论文标题
尼尔森 - 巴尔类型的矢量夸克的后果
Consequences of vector-like quarks of Nelson-Barr type
论文作者
论文摘要
解决强CP问题的尼尔森 - 巴尔龙机制需要类似矢量的夸克（VLQ）将自发的CP传输到SM。我们研究只有这些VLQ在TEV量表上仅能的情况，而自发的CP破坏部门是无法访问的。我们研究了尼尔森 - 巴尔类型的这些VLQ与通用VLQ的不同，并从参数计数中发现需要一个较少的参数。特别是，对于一种尼尔森 - 巴尔类型的VLQ，只有一个CP奇数构成了所有CP违规的原因。在这种情况下，我们解决了仅参数化新物理参数的技术问题，同时将SM参数保留为独立输入。对于一种廉价的VLQ，该型号在很大程度上是安全的，因为VLQ耦合到SM Quarks，而$ W $的VLQ耦合在较轻的夸克中较小。
The Nelson-Barr mechanism to solve the strong CP problem requires vector-like quarks (VLQs) to transmit the spontaneous CP breaking to the SM. We study the scenario where only these VLQs are within reach at the TeV scale while the spontaneous CP breaking sector is inaccessible. We investigate how these VLQs of Nelson-Barr type differ from generic VLQs and find from parameter counting that one less parameter is needed. In particular, for one VLQ of Nelson-Barr type, there is only one CP odd quantity that is responsible for all CP violation. In this case, we solve the technical problem of parametrizing only the new physics parameters while keeping the SM parameters as independent inputs. For one down-type VLQ, the model is largely flavor safe because the VLQ couplings to the SM up quarks and the $W$ are hierarchically smaller for lighter quarks.
