Anomaly of Zb(b)over-bar coupling revisited in MSSM and NMSSM
文献类型：期刊论文
| 作者 | Yang, Jin Min; Cao, Junjie; Cao, JJ , Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada |
| 刊名 | JOURNAL OF HIGH ENERGY PHYSICS
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| 出版日期 | 2008 |
| 期号 | 12页码:- |
| 关键词 | Supersymmetric Standard Model Lightest Higgs-boson Electroweak Precision Data Probe Wmap Observations One-loop Corrections Radiative-corrections Realistic Approach Weinberg Model Z-resonance Z-decays |
| ISSN号 | 1126-6708 |
| 英文摘要 | The Zb (b) over bar coupling determined from the Z-pole measurements at LEP/SLD shows an about 3 sigma deviation from the SM prediction, which would signal the presence of new physics in association with the Zb (b) over bar coupling. In this work we give a comprehensive study for the full one-loop supersymmetric effects on the Zb (b) over bar coupling in both the MSSM and the NMSSM by considering all current constraints which are from the precision electroweak measurements, the direct search for sparticles and Higgs bosons, the stability of Higgs potential, the dark matter relic density, and the muon g - 2 measurement. We analyze the characters of each type of the corrections and search for the SUSY parameter regions where the corrections could be sizable. We find that the sizable corrections may come from the Higgs sector with light m(A) and large tan beta, which can reach -2% and -6% for rho(b) and sin(2)theta(b)(eff), respectively. However, such sizable negative corrections are just opposite to what needed to solve the anomaly. We also scan over the allowed parameter space and investigate to what extent supersymmetry can narrow the discrepancy. We find that under all current constraints, the supersymmetric effects are quite restrained and cannot significantly ameliorate the anomaly of Zb (b) over bar coupling. Compared with chi(2)/dof = 9.62/2 in the SM, the MSSM and NMSSM can only improve it to chi(2)/dof = 8.77/2 in the allowed parameter space. Therefore, if the anomaly of Zb (b) over bar coupling is not a statistical or systematic problem, it would suggest new physics beyond the MSSM or NMSSM. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000265578300006 |
| 公开日期 | 2012-08-02 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/5434]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 通讯作者 | Cao, JJ , Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada |
| 推荐引用方式 GB/T 7714 | Yang, Jin Min,Cao, Junjie,Cao, JJ , Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada. Anomaly of Zb(b)over-bar coupling revisited in MSSM and NMSSM[J]. JOURNAL OF HIGH ENERGY PHYSICS,2008(12):-. |
| APA | Yang, Jin Min,Cao, Junjie,&Cao, JJ , Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada.(2008).Anomaly of Zb(b)over-bar coupling revisited in MSSM and NMSSM.JOURNAL OF HIGH ENERGY PHYSICS(12),-. |
| MLA | Yang, Jin Min,et al."Anomaly of Zb(b)over-bar coupling revisited in MSSM and NMSSM".JOURNAL OF HIGH ENERGY PHYSICS .12(2008):-. |
入库方式： OAI收割
来源：理论物理研究所
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