标题： 暗光子在宇称破坏的电子散射中 显示英文标题

标题： Dark photon in parity-violating electron scatterings

摘要： 我们提出，宇称破坏的电子散射（PVES）提供了一个强有力的工具来探测假设的暗光子。 我们计算了暗光子对PVES不对称性在弹性散射和深非弹性散射（DIS）中的贡献。 这些贡献由标准模型耦合项$C_{1q}, \, C_{2q}$和$C_{3q}$的修正特征化。 在低尺度下，如果存在暗光子，$C_{1q}$和$C_{3q}$的修正可能大至$5\%$。 在DIS（深非弹性散射）中，当涉及到HERA或EIC时，在非常高的$Q^2$情况下，暗光子可能对$C_{2q}$引起显著的修正，这表明提取价部分子分布函数存在高达$10\%$的不确定性。我们还通过拟合不对称性违例数据和CDF的$W$玻色子质量，提取了暗光子参数空间的有利区域，这些区域更倾向于一个质量高于$Z$玻色子质量的重暗光子。 显示英文摘要

摘要： We proposed that parity-violating electron scattering (PVES) offers a powerful tool to probe the hypothetical dark photon. We calculated the dark photon contributions to PVES asymmetries in both elastic and deep-inelastic scattering (DIS). These contributions are characterised by the corrections to the standard model couplings $C_{1q}, \, C_{2q}$, and $C_{3q}$. At low scales, the corrections to $C_{1q}$ and $C_{3q}$ could be as large as $5\%$ were a dark photon to exist. In DIS at very high $Q^2$, of relevance to HERA or the EIC, the dark photon could induce substantial corrections to $C_{2q}$, suggesting as large as $10\%$ uncertainties in the extraction of valence parton distribution functions. We also extracted the favoured regions of the dark photon parameter space by fitting the parity violation data and the CDF $W$ boson mass, which prefer a heavy dark photon with mass above the $Z$-boson mass.