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arXiv 1204.2808hep-phastro-ph.CO
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复合标量暗物质

Composite Scalar Dark Matter

Michele Frigerio, Alex Pomarol, Francesco Riva, Alfredo Urbano

摘要:

我们发现,暗物质(DM)可能是一个轻的复合标量$η$,出现在一个TeV尺度的强耦合部门作为一个伪南武-戈德斯通玻色子(pNGB)。这种状态在希格斯粒子也是复合pNGB的情况下自然出现,就像在$O(6)/O(5)$模型中一样,这种模型特别具有预测性,因为$η$的低能相互作用是由对称性考虑决定的。我们确定区域的参数,其中$η$具有所需的DM遗物密度,满足在同一时间的限制,从希格斯粒子搜索在大型强子对撞机,以及DM直接搜索。复合,除了证明标量的亮度,可以提高DM散射率,并导致一个很好的发现前景,在不久的将来。对于一个希格斯质量$m_h\simeq 125$ GeV和pNGB特征尺度$f \lesssim 1$ TeV,我们发现,DM质量是$m_η\simeq 50-70$ GeV,与DM湮灭驱动的希格斯共振,或在100-500 GeV的范围内,DM衍生物与希格斯相互作用成为主导。在前一种情况下,不可见的希格斯衰变为两个DM粒子可能会削弱LHC希格斯信号。

英文摘要:

We show that the dark matter (DM) could be a light composite scalar $η$, emerging from a TeV-scale strongly-coupled sector as a pseudo Nambu-Goldstone boson (pNGB). Such state arises naturally in scenarios where the Higgs is also a composite pNGB, as in $O(6)/O(5)$ models, which are particularly predictive, since the low-energy interactions of $η$ are determined by symmetry considerations. We identify the region of parameters where $η$ has the required DM relic density, satisfying at the same time the constraints from Higgs searches at the LHC, as well as DM direct searches. Compositeness, in addition to justify the lightness of the scalars, can enhance the DM scattering rates and lead to an excellent discovery prospect for the near future. For a Higgs mass $m_h\simeq 125$ GeV and a pNGB characteristic scale $f \lesssim 1$ TeV, we find that the DM mass is either $m_η\simeq 50-70$ GeV, with DM annihilations driven by the Higgs resonance, or in the range 100-500 GeV, where the DM derivative interaction with the Higgs becomes dominant. In the former case the invisible Higgs decay to two DM particles could weaken the LHC Higgs signal.

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