arXiv 2007.049272020-07-09hep-phnucl-th

核物理中的强CP破坏

Strong CP violation in nuclear physics

Jordy de Vries, Alex Gnech, Sachin Shain

发表信息：: Phys. Rev. C 103, 012501 (2021)
DOI：: 10.1103/PhysRevC.103.L012501

摘要：

核、抗磁原子和某些分子的电偶极矩是由CP破坏的核力引起的。朴素的量纲分析预测这些力将由长程的一π介子交换过程所主导，而短程的力只在手征膨胀中以次-主导的顺序进入。基于重整化参数，我们认为，一个一致的图片CP违反核力需要一个领先的顺序短距离运营商有助于${}^1S_0$ - ${}^3P_0$过渡，由于在${}^3P_0$通道的强张量力的吸引力和奇异性。短距离运营商导致$\mathcal O(1)$纠正静态和振荡，相关的轴子搜索，电偶极矩。我们讨论的策略，如何有限的一部分，相关的低能常数可以确定的情况下，CP破坏从QCD θ项的连接到核系统中的电荷对称性破坏。

英文摘要：

Electric dipole moments of nuclei, diamagnetic atoms, and certain molecules are induced by CP-violating nuclear forces. Naive dimensional analysis predicts these forces to be dominated by long-range one-pion-exchange processes, with short-range forces entering only at next-to-next-to-leading order in the chiral expansion. Based on renormalization arguments we argue that a consistent picture of CP-violating nuclear forces requires a leading-order short-distance operator contributing to ${}^1S_0$-${}^3P_0$ transitions, due to the attractive and singular nature of the strong tensor force in the ${}^3P_0$ channel. The short-distance operator leads to $\mathcal O(1)$ corrections to static and oscillating, relevant for axion searches, electric dipole moments. We discuss strategies how the finite part of the associated low-energy constant can be determined in the case of CP violation from the QCD theta term by the connection to charge-symmetry violation in nuclear systems.

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