Probing top-quark operators with precision electroweak measurements
文献类型：期刊论文
| 作者 | Liu, YM; Wang, YH; Zhang, C ; Zhang, L; Gu, JY
|
| 刊名 | CHINESE PHYSICS C
 |
| 出版日期 | 2022 |
| 卷号 | 46期号:11页码:113105 |
| ISSN号 | 1674-1137 |
| 关键词 | loop-induced processes effective field theory Monte Carlo generator top quark |
| DOI | 10.1088/1674-1137/ac82e1 |
| 文献子类 | Article |
| 英文摘要 | In the standard model effective field theory, operators involving the top quark are generally difficult to probe and can generate sizable loop contributions to electroweak precision observables measured by past and future lepton colliders. Could the high precision of electroweak measurements compensate for loop suppression and provide competitive reaches on these operators? Would the inclusion of these contributions introduce too many additional parameters for a meaningful global electroweak analysis to be performed? In this paper, we perform a detailed phenomenological study to address these two important questions. Focusing on eight dimension-6 operators that generate anomalous couplings between electroweak gauge bosons and third-generation quarks, we calculate their one loop contributions to e(+)e(-) -> f (f) over bar processes, both on and off the Z-pole, and the e(+)e(-) -> WW process. A global analysis is performed with these eight operators and those that contribute to the above processes at tree level using measurements at the LEP, SLC, and several low energy experiments. We find that although current electroweak precision measurements are sensitive to the one-loop effects of top-quark operators, it is difficult to separate them from the operators that contribute at tree level, making a global analysis rather challenging. Under further assumptions (for instance, new physics contributes to only third generation quark operators and the S and T parameters), competitive reaches may be obtained in a global fit. Another important finding of our study is that the two operators that generate the dipole interactions of the bottom quark have a significant impact on the Z-pole measurements and should not be omitted. We also discuss the implications of the recently reported W-boson mass measurement at the CDF for our results. Finally, we estimate the reaches of future lepton colliders in probing top-quark operators with precision electroweak measurements. |
| 电子版国际标准刊号 | 2058-6132 |
| 语种 | 英语 |
| WOS记录号 | WOS:000874216000001 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/299407]  |
| 专题 | 高能物理研究所_理论物理室 高能物理研究所_加速器中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Liu, YM,Wang, YH,Zhang, C,et al. Probing top-quark operators with precision electroweak measurements[J]. CHINESE PHYSICS C,2022,46(11):113105. |
| APA | Liu, YM,Wang, YH,Zhang, C,Zhang, L,&Gu, JY.(2022).Probing top-quark operators with precision electroweak measurements.CHINESE PHYSICS C,46(11),113105. |
| MLA | Liu, YM,et al."Probing top-quark operators with precision electroweak measurements".CHINESE PHYSICS C 46.11(2022):113105. |
入库方式： OAI收割
来源：高能物理研究所
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