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Anomaly of Zb(b)over-bar coupling revisited in MSSM and NMSSM
Cao, Junjie; Yang, Jin Min; Cao, JJ , Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada
2008
发表期刊JOURNAL OF HIGH ENERGY PHYSICS
ISSN1126-6708
期号12页码:-
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.
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
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
学科领域Physics
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收录类别SCI
WOS记录号WOS:000265578300006
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被引频次:25[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5434
专题理论物理所SCI论文
通讯作者Cao, JJ , Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada
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Cao, Junjie,Yang, Jin Min,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 Cao, Junjie,Yang, Jin Min,&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 Cao, Junjie,et al."Anomaly of Zb(b)over-bar coupling revisited in MSSM and NMSSM".JOURNAL OF HIGH ENERGY PHYSICS .12(2008):-.
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