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arXiv 1811.04095hep-phastro-ph.HE
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具有电磁形状因子的亮暗态

Light dark states with electromagnetic form factors

Xiaoyong Chu, Josef Pradler, Lukas Semmelrock

摘要:

新粒子$χ$是电中性的,但通过高维算子耦合到电磁流,并且足够轻,在GeV质量尺度或以下,可以在许多专门的高强度实验中成对产生。在这项工作中,我们认为生产的$χ$通过磁和电偶极矩,以及通过电子束中的Anapole矩和电荷半径的相互作用。我们从BaBar,NA 64和mQ中获得新的约束,并预测Belle-II,LDMX和BDX对这些状态存在的未来敏感性。我们首次提出了一个详细的处理的离壳生产的光子在电子束与随后的衰变成一个$χ\barχ$对在2至4的过程。这些直接的限制,然后比较SM精度可观的影响,以及从味物理和高能对撞机的界限。最后,我们考虑的可能性,$χ$是暗物质和研究随之而来的天体物理和宇宙学的约束。我们发现,所有考虑的探针排除$χ$粒子与质量维5和6光子相互作用的暗物质时,假设一个标准的冻结丰度。

英文摘要:

New particles $χ$ that are electrically neutral but couple to the electromagnetic current via higher-dimensional operators and that are sufficiently light, at or below the GeV-mass scale, can be produced in pairs in a number of dedicated high-intensity experiments. In this work we consider the production of $χ$ through magnetic- and electric-dipole moments as well as through anapole moment and charge radius interactions in electron beams. We derive new constraints from BaBar, NA64 and mQ and forecast the future sensitivity on the existence of such states, from Belle-II, LDMX and BDX. We present for the first time a detailed treatment of the off-shell production of photons in electron beams with subsequent decay into a $χ\barχ$ pair in a 2-to-4 process. These direct limits are then compared to the effects on SM precision observables, as well as to bounds from flavor physics and high energy colliders. Finally, we consider the possibility that $χ$ is dark matter and study ensuing astrophysical and cosmological constraints. We find that a combination of all considered probes rule out $χ$ particles with mass-dimension five and six photon interactions as dark matter when assuming a standard freeze-out abundance.

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