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arXiv 0901.1437hep-phhep-ex
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nMSSM的实验约束及其唯象学意义

Experimental constraints on nMSSM and implications on its phenomenology

Junjie Cao, Heather E. Logan, Jin Min Yang

摘要:

我们研究了几乎最小超对称标准模型(nMSSM)的各种直接和间接实验约束,并获得了以下观察结果:(i)目前的实验严格限制了参数空间,将最轻的中性伴子的能量范围定为1-37 GeV,30-140 GeV最轻的CP偶(CP奇)希格斯玻色子为1-250 GeV,\tan β为1.5-10 GeV;(ii)为了解释暗物质遗迹密度,除了Z玻色子的s通道交换,轻A_1(最轻的CP奇希格斯玻色子玻色子)的s-通道交换也可以在LSP湮灭中起重要作用。与Z-交换湮灭通道相比,A_1交换湮灭通道更有利于μ介子g-2的测量,并且允许的参数区域更宽;(iii)在所允许的参数空间中,类SM希格斯玻色子主要衰变为LSP对或A_1对,而常规的可见衰变(如底夸克)受到严重抑制.

英文摘要:

We examine various direct and indirect experimental constraints on the nearly minimal supersymmetric standard model (nMSSM) and obtain the following observations: (i) Current experiments stringently constrain the parameter space, setting a range of 1-37 GeV for the lightest neutralino (LSP), 30-140 GeV (1-250 GeV) for the lightest CP-even (CP-odd) Higgs boson, and 1.5-10 for \tanβ; (ii) To account for the dark matter relic density, besides the s-channel exchange of a Z-boson, the s-channel exchange of a light A_1 (the lightest CP-odd Higgs boson) can also play an important role in LSP annihilation. Compared with the Z-exchange annihilation channel, the A_1 exchange channel is more favored by muon g-2 data and allows much broader regions for the parameters; (iii) In a large part of the allowed parameter space the SM-like Higgs boson may dominantly decay to LSP pair or A_1 pair and the conventional visible decays (e.g. into bottom quarks) are severely suppressed.

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