Diquarks: a QCD sum rule perspective

Details Diquarks: a QCD sum rule perspective Diquarks: a QCD sum rule perspective

2011-03-04

arxiv.org/abs/1103.0826v2

Phys.Rev.C84:025204,2011

Physics

Nuclear Physics

Nuclear Theory

4 pages, 4 figures, revised version published in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.84.025204

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. In the limit when \phi^2 =0 we find m_\phi=0.4 GeV, which can be thought as the constituent diquark mass.

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