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arXiv 1909.03383hep-ph
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通过实验数据约束的风味改变tqZ耦合的相关性

Correlations in flavor-changing tqZ couplings constrained via experimental data

Zenro Hioki, Kazumasa Ohkuma, Akira Uejima

摘要:

利用由几个SU(3)xSU(2)xU(1)不变维6算符组成的有效拉格朗日量,独立于模型地研究了可能的非标准tqZ耦合(其中q=c或u),它们起源于一般的变味中性流相互作用.电弱对称破缺后,这些算符重新组合成四类独立项,其系数一般为复数。因此,拉格朗日可以包括多达八个独立的耦合参数。通过寻找这些参数的实验允许区域,发现这些耦合的符号和大小之间存在一些相关性。

英文摘要:

Possible non-standard tqZ couplings, where q=c or u, originated from general flavor-changing-neutral-current interactions are studied model-independently using the effective Lagrangian consisting of several SU(3)xSU(2)xU(1) invariant dimension-6 operators. After the electroweak symmetry breaking, these operators are recombined to form four kinds of independent terms whose coefficients are complex in general. The Lagrangian could therefore include up to eight independent coupling parameters. Through searches for experimentally allowed regions of these parameters, it is found that some correlations exist among the signs and sizes of those couplings.

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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