量的界限可能适用于通用的331样模型,并对LHC现象学的影响。

英文摘要:

We investigate a so-called 331 extension of the Standard Model gauge sector which accommodates neutrino masses and where the lightest of the new neutral fermions in the theory is a viable particle dark matter candidate. In this model, processes mediated by the additional $Z^{\prime}$ gauge boson set both the dark matter relic abundance and the scattering cross section off of nuclei. We calculate with unprecedented accuracy the dark matter relic density, including the important effect of coannihilation across the heavy fermion sector, and show that indeed the candidate particle has the potential of having the observed dark matter density. We find that the recent LUX results put very stringent bounds on the mass of the extra gauge boson, $M_{Z^{\prime}} \gtrsim 2$~TeV, independently of the dark matter mass. We also comment on regime where our bounds on the $Z^{\prime}$ mass may apply to generic 331-like models, and on implications for LHC phenomenology.

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