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Chin. Phys. Lett.  2011, Vol. 28 Issue (8): 081301    DOI: 10.1088/0256-307X/28/8/081301
THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
Large Dimuon Asymmetry and a Non-Universal Z Boson in the BsBs System
CHANG Qin1,2, WANG Ru-Min3, XU Yuan-Guo3, CUI Xiao-Wei1
1Department of Physics, Henan Normal University, Xinxiang 453007
2Institute of Particle Physics, Huazhong Normal University, Wuhan 430079
3College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000
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CHANG Qin, WANG Ru-Min, XU Yuan-Guo et al  2011 Chin. Phys. Lett. 28 081301
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Abstract Motivated by recently observed anomalously large dimuon charge asymmetry in neutral B decays reported by the D0 collaboration, we study the effects of a family of non-universal Z bosons for possible solutions. The fitting results for the Z parameters are presented under the constraints from the D0 result for asls and UTfit results for CBs and φBs in two limiting scenarios for left− and right-handed b-s-Z couplings. We find the couplings BsbL and BsbR are rigorously bounded but not excluded, which means that the anomalies in the BsBs system could be moderated simultaneously within a non-universal Z model. Numerically, a new weak phase φLs ∼−60° (80°) in scenario I or 30°(10°) in scenario II is crucial to moderate the large dimuon charge asymmetry.
Keywords: 13.25.Hw      12.60.Cn      12.15.Mm      11.30.Hv.     
Received: 16 May 2011      Published: 28 July 2011
PACS:  13.25.Hw (Decays of bottom mesons)  
  12.60.Cn (Extensions of electroweak gauge sector)  
  12.15.Mm (Neutral currents)  
  11.30.Hv.  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/28/8/081301       OR      https://cpl.iphy.ac.cn/Y2011/V28/I8/081301
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CHANG Qin
WANG Ru-Min
XU Yuan-Guo
CUI Xiao-Wei
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