Chinese Physics C > 2006, Vol. 30 > Issue(4): 284-288

Constraining Vectorlike Quark Model From B Radiative Decays

XIONG Zhao-Hua^,

Theoretical Physics Group, College of Applied Science, Beijing University of Technology, Beijing 100022, China

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Abstract：
In the SU(2) singlet down type vectorlike quark model, there exist a tree level coupling z _sbof b→sZ ^*and an additional D quark. In the framework we evaluate the D quark effects on B→X _sγ by running the Wilson coefficients of the effective Hamiltonian with the renormalization scale from m _Dto weak scale.Using the recent measurements for B→X _sl ⁺l ^－,we extract rather stringent constraints on the size and CP violating phase of z _sb,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 z _sb, and therefore, it can be useful in probing the new physics.

References

[1]

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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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沈阳化工大学材料科学与工程学院沈阳 110142

Constraining Vectorlike Quark Model From B Radiative Decays

XIONG Zhao-Hua^,

Corresponding author:XIONG Zhao-Hua,

Theoretical Physics Group, College of Applied Science, Beijing University of Technology, Beijing 100022, China

Received Date:2005-08-15
Accepted Date:2005-10-26
Available Online:2006-04-05

Abstract:In the SU(2) singlet down type vectorlike quark model, there exist a tree level coupling z_sbof b→sZ^*and an additional D quark. In the framework we evaluate the D quark effects on B→X_sγ by running the Wilson coefficients of the effective Hamiltonian with the renormalization scale from m_Dto weak scale.Using the recent measurements for B→X_sl⁺l^－,we extract rather stringent constraints on the size and CP violating phase of z_sb,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 z_sb, and therefore, it can be useful in probing the new physics.