QCD sum rules for [Sigma] hyperons in nuclear matter

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.51.347· OSTI ID:6697624

Jin, X; Nielsen, M ^[1]

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1. Department of Physics and Center for Theoretical Physics, University of Maryland, College Park, Maryland 20742 (United States)

Within the finite-density QCD sum-rule approach we investigate the self-energies of [Sigma] hyperons propagating in nuclear matter from a correlator of [Sigma] interpolating fields evaluated in the nuclear matter ground state. We find that the Lorentz vector self-energy of the [Sigma] is similar to the nucleon vector self-energy. The magnitude of Lorentz scalar self-energy of the [Sigma] is also close to the corresponding value for nucleon; however, this prediction is sensitive to the strangeness content of the nucleon and to the assumed density dependence of certain four-quark condensate. The scalar and vector self-energies tend to cancel, but not completely. The implications for the couplings of [Sigma] to the scalar and vector mesons in nuclear matter and for the [Sigma] spin-orbit force in a finite nucleus are discussed.

• DOE Contract Number: FG02-93ER40762
• OSTI ID: 6697624
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 51:1; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

662130 -- General Theory of Particles & Fields-- S-Matrix Theory
Relativistic Scattering Theory-- (1992-)
663110* -- General & Average Properties of Nuclei & Nuclear Energy Levels-- (1992-)
663300 -- Nuclear Reactions & Scattering
General-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
ELEMENTARY PARTICLES
ENERGY
EQUATIONS
FERMIONS
FIELD THEORIES
HADRONS
HYPERNUCLEI
HYPERONS
MATTER
NUCLEAR FRAGMENTS
NUCLEAR MATTER
NUCLEI
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SELF-ENERGY
SIGMA BARYONS
STRANGE PARTICLES
SUM RULES