QCD sum rules for [Lambda] hyperons in nuclear matter

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.49.1190· OSTI ID:5196120

Jin, X ^[1]; Furnstahl, R J ^[2]

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1. Department of Physics and Center for Theoretical Physics, University of Maryland, College Park, Maryland 20742 (United States)
2. Department of Physics, The Ohio State University, Columbus, Ohio 43210 (United States)

The self-energies of a [Lambda] hyperon propagating in nuclear matter are studied using finite-density QCD sum-rule methods. A correlator of [Lambda] interpolating fields is evaluated in the nuclear matter ground state using both an operator product expansion and a dispersion relation with a spectral ansatz. The Lorentz vector self-energy of the [Lambda] is found to be substantially smaller than the corresponding nucleon vector self-energy. The magnitude of Lorentz scalar self-energy of the [Lambda] is also smaller than the corresponding value for nucelon; however, this prediction is sensitive to the assumed density dependence of certain four-quark condensates. The scalar and vector self-energies tend to cancel, but not completely. The implications for the [Lambda] spin-oribt force in a finite nucleus are discussed.

• DOE Contract Number: FG05-87ER40322
• OSTI ID: 5196120
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 49:2; 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
HYPERONS
LAMBDA BARYONS
MATTER
NUCLEAR MATTER
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SELF-ENERGY
STRANGE PARTICLES
SUM RULES