Abstract
We introduce a phenomenological QCD sum rule with an explicit diquark field. We investigate certain configurations of hadrons are expected to have a good diquark structure. The parameters of the model are a diquark mass \({(m_\phi)}\) and condensate \({(\langle \phi^2\rangle)}\) . Assuming that Λ baryons can be represented by a diquark and a spectator quark configuration, we find the sum rule works well for Λ, Λ c , and Λ b . We also find a duality relation between the mass and the condensate for which the parameter sets give good Borel curves. To maintain good Borel curve, a smaller diquark condensate is needed for an increased diquark mass. Using these parameter sets, we test the diquark structure in some hadrons which contain both good and bad diquark configurations.
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Kim, K., Jido, D. & Lee, S.H. A QCD Sum Rule Approach with an Explicit Di-quark Field. Few-Body Syst 54, 271–274 (2013). https://doi.org/10.1007/s00601-012-0343-0
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DOI: https://doi.org/10.1007/s00601-012-0343-0