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arXiv 2004.04036hep-phhep-ex
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强CP破坏:问题还是祝福?

Strong CP violation: problem or blessing?

Goran Senjanovic, Vladimir Tello

摘要:

我们重新讨论了在标准模型和最小左右对称模型中的强CP破坏问题,并试图澄清似乎仍然弥漫在该领域的混乱。我们认为,小的强CP破坏,而无害的,基本上从SM中的其余物理解耦,在LR对称性的背景下提供了一个祝福,帮助缩小参数空间的理论和连接明显不相关的物理量。特别是,在左右对称性是宇称的情况下,它要么指向之前注意到的轻子CP破坏的抑制,要么它导致相对较轻的右手中微子,可能在下一个强子对撞机上获得。后者,从复杂的夸克汤川耦合的角度来看,更自然,与轻子味破坏的小性密切相关,并增强了观察无中微子双β衰变的可能性。

英文摘要:

We readdress the issue of strong CP violation both in the Standard Model and in the Minimal Left-Right Symmetric Model and try to clear the confusion that seems to still pervade the field. We argue that the smallness of strong CP violation, while harmless and basically decoupled from the rest of physics in the SM, in the context of LR symmetry provides a blessing by helping to narrow down the parameter space of the theory and connecting apparently uncorrelated physical quantities. In particular, in the context of left-right symmetry being parity, it either points to the suppression of leptonic CP violation noticed before, or it leads to relatively light right-handed neutrinos, potentially accessible at the next hadron collider. The latter, more natural in view of complex quark Yukawa couplings, goes hand in hand with the smallness of lepton flavor violation and enhances the possibility of observing neutrinoless double beta decay.

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