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题名: Anomaly of Zb(b)over-bar coupling revisited in MSSM and NMSSM
作者: Cao, Junjie ;  Yang, Jin Min
刊名: JOURNAL OF HIGH ENERGY PHYSICS
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
学科分类: Physics
通讯作者: Cao, JJ , Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada
部门归属: [Cao, JJ] Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada; [Yang, JM] Acad Sinica, Inst Theoret Phys, Beijing 100190, Peoples R China; [Yang, JM] Acad Sinica, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000265578300006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5434
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Cao, Junjie,Yang, Jin Min. Anomaly of Zb(b)over-bar coupling revisited in MSSM and NMSSM[J]. JOURNAL OF HIGH ENERGY PHYSICS,2008(12):-.
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