ADMonium: Asymmetric Dark Matter Bound State

分类： 物理学 >> 核物理学 提交时间： 2016-08-31

Xiao-Jun Bi Zhaofeng Kang P. Ko Jinmian Li Tianjun L

摘要： We propose a novel framework for asymmetric scalar dark matter (ADM), which has interesting collider phenomenology in terms of an unstable ADM bound state (ADMonium) produced via Higgs portals. ADMonium is a natural consequence of the basic features of ADM: the (complex scalar) ADM is charged under a dark local U(1)d symmetry which is broken at a low scale and provides a light gauge boson X. The dark gauge coupling is strong and then ADM can annihilate away into X-pair effectively. Therefore, the ADM can form bound state due to its large self-interaction via X mediation. To explore the collider signature of ADMonium, we propose that ADM has a two-Higgs doublet portal. The ADMonium can have a sizable mixing with the heavier Higgs boson, which admits a large cross section of ADMonium production associated with bb¯. Of particular interest, our setup nicely explains the recent di-photon anomaly at 750 GeV via the events from ${\rm ADMonium}\ra 2X(\ra e^+e^-)$, where the electrons are identified as (un)converted photons. The remarkable prediction of an ADM near 375 GeV can be tested at the direct detection experiments in the near future.

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