General scan in flavor parameter space in models with vector quark doublets and an enhancement in the B→Xsγ process

  • In models with vector-like quark doublets, the mass matrices of up and down type quarks are related. Precise diagonalization of the mass matrices has become an obstacle in numerical studies. In this work we first propose a diagonalization method. As its application, in the Standard Model with one vector-like quark doublet we present the quark mass spectrum and Feynman rules for the calculation of B→Xsγ. We find that i) under the constraints of the CKM matrix measurements, the mass parameters in the bilinear term are constrained to a small value by the small deviation from unitarity; ii) compared with the fourth generation extension of the Standard Model, there is an enhancement to the B→Xsγ process in the contribution of vector-like quarks, resulting in a non-decoupling effect in such models.
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Wenyu Wang, Zhao-Hua Xiong and Xin-Yan Zhao. General scan in flavor parameter space in models with vector quark doublets and an enhancement in the B→Xsγ process[J]. Chinese Physics C, 2016, 40(9): 093102. doi: 10.1088/1674-1137/40/9/093102
Wenyu Wang, Zhao-Hua Xiong and Xin-Yan Zhao. General scan in flavor parameter space in models with vector quark doublets and an enhancement in the B→Xsγ process[J]. Chinese Physics C, 2016, 40(9): 093102.  doi: 10.1088/1674-1137/40/9/093102 shu
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Received: 2016-03-30
Revised: 2016-05-13
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    Supported by Natural Science Foundation of China (11375001) and Talents Foundation of Education Department of Beijing

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General scan in flavor parameter space in models with vector quark doublets and an enhancement in the B→Xsγ process

    Corresponding author: Wenyu Wang,
    Corresponding author: Zhao-Hua Xiong,
    Corresponding author: Xin-Yan Zhao,
Fund Project:  Supported by Natural Science Foundation of China (11375001) and Talents Foundation of Education Department of Beijing

Abstract: In models with vector-like quark doublets, the mass matrices of up and down type quarks are related. Precise diagonalization of the mass matrices has become an obstacle in numerical studies. In this work we first propose a diagonalization method. As its application, in the Standard Model with one vector-like quark doublet we present the quark mass spectrum and Feynman rules for the calculation of B→Xsγ. We find that i) under the constraints of the CKM matrix measurements, the mass parameters in the bilinear term are constrained to a small value by the small deviation from unitarity; ii) compared with the fourth generation extension of the Standard Model, there is an enhancement to the B→Xsγ process in the contribution of vector-like quarks, resulting in a non-decoupling effect in such models.

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