QCD sum rules: [Delta]-[ital N] and [Sigma][sup 0]-[Lambda] mass splittings

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.49.460· OSTI ID:5340271

Hwang, W P; Yang, K ^[1]

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1. Department of Physics, National Taiwan University, Taipei, Taiwan 10764 (Taiwan, Province of China)

We use the method of QCD sum rules to investigate both the [Delta]-[ital N] and [Sigma][sup 0-][Lambda] mass splittings. In the case of the [Delta]-[ital N] mass splitting, our numerical results indicate that the mass splitting is dominated primarily by the quark-gluon condensate [l angle]0[vert bar][ital g][sub [ital c][bar q]][sigma][sub [mu][nu]]([lambda][sup [ital a]]/2)[ital G][sub [ital a]][sup [mu][nu]][ital q][vert bar]0[r angle] and the observed mass splitting may be understood. In the case of [Sigma][sup 0-][Lambda] mass splitting, we obtain a value of about 66 MeV, which is slightly smaller than the observed value of 77 MeV.

• OSTI ID: 5340271
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 49:1; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
CONDENSATES
DELTA BARYONS
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
FIELD THEORIES
HADRONS
HYPERONS
INTERACTIONS
MASS DIFFERENCE
N BARYONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK-GLUON INTERACTIONS
SIGMA BARYONS
SIGMA NEUTRAL PARTICLES
SIGMA PARTICLES
STRANGE PARTICLES
SUM RULES