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arXiv 0909.2034hep-ph
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古怪的复合暗物质

Quirky Composite Dark Matter

Graham D. Kribs, Tuhin S. Roy, John Terning, Kathryn M. Zurek

摘要:

我们提出了一个新的暗物质候选者,古怪的暗物质,这是一个新的非阿贝尔力的标量重子束缚态,变得强低于电弱标度。束缚态是由手征性奇异组成的:新的费米子在新的强力和电弱群的手征性表象下发生转变,从希格斯机制中获得质量。最轻重子的电荷中性要求近似简并的夸克质量,这也导致束缚态的电荷半径可以忽略不计。丰度是由一种不对称性决定的,这种不对称性通过电弱球重子与宇宙中的轻子数联系在一起。暗物质与原子核的弹性散射通过希格斯交换以及电磁极化率算子进行,该算子目前正在直接探测实验中进行测试。一种寻找奇特的暗物质的新方法是在星系团中寻找伽马射线暗线光谱特征,这些特征是由奇特的莱曼α或奇特的超精细跃迁产生的。对撞机预计将主要产生古怪的介子,而不是古怪的重子,因此大的丢失能量不是与古怪的暗物质相关的物理学的主要对撞机信号。

英文摘要:

We propose a new dark matter candidate, quirky dark matter, that is a scalar baryonic bound state of a new non-Abelian force that becomes strong below the electroweak scale. The bound state is made of chiral quirks: new fermions that transform under both the new strong force as well as in a chiral representation of the electroweak group, acquiring mass from the Higgs mechanism. Electric charge neutrality of the lightest baryon requires approximately degenerate quirk masses which also causes the charge radius of the bound state to be negligible. The abundance is determined by an asymmetry that is linked to the baryon and lepton numbers of the universe through electroweak sphalerons. Dark matter elastic scattering with nuclei proceeds through Higgs exchange as well as an electromagnetic polarizability operator which is just now being tested in direct detection experiments. A novel method to search for quirky dark matter is to look for a gamma-ray dark line spectroscopic feature in galaxy clusters that result from the quirky Lyman-alpha or quirky hyperfine transitions. Colliders are expected to dominantly produce quirky mesons, not quirky baryons, consequently large missing energy is not the primary collider signal of the physics associated with quirky dark matter.

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