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arXiv 1909.06150hep-phhep-ex
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基于味变化中性电流的顶衰变的有效拉格朗日方法

Effective Lagrangian Approach to Top Decay via Flavor Changing Neutral Current

Zenro Hioki, Kazumasa Ohkuma, Akira Uejima

摘要:

我们研究了可能的非标准的$tuZ$和$tcZ$耦合,诱导口味改变中性流衰变的顶夸克,在有效拉格朗日框架。相应的相互作用拉格朗日量来自于几个$SU(3) \times SU(2) \times U(1)$不变的6维有效算符,它包含了四个独立的复数耦合常数。这些非标准的耦合常数在每个相互作用的约束,通过使用目前的实验限制的分支分数$t \to u Z$和$t \to c Z$过程。还讨论了未来设施的限制的预期改进。同时指出,这些约束耦合常数之间存在一定的相关性。

英文摘要:

We study possible non-standard $tuZ$ and $tcZ$ couplings, which induce flavor-changing neutral-current decays of the top quark, in the effective-Lagrangian framework. The corresponding interaction Lagrangian comes from several $SU(3) \times SU(2) \times U(1)$ invariant dimension-6 effective operators, and it includes four independent complex-number coupling constants. Constraints on those non-standard coupling constants in each interaction are derived by using the present experimental limits of the branching fractions for $t \to u Z$ and $t \to c Z$ processes. Expected improvements of the constraints at future facilities are discussed as well. It is also pointed out that some correlations hold among those constrained coupling constants.

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