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arXiv 1407.2623hep-ph
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暗粒子与光介质的散射

Scattering of Dark Particles with Light Mediators

Davison E. Soper, Michael Spannowsky, Tim M. P. Tait, Chris J. Wallace

摘要:

我们提出了一种治疗的高能量散射的暗狄拉克费米子从核,介导的交换的光矢量玻色子。暗费米子是由固定靶中的质子-核相互作用产生的,在穿过屏蔽层筛选出强相互作用产物后,看起来类似于探测器中的中微子中性流散射。以费米实验室E613实验为例,我们对一个隐蔽的暗物质场景进行了限制。在探测器中的可见光散射既包括熟悉的制度的大动量转移到原子核($Q^2$)所描述的深度非弹性散射,以及小$Q^2$运动学所描述的交换矢量介质波动成一个夸克-反夸克对,其与原子核的相互作用是由饱和模型。我们发现,低$Q^2$散射的改进的描述导致重要的修正,导致更强大的约束,在一个政权的描述完全在深非弹性散射不能信任。

英文摘要:

We present a treatment of the high energy scattering of dark Dirac fermions from nuclei, mediated by the exchange of a light vector boson. The dark fermions are produced by proton-nucleus interactions in a fixed target and, after traversing shielding that screens out strongly interacting products, appear similarly to neutrino neutral current scattering in a detector. Using the Fermilab experiment E613 as an example, we place limits on a secluded dark matter scenario. Visible scattering in the detector includes both the familiar regime of large momentum transfer to the nucleus ($Q^2$) described by deeply inelastic scattering, as well as small $Q^2$ kinematics described by the exchanged vector mediator fluctuating into a quark-antiquark pair whose interaction with the nucleus is described by a saturation model. We find that the improved description of the low $Q^2$ scattering leads to important corrections, resulting in more robust constraints in a regime where a description entirely in terms of deeply inelastic scattering cannot be trusted.

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