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Large Dimuon Asymmetry and a Non-Universal <em>Z<sup>′</sup></em> Boson in the <em> B<sub>s</sub>−<span style="border-top: 1px solid; padding-top: 0px;">B</span><sub>s</sub></em> System
Large Dimuon Asymmetry and a Non-Universal Z′ Boson in the Bs−Bs 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
Large Dimuon Asymmetry and a Non-Universal Z′ Boson in the Bs−Bs 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
摘要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 Bs−Bs 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.
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 Bs−Bs 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.
CHANG Qin;WANG Ru-Min;XU Yuan-Guo;CUI Xiao-Wei
. Large Dimuon Asymmetry and a Non-Universal Z′ Boson in the Bs−Bs System[J]. 中国物理快报, 2011, 28(8): 81301-081301.
CHANG Qin, WANG Ru-Min, XU Yuan-Guo, CUI Xiao-Wei
. Large Dimuon Asymmetry and a Non-Universal Z′ Boson in the Bs−Bs System. Chin. Phys. Lett., 2011, 28(8): 81301-081301.
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