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arXiv 2208.08142hep-ph
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电子对撞机上具有电磁形状因子的暗态

Dark states with electromagnetic form factors at electron colliders

Yu Zhang, Mao Song, Liangwen Chen

摘要:

电磁中性的暗扇区粒子可以通过更高维度的有效算子与光子微弱地相互作用,例如质量维5的磁和电偶极矩,以及质量维6的阿那极点矩和电荷半径算子。本文利用超荷规范场的形状因子来处理暗态,不仅引入电磁形状因子,而且引入相应的$Z$玻色子算符。以狄拉克费米子$χ$为例,研究了在当前和未来的$e^+e^-$对撞机实验(包括BESIII、STCF、Belle II和CEPC)中,通过光子搜索寻找这种暗态的探索.通过与现有实验的比较,我们发现BESIII、STCF、Belle II等质心在几个GeV的电子对撞机,对于质量维5的暗态小于几个GeV的算符,其相应的电磁形状因子具有领先的灵敏度,而对于质量维6的算符,它们不能提供有竞争力的电磁形状因子上限.未来的CEPC在$Z$ -玻色子质量上和质量之外运行,具有竞争性亮度,可以探测质量维5(6)算符在$m\lesssim 100 $ GeV(10 MeV $\lesssim m\lesssim 100 $ GeV)质量区域的暗态的未探索参数空间。

英文摘要:

Electromagnetically neutral dark sector particles may feebly interact with photons through higher dimensional effective operators, such as mass-dimension 5 magnetic and electric dipole moment, and a mass-dimension 6 anapole moment and charge radius operators. In this work, we use hypercharge gauge field form factors to treat dark states, which will induce not only electromagnetic form factors but also the corresponding $Z$ boson operators. Taking a Dirac fermion $χ$ as an example, we investigate the probes of searching for such dark states at current and future $e^+e^-$ collider experiments including BESIII, STCF, Belle II and CEPC via monophoton searches. Comparing to current experiments, we find that electron colliders including BESIII, STCF, Belle II, which operate with the center-of-mass at several GeV, have leading sensitivity on the corresponding electromagnetic form factors for the mass-dimension 5 operators with dark states lighter than several GeV, while they can not provide competitive upper limits for the mass-dimension 6 operators. Future CEPC operated with the center-of-mass on and beyond the mass of $Z$-boson with competitive luminosity can probe the unexplored parameter space for dark states with mass-dimension 5 (6) operators in the mass region of $m\lesssim 100 $ GeV (10 MeV $\lesssim m\lesssim 100 $ GeV).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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