General scan in flavor parameter space in models with vector quark doublets and an enhancement in the B&rarr;X<sub>s</sub>&gamma; process

Wenyu Wang; Zhao-Hua Xiong; Xin-Yan Zhao

doi:10.1088/1674-1137/40/9/093102

Chinese Physics C> 2016, Vol. 40> Issue(9) : 093102 DOI: 10.1088/1674-1137/40/9/093102

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

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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→X_sγ. 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→X_sγ process in the contribution of vector-like quarks, resulting in a non-decoupling effect in such models.
- FCNC ,
- vector like particle ,
- CKM matrix

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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→X_sγ process[J]. Chinese Physics C, 2016, 40(9): 093102. doi: 10.1088/1674-1137/40/9/093102

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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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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Corresponding author: Wenyu Wang,

Corresponding author: Zhao-Hua Xiong,

Corresponding author: Xin-Yan Zhao,

Received Date: 2016-03-30

Accepted Date: 2016-05-13

Available Online: 2016-09-05

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→X_sγ. 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→X_sγ process in the contribution of vector-like quarks, resulting in a non-decoupling effect in such models.

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

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通讯作者: 陈斌, bchen63@163.com

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

Corresponding author: Wenyu Wang,

Corresponding author: Zhao-Hua Xiong,

Corresponding author: Xin-Yan Zhao,

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

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通讯作者: 陈斌, bchen63@163.com

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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,

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

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