Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-03-23
Phys.Rev.C72:035209,2005
Physics
Nuclear Physics
Nuclear Theory
11 pages, 4 figures
Scientific paper
10.1103/PhysRevC.72.035209
The external-field QCD Sum Rules method is used to evaluate the coupling constant of the light isoscalar-scalar meson (``$\sigma$'' or \epsilon) to the nucleon. The contributions that come from the excited nucleon states and the response of the continuum threshold to the external field are calculated. The obtained value of the coupling constant is compatible with the large value required in one-boson exchange potential models of the two-nucleon interaction.
Erkol Guray
Rijken TH. A.
Timmermans R. G. E.
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