Constraining Vectorlike Quark Model From B Radiative Decays

  • In the SU(2) singlet down type vectorlike quark model, there exist a tree level coupling zsb of b→sZ* and an additional D quark. In the framework we evaluate the D quark effects on B→Xsγ by running the Wilson coefficients of the effective Hamiltonian with the renormalization scale from mD to weak scale.Using the recent measurements for B→Xsl+l,we extract rather stringent constraints on the size and CP violating phase of zsb,and find that the zero point of the forward-backward asymmetry may have large deviation from that of the standard model and is very sensitive to zsb, and therefore, it can be useful in probing the new physics.
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XIONG Zhao-Hua. Constraining Vectorlike Quark Model From B Radiative Decays[J]. Chinese Physics C, 2006, 30(4): 284-288.
XIONG Zhao-Hua. Constraining Vectorlike Quark Model From B Radiative Decays[J]. Chinese Physics C, 2006, 30(4): 284-288. shu
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Received: 2005-08-15
Revised: 2005-10-26
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Constraining Vectorlike Quark Model From B Radiative Decays

    Corresponding author: XIONG Zhao-Hua,
  • Theoretical Physics Group, College of Applied Science, Beijing University of Technology, Beijing 100022, China

Abstract: In the SU(2) singlet down type vectorlike quark model, there exist a tree level coupling zsb of b→sZ* and an additional D quark. In the framework we evaluate the D quark effects on B→Xsγ by running the Wilson coefficients of the effective Hamiltonian with the renormalization scale from mD to weak scale.Using the recent measurements for B→Xsl+l,we extract rather stringent constraints on the size and CP violating phase of zsb,and find that the zero point of the forward-backward asymmetry may have large deviation from that of the standard model and is very sensitive to zsb, and therefore, it can be useful in probing the new physics.

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