CP asymmetries in Strange Baryon Decays

  • While indirect and direct CP violation (CPV) has been established in the decays of strange and beauty mesons, no CPV has yet been found for baryons. There are different paths to finding CP asymmetry in the decays of strange baryons; they are all highly non-trivial. The HyperCP Collaboration has probed CPV in the decays of single Ξ and Λ[1]. We discuss future lessons from e+e- collisions at BESⅢ/BEPCⅡ:probing decays of pairs of strange baryons, namely Λ, ∑ and Ξ. Realistic goals are to learn about non-perturbative QCD. One can hope to find CPV in the decays of strange baryons; one can also dream of finding the impact of New Dynamics. We point out that an important new era will start with the BESⅢ/BEPCⅡ data accumulated by the end of 2018. This also supports new ideas to trigger J/ψ → Λ Λ at the LHCb collaboration.
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I. I. Bigi, Xian-Wei Kang and Hai-Bo Li. CP asymmetries in Strange Baryon Decays[J]. Chinese Physics C, 2018, 42(1): 013101. doi: 10.1088/1674-1137/42/1/013101
I. I. Bigi, Xian-Wei Kang and Hai-Bo Li. CP asymmetries in Strange Baryon Decays[J]. Chinese Physics C, 2018, 42(1): 013101.  doi: 10.1088/1674-1137/42/1/013101 shu
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Received: 2017-09-26
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    Supported by National Science Foundation (PHY-1520966), National Natural Science Foundation of China (11335009, 11125525), Joint Large-Scale Scientific Facility Funds of the NSFC and CAS (U1532257), the National Key Basic Research Program of China (2015CB856700), Key Research Program of Frontier Sciences, CAS, (QYZDJ-SSW-SLH003), XWK's work is also supported by MOST (Taiwan) (104-2112-M-001-022)

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CP asymmetries in Strange Baryon Decays

    Corresponding author: I. I. Bigi,
    Corresponding author: Xian-Wei Kang,
    Corresponding author: Hai-Bo Li,
  • 1.  Department of Physics, University of Notre Dame du Lac, Notre Dame, IN 46556
  • 2. College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875
  • 3. Institute of Physics, Academia Sinica, Taipei 115
  • 4. Institute of High Energy Physics, Beijing 100049
  • 5. Institute of High Energy Physics, Beijing 100049
  • 6. University of Chinese Academy of Science, Beijing 100049
Fund Project:  Supported by National Science Foundation (PHY-1520966), National Natural Science Foundation of China (11335009, 11125525), Joint Large-Scale Scientific Facility Funds of the NSFC and CAS (U1532257), the National Key Basic Research Program of China (2015CB856700), Key Research Program of Frontier Sciences, CAS, (QYZDJ-SSW-SLH003), XWK's work is also supported by MOST (Taiwan) (104-2112-M-001-022)

Abstract: While indirect and direct CP violation (CPV) has been established in the decays of strange and beauty mesons, no CPV has yet been found for baryons. There are different paths to finding CP asymmetry in the decays of strange baryons; they are all highly non-trivial. The HyperCP Collaboration has probed CPV in the decays of single Ξ and Λ[1]. We discuss future lessons from e+e- collisions at BESⅢ/BEPCⅡ:probing decays of pairs of strange baryons, namely Λ, ∑ and Ξ. Realistic goals are to learn about non-perturbative QCD. One can hope to find CPV in the decays of strange baryons; one can also dream of finding the impact of New Dynamics. We point out that an important new era will start with the BESⅢ/BEPCⅡ data accumulated by the end of 2018. This also supports new ideas to trigger J/ψ → Λ Λ at the LHCb collaboration.

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