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arXiv 1809.01389hep-phhep-ex
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研究变味中性tqZ偶合物:当前的限制和未来的展望

Studying flavor-changing neutral tqZ couplings: Current constraints and future prospects

Zenro Hioki, Kazumasa Ohkuma, Akira Uejima

摘要:

在有效拉格朗日框架下,研究了可能的非标准tuZ和tcZ相互作用,这些相互作用引起顶夸克的中性流衰变。相应的拉格朗日量由SU(3)xSU(2)xU(1)六维不变有效算符的四种非标准耦合组成。每个相互作用中的四个耦合常数被处理为相互独立的复数,并利用目前t -> uZ和t -> cZ过程分支分数的实验极限导出了对它们的约束条件。这些约束的未来改进也进行了讨论,以及在高亮度大型强子对撞机测量这些耦合的可能性。

英文摘要:

Possible non-standard tuZ and tcZ interactions, which induce flavor-changing neutral-current decays of the top quark, are studied in the effective-Lagrangian framework. The corresponding Lagrangian consists of four kinds of non-standard couplings coming from SU(3)xSU(2)xU(1) invariant dimension-6 effective operators. The four coupling constants in each interaction are treated as complex numbers independent of each other, and constraints on them are derived by using the present experimental limits of the branching fractions for t -> u Z and t -> c Z processes. Future improvements of those constraints are also discussed as well as possibilities of measurements of these couplings at the High-Luminosity Large Hadron Collider.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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