2HDM中的CP相和有效势：几何观点
CP Phases in 2HDM and Effective Potential: A Geometrical View
摘要：
利用2HDM的几何描述，我们将CP不变量分为三个独立的部分，如标量势，汤川相互作用和CKM矩阵。用基不变方法计算了2HDM的热有效势。结果表明，Yukawa相互作用中的CP破坏可以在一个回路水平上对有效势作出贡献，但CKM矩阵中的CP相在所有的阶数下都不能泄漏到有效势中.在Z_2对称性软破缺的2HDM中，主导热修正倾向于在高温下恢复CP对称性。
英文摘要：
Using a geometric description of 2HDM, we classify CP invariants into three independent sectors such as scalar potential, Yukawa interaction and CKM matrix. Thermal effective potential of 2HDM is calculated in a basis invariant way. It is shown that the CP violation in Yukawa interactions can contribute to effective potential at one loop level but the CP phase in the CKM matrix cannot leak to effective potential at all orders. In the 2HDM with a softly broken Z_2 symmetry, the leading thermal correction tends to restore the CP symmetry at high temperature.
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