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Article overview
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Nucleon QCD sum rules in nuclear matter including four-quark condensates | E.G. Drukarev
; M.G. Ryskin
; V.A. Sadovnikova
; Th. Gutsche
; Amand Faessler
; | Date: |
20 Dec 2003 | Journal: | Phys.Rev. C69 (2004) 065210 | Subject: | nucl-th | Affiliation: | Gatchina, PNPI), Th. Gutsche and Amand Faessler (University of Tuebingen | Abstract: | We calculate the nucleon parameters in nuclear matter using the QCD sum rules approach in Fermi gas approximation. Terms up to 1/q^2 in the operator product expansion (OPE) are taken into account. The higher moments of the nucleon structure functions are included. The complete set of the nucleon expectation values of the four-quark operators is employed. Earlier the lack of information on these values has been the main obstacle for the further development of the approach. We show that the four-quark condensates provide the corrections of the order 20% to the results obtained in the leading orders of the OPE. This is consistent with the assumption about the convergence of the OPE. The nucleon vector self-energy Sigma_v and the nucleon effective mass m^* are expressed in terms of the in-medium values of QCD condensates. The numerical results for these parameters at the saturation value of the density agree with those obtained by the methods of nuclear physics. | Source: | arXiv, nucl-th/0401039 | Services: | Forum | Review | PDF | Favorites |
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