重评破碎暗$U(1)$下的亮暗物质簇射
Light Dark Matter Showering under Broken Dark $U(1)$ -- Revisited
摘要：
最近有人提出，在破碎的暗U（1）规范群下，暗物质（DM）费米子的不同手征可以通过簇射模式在LHC上产生可区分的特征，这可能揭示暗扇区的质量起源。我们进一步研究这个问题，通过检查两个简化的模型，被称为手征模型和矢量模型的黑暗淋浴。我们推导出一组更完整的共线分裂函数的功率校正，指定的初始DM费米子的螺旋，并包括额外的自由度，黑暗的希格斯玻色子玻色子的贡献。然后，实现了这些分裂功能的黑暗淋浴，并强调了新的功能，从其正确的建模。结果表明，通过测量暗簇射斑图，特别是几乎与DM能量无关的DM喷注能量分布，可以区分DM费米子手征。
英文摘要：
It was proposed recently that different chiralities of the dark matter (DM) fermion under a broken dark U(1) gauge group can lead to distinguishable signatures at the LHC through shower patterns, which may reveal the mass origin of the dark sector. We study this subject further by examining the dark shower of two simplified models, the dubbed Chiral Model and the Vector Model. We derive a more complete set of collinear splitting functions with power corrections, specifying the helicities of the initial DM fermion and including the contribution from an extra degree of freedom, the dark Higgs boson. The dark shower is then implemented with these splitting functions, and the new features resulting from its correct modelling are emphasized. It is shown that the DM fermion chirality can be differentiated by measuring dark shower patterns, especially the DM jet energy profile, which is almost independent of the DM energy.
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