### Abstract

We propose a phenomenological QCD sum rule with an explicit diquark field to investigate the essential ingredients inside the hadrons. By introducing the mass m_{φ} and the condensate φ2 for the diquark field as parameters in the model, we find that the sum rule works well for Λ, Λ_{c}, and Λ_{b}. This implies that these Λ baryons can be represented by a diquark and a quark configuration. We also find that there is a duality relation among the parameters (m_{φ}, φ2) for which the sum rule is equally good. In the limit when φ=0, we find m_{φ}=400 MeV, which can be thought of as the constituent diquark mass.

Original language | English |
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Article number | 025204 |

Journal | Physical Review C - Nuclear Physics |

Volume | 84 |

Issue number | 2 |

DOIs | |

Publication status | Published - 2011 Aug 26 |

### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics

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## Cite this

Kim, K., Jido, D., & Lee, S. H. (2011). Diquarks: A QCD sum rule perspective.

*Physical Review C - Nuclear Physics*,*84*(2), [025204]. https://doi.org/10.1103/PhysRevC.84.025204