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

  • 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 Cπ+π- and Sπ+π- in B0→π+π-. The U-spin breaking effect between B0→π+π- and BS0→K+K- is estimated to be around 30%.
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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
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 shu
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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-*

  • 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
Fund Project:  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)

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 Cπ+π- and Sπ+π- in B0→π+π-. The U-spin breaking effect between B0→π+π- and BS0→K+K- is estimated to be around 30%.

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