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arXiv 1902.10340hep-ph
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CP破坏暗光子相互作用

CP-violating Dark Photon Interaction

Kaori Fuyuto, Xiao-Gang He, Gang Li, Michael Ramsey-Musolf

摘要:

我们介绍了一个方案的CP违反(CPV)暗光子相互作用的背景下,非阿贝尔动力学混合。假设一个有效场论,扩展了标准模型(SM)领域的内容与一个额外的$U(1)$规范玻色子($X$)和一个$SU(2)_L$三重标量,我们发现,存在CP守恒和CPV维5运营商涉及这些新的自由度和SM $SU(2)_L$规范玻色子。前者产生$X$和中性$SU(2)_L$规范玻色子之间的动力学混合(产生暗光子),而后者诱导暗光子与SM粒子的CPV相互作用。我们讨论了这些相互作用的实验探针,使用搜索永久电偶极矩(EDM)和双喷相关的高能$pp$碰撞。据发现,目前的实验限制的电子EDM给出了最强的限制CPV相互作用。原则上,高能$pp$碰撞通过矢量玻色子融合中两个前向标记喷流的方位角相关性提供互补探测。在实践中,观察相关的CPV不对称性可能具有挑战性。

英文摘要:

We introduce a scenario for CP-violating (CPV) dark photon interactions in the context of non-abelian kinetic mixing. Assuming an effective field theory that extends the Standard Model (SM) field content with an additional $U(1)$ gauge boson ($X$) and a $SU(2)_L$ triplet scalar, we show that there exist both CP-conserving and CPV dimension five operators involving these new degrees of freedom and the SM $SU(2)_L$ gauge bosons. The former yields kinetic mixing between the $X$ and the neutral $SU(2)_L$ gauge boson (yielding the dark photon), while the latter induces CPV interactions of the dark photon with the SM particles. We discuss experimental probes of these interactions using searches for permanent electric dipole moments (EDMs) and di-jet correlations in high-energy $pp$ collisions. It is found that the experimental limit on the electron EDM currently gives the strongest restriction on the CPV interaction. In principle, high energy $pp$ collisions provide a complementary probe through azimuthal angular correlations of the two forward tagging jets in vector boson fusion. In practice, observation of the associated CPV asymmetry is likely to be challenging.

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