Constraining the UT angle &gamma; by CP violation parameters in B0&rarr;&pi;+&pi;-*

Qin Qin; Zhi-Tian Zou; Ying Li; Cai-Dian L&uuml;

doi:10.1088/1674-1137/40/3/031001

Chinese Physics C> 2016, Vol. 40> Issue(3) : 031001 DOI: 10.1088/1674-1137/40/3/031001

Constraining the UT angle γ by CP violation parameters in B⁰→π⁺π^-*

Qin Qin ¹ ,
Zhi-Tian Zou ² ,
Ying Li ^2,3 ,
Cai-Dian Lü ^1,3

1.
Institute of High Energy Physics, Beijing 100049, China
2.
Department of Physics, Yantai University, Yantai, 264005, China
3.
Department of Physics, Yantai University, Yantai, 264005, China
4.
State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
5.
Institute of High Energy Physics, Beijing 100049, China

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Abstract：
We calculate the tree and penguin amplitudes in the B⁰→π⁺π^- decay channel employing the perturbative QCD factorization approach. Using the amplitudes as input with the theoretical uncertainties sufficiently considered, we constrain the UT angle γ to 53°≤γ≤70°, from the measurements of the CP violation parameters C_π⁺π^- and S_π⁺π^- in B⁰→π⁺π^-. The U-spin breaking effect between B⁰→π⁺π^- and B_S⁰→K⁺K^- is estimated to be around 30%.
- CP violation ,
- extraction ,
- B meson decay

References

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Qin Qin, Zhi-Tian Zou, Ying Li and Cai-Dian Lü. Constraining the UT angle γ by CP violation parameters in B⁰→π⁺π^-*[J]. Chinese Physics C, 2016, 40(3): 031001. doi: 10.1088/1674-1137/40/3/031001

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Received: 2015-09-10

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Partly Supported by National Science Foundation of China (11175151, 11235005, 11375208, 11447032, 11575151), Natural Science Foundation of Shandong Province (ZR2014AQ013) and the Program for New Century Excellent Talents in University (NCET) by Ministry of Education of P.R. China (NCET-13-0991)

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Constraining the UT angle γ by CP violation parameters in B⁰→π⁺π^-*

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Constraining the UT angle γ by CP violation parameters in B⁰→π⁺π^-*

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