轻型弱耦合轴向力：模型、约束和投影
Light Weakly Coupled Axial Forces: Models, Constraints, and Projections
摘要：
我们研究了MeV-GeV尺度上的约束景观，隐藏的U（1）力与非零轴矢量耦合到标准模型费米子。虽然纯矢量耦合的暗光子，这可能是由动力学混合，是一个很好的动机的情况下，几个兆电子伏尺度的异常激励与轴向耦合，可以紫外线完成符合标准模型规范不变性的理论。此外，暗光子的现有约束取决于轴向耦合和矢量耦合的各种组合的产物，使得难以隔离轴向耦合对特定风格的SM费米子的影响。我们提出了一个有代表性的可重正化，UV-完整的暗光子模型与可调的轴向和矢量耦合，讨论其一般功能，并显示一些UV约束可能会放松在一个模型与nonrenormalizable汤川耦合在微调的代价。我们综述了现有的参数空间和计划中实验的预计范围，简要地评论了允许的参数空间与π ^0和8-Be* 衰变中低能异常的相关性。
英文摘要：
We investigate the landscape of constraints on MeV-GeV scale, hidden U(1) forces with nonzero axial-vector couplings to Standard Model fermions. While the purely vector-coupled dark photon, which may arise from kinetic mixing, is a well-motivated scenario, several MeV-scale anomalies motivate a theory with axial couplings which can be UV-completed consistent with Standard Model gauge invariance. Moreover, existing constraints on dark photons depend on products of various combinations of axial and vector couplings, making it difficult to isolate the effects of axial couplings for particular flavors of SM fermions. We present a representative renormalizable, UV-complete model of a dark photon with adjustable axial and vector couplings, discuss its general features, and show how some UV constraints may be relaxed in a model with nonrenormalizable Yukawa couplings at the expense of fine-tuning. We survey the existing parameter space and the projected reach of planned experiments, briefly commenting on the relevance of the allowed parameter space to low-energy anomalies in pi^0 and 8-Be* decay.
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