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CP asymmetry in \(B \rightarrow \phi K_{S}\) in a general two-Higgs-doublet model with fourth-generation quarks

  • Y.-L. WuEmail author
  • Y.-F. Zhou
theoretical physics

Abstract.

We discuss the time-dependent CP asymmetry of the decay \(B \rightarrow \phi K_{\mathrm {S}}\) in an extension of the standard model with both a two Higgs doublet and additional fourth-generation quarks. We show that, although the standard model with a two Higgs doublet and the standard model with fourth-generation quarks alone are not likely to largely change the effective \(\sin 2 \beta\) from the decay \(B \rightarrow \phi K_{\mathrm {S}}\), the model with both an additional Higgs doublet and fourth-generation quarks can easily account for the possible large negative value of \(\sin 2 \beta\) without conflicting with other experimental constraints. In this model, additional large CP violating effects may arise from the flavor-changing Yukawa interactions between neutral Higgs bosons and the heavy fourth-generation down type quark, which can modify the QCD penguin contributions. With the constraints obtained from \(b \rightarrow s \bar{s} s\) processes such as \(B \rightarrow X_{s} \gamma\) and \(\Delta m_{B_{s}^{0}}\), this model can lead to an effective \(\sin 2 \beta\) as large as - 0.4 in the CP asymmetry of \({B \rightarrow \phi K_{\mathrm {S}}}\).

Keywords

Higgs Boson Higgs Doublet Experimental Constraint Yukawa Interaction Neutral Higgs Boson 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin/Heidelberg 2004

Authors and Affiliations

  1. 1.Institute of Theoretical PhysicsChinese Academy of SciencesBeijngP.R. China
  2. 2.Institute for PhysicsDortmund UniversityDortmundGermany

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