Hybrid baryons via QCD sum rules
- Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
Hybrid baryons, consisting of the three light quarks and a gluon, are investigated using the QCD sum rule method. We find that the mixed condensate {l_angle}0{vert_bar}{bar {psi}}{sigma}{ital G}{psi}{vert_bar}0{r_angle}={ital m}{sup 2}{sub 0}{l_angle}0{vert_bar}{bar {psi}}{psi}{vert_bar}0{r_angle} plays a dominant role in hybrid baryons in contrast with the quark condensate in the nucleon case. For the standard value of {ital m}{sup 2}{sub 0}=0.8 GeV{sup 2}, the mass of the lowest hybrid state is found to be approximately 1.5 GeV, about the observed mass of the Roper resonance.
- OSTI ID:
- 45658
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 11 Vol. 51; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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