Diquarks: A QCD sum rule perspective
Journal Article
·
· Physical Review. C, Nuclear Physics
- Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749 (Korea, Republic of)
- Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
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{sub {phi}} and the condensate <{phi}{sup 2}> for the diquark field as parameters in the model, we find that the sum rule works well for {Lambda}, {Lambda}{sub c}, and {Lambda}{sub 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{sub {phi},}<{phi}{sup 2}>) for which the sum rule is equally good. In the limit when <{phi}{sup 2}>=0, we find m{sub {phi}=}400 MeV, which can be thought of as the constituent diquark mass.
- OSTI ID:
- 21596701
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 84; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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