QCD Sum Rules for $Σ$ Hyperons in Nuclear Matter

Details QCD Sum Rules for $Σ$ Hyperons in Nuclear Matter QCD Sum Rules for $Σ$ Hyperons in Nuclear Matter

1994-05-19

arxiv.org/abs/hep-ph/9405331v1

Phys.Rev.C51:347,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages in revtex, 6 figures available under request as ps files, UMD preprint #94--118

Scientific paper

10.1103/PhysRevC.51.347

Within 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.

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