Global fit of modified quark couplings to EW gauge bosons and vector-like quarks in light of the Cabibbo angle anomaly
文献类型：期刊论文
| 作者 | Crivellin, Andreas1; Kirk, Matthew2; Kitahara, Teppei3,4,5; Mescia, Federico2 |
| 刊名 | JOURNAL OF HIGH ENERGY PHYSICS
 |
| 出版日期 | 2023 |
| 期号 | 3页码:234 |
| ISSN号 | 1029-8479 |
| 关键词 | US-VERTICAL-BAR PHYSICS |
| DOI | 10.1007/JHEP03(2023)234 |
| 英文摘要 | There are two tensions related to the Cabibbo angle of the CKM matrix. First, the determinations of V-us from K-mu 2, K-l3, and tau decays disagree at the 3 sigma level. Second, using the average of these results in combination with beta decays (including super-allowed beta decays and neutron decay), a deficit in first-row CKM unitarity with a significance of again about 3 sigma is found. These discrepancies, known as the Cabibbo Angle anomaly, can in principle be solved by modifications of W boson couplings to quarks. However, due to SU(2)(L) invariance, Z couplings to quarks are also modified and flavour changing neutral currents can occur. In order to consistently assess the agreement of a new physics hypothesis with data, we perform a combined analysis for all dimension-six Standard Model Effective Field Theory operators that generate modified W couplings to first and second generation quarks. We then study models with vector-like quarks, which are prime candidates for a corresponding UV completion as they can affect W -quark couplings at tree level, and we perform a global fit including flavour observables (in particular loop effects in increment F = 2 processes). We find that the best fit can be obtained for the SU(2)(L) doublet vector-like quark Q as it can generate right-handed W-u-d and W-u-s couplings as preferred by data. |
| 学科主题 | Physics |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/27985]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 作者单位 | 1.Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland 2.Paul Scherrer Inst, CH-5232 Villigen, Switzerland 3.Univ Barcelona UB, Inst Ciencies Cosmos ICCUB, Dept Fis Quant & Astrofis FQA, Barcelona, Spain 4.Nagoya Univ, IAR & KMI, Nagoya 4648602, Japan 5.KEK Theory Ctr, IPNS, KEK, Tsukuba 3050801, Japan 6.Chinese Acad Sci, CAS Key Lab Theoret Phys, ITP, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Crivellin, Andreas,Kirk, Matthew,Kitahara, Teppei,et al. Global fit of modified quark couplings to EW gauge bosons and vector-like quarks in light of the Cabibbo angle anomaly[J]. JOURNAL OF HIGH ENERGY PHYSICS,2023(3):234. |
| APA | Crivellin, Andreas,Kirk, Matthew,Kitahara, Teppei,&Mescia, Federico.(2023).Global fit of modified quark couplings to EW gauge bosons and vector-like quarks in light of the Cabibbo angle anomaly.JOURNAL OF HIGH ENERGY PHYSICS(3),234. |
| MLA | Crivellin, Andreas,et al."Global fit of modified quark couplings to EW gauge bosons and vector-like quarks in light of the Cabibbo angle anomaly".JOURNAL OF HIGH ENERGY PHYSICS .3(2023):234. |
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来源：理论物理研究所
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