Weak decays of doubly heavy baryons: “decay constants”

  • Inspired by the recent observation of the Ξcc++ by the LHCb Collaboration, we explore the "decay constants" of doubly heavy baryons in the framework of QCD sum rules. With the Ξcc, Ξbc, Ξbb, and Ωcc, Ωbc, Ωbb baryons interpolated by three-quark operators, we calculate the correlation functions using the operator product expansion and include the contributions from operators up to dimension six. On the hadron side, we consider both contributions from the lowest-lying states with JP=1/2+ and from negative parity baryons with JP=1/2-. We find that the results are stable and the contaminations from negative parity baryons are not severe. These results are ingredients for the QCD study of weak decays and other properties of doubly-heavy baryons.
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Xiao-Hui Hu, Yue-Long Shen, Wei Wang and Zhen-Xing Zhao. Weak decays of doubly heavy baryons: “decay constants”[J]. Chinese Physics C, 2018, 42(12): 123102. doi: 10.1088/1674-1137/42/12/123102
Xiao-Hui Hu, Yue-Long Shen, Wei Wang and Zhen-Xing Zhao. Weak decays of doubly heavy baryons: “decay constants”[J]. Chinese Physics C, 2018, 42(12): 123102.  doi: 10.1088/1674-1137/42/12/123102 shu
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Received: 2018-06-28
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    Supported by National Natural Science Foundation of China (11575110, 11655002, 11735010), Natural Science Foundation of Shanghai (15DZ2272100, 15ZR1423100), Shanghai Key Laboratory for Particle Physics and Cosmology and Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education

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Weak decays of doubly heavy baryons: “decay constants”

    Corresponding author: Wei Wang,
    Corresponding author: Zhen-Xing Zhao,
  • 1.  INPAC, Shanghai Key Laboratory for Particle Physics and Cosmology, MOE Key Laboratory for Particle Physics, Astrophysics and Cosmology, School of Physics and Astronomy, Shanghai Jiao-Tong University, Shanghai 200240, China
  • 2.  College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China
Fund Project:  Supported by National Natural Science Foundation of China (11575110, 11655002, 11735010), Natural Science Foundation of Shanghai (15DZ2272100, 15ZR1423100), Shanghai Key Laboratory for Particle Physics and Cosmology and Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education

Abstract: Inspired by the recent observation of the Ξcc++ by the LHCb Collaboration, we explore the "decay constants" of doubly heavy baryons in the framework of QCD sum rules. With the Ξcc, Ξbc, Ξbb, and Ωcc, Ωbc, Ωbb baryons interpolated by three-quark operators, we calculate the correlation functions using the operator product expansion and include the contributions from operators up to dimension six. On the hadron side, we consider both contributions from the lowest-lying states with JP=1/2+ and from negative parity baryons with JP=1/2-. We find that the results are stable and the contaminations from negative parity baryons are not severe. These results are ingredients for the QCD study of weak decays and other properties of doubly-heavy baryons.

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