ITP OpenIR  > 理论物理所科研产出  > SCI论文
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
Source PublicationJOURNAL OF HIGH ENERGY PHYSICS
KeywordSupersymmetric Standard Model Lightest Higgs-boson Electroweak Precision Data Probe Wmap Observations One-loop Corrections Radiative-corrections Realistic Approach Weinberg Model Z-resonance Z-decays
AbstractThe 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.
2008
ISSN1126-6708
Issue12Pages:-
Subject AreaPhysics
Indexed BySCI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5434
Collection理论物理所科研产出_SCI论文
Corresponding AuthorCao, JJ , Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada
Recommended Citation
GB/T 7714
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):-.
Files in This Item:
File Name/Size DocType Version Access License
Anomaly of Zb coupli(1172KB) 开放获取LicenseApplication Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Cao, Junjie]'s Articles
[Yang, Jin Min]'s Articles
[Cao, JJ , Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada]'s Articles
Baidu academic
Similar articles in Baidu academic
[Cao, Junjie]'s Articles
[Yang, Jin Min]'s Articles
[Cao, JJ , Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Cao, Junjie]'s Articles
[Yang, Jin Min]'s Articles
[Cao, JJ , Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.