标题： CP破坏过程$γγ\to γγ$、$γZ$和$ZZ$的间接签名 显示英文标题

标题： Indirect Signatures of CP Violation in the Processes $γγ\to γγ$, $γZ$, and $ZZ$

摘要： 本文研究了过程$\gamma \gamma \to \gamma \gamma$、$\gamma Z$和$ZZ$在寻找超出计划未来对撞机生产阈值的能量尺度引起的 CP 破坏来源中的效用。 在有效拉格朗日方法的背景下，我们考虑了一组最普遍的 CP 奇异 SU(2)$\times$U(1) 算符，这些算符会产生可以在$2 \to 2$对撞机上的$\gamma \gamma $散射过程中探测到的真实四次规范玻色子耦合。 我们详细研究了每个过程，强调通过改变初始束流极化所获得的互补信息。 最后，我们将我们的结果与其他文献中关于 CP 奇异规范玻色子相互作用和四次规范玻色子耦合的约束进行了比较；这里得到的搜索范围通常更强，并且很好地补充了之前主要关注于$W$玻色子、顶夸克或希格斯产生情况的研究。 显示英文摘要

摘要： This paper studies the utility of the processes $\gamma \gamma \to \gamma \gamma$, $\gamma Z$, and $ZZ$ in searching for sources of CP violation arising from energy scales beyond the production thresholds of planned future colliders. In the context of an effective Lagrangian approach we consider the most general set of CP odd SU(2) $\times$ U(1) operators that give rise to genuinely quartic gauge boson couplings which can be probed in $2 \to 2$ scattering processes at a $\gamma \gamma $ collider. We study each process in detail, emphasizing the complementary information that is obtained by varying the initial beam polarizations. Finally, we compare our results to other constraints in the literature on CP odd gauge boson interactions and quartic gauge boson couplings; the search reaches obtained here are typically stronger and nicely complement previous studies which have focused primarily on $W$ boson, top quark, or Higgs production.