Diquarks: a QCD sum rule perspective

Understand

We propose a phenomenological QCD sum rule with an explicit diquark field to investigate the essential ingredients inside the hadrons.

• Introducing the mass (m_\phi) and the condensate (\phi^2) for the diquark field as parameters in the model, we find that the sum rule works well for Lambda, Lambda_c and Lambda_b.
• This implies that these Lambda baryons can be represented by a diquark and a quark configuration.
• We also find that there is a duality relation among the parameters (m_\phi, \phi^2), for which the sum rule is equally good.