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29 March 2024
 
  » arxiv » nucl-th/9704033

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In-Medium Effective Axial-Vector Coupling Constant
Tae-Sun Park ; Hong Jung ; Dong-Pil Min ;
Date 16 Apr 1997
Journal Phys.Lett. B409 (1997) 26-32
Subject nucl-th hep-ph
AbstractThe axial-vector coupling constant in nuclear medium is systematically studied using chiral perturbation theory. For normal nuclear matter, the first non-trivial corrections are estimated based on the independent particle approximation taking into account nuclear correlations in nuclear medium. The one-pion-exchange (OPE) two-body interactions turn out to enhance the coupling constant by $delta g_A/g_Asimeq (0.09 sim 0.15)$. The role of the four-nucleon contact interaction, whose low-energy constants are yet to be determined, is analyzed in connection with the empirical quenching factor of $delta g_A/g_Asimeq -0.2$ in the presence of the nuclear short-range correlation. Conventional approaches are discussed in the light of our result.
Source arXiv, nucl-th/9704033
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