Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-03-31
PoS LATTICE2008:155,2008
Physics
High Energy Physics
High Energy Physics - Lattice
A talk given at the XXVI International Symposium on Lattice Field Thoery(LATTICE2008), July 14-19, 2008, Williamsburg, Virgini
Scientific paper
Two of recent progress in lattice QCD approach to nuclear force are reported. (i) Tensor force from quenched lattice QCD: By truncating the derivative expansion of inter-nucleon potential to the strictly local terms, we obtain central force V_C(r) and tensor force V_T(r) separately from s-wave and d-wave components of Bethe-Salpeter wave function for two nucleon state with J^P=1^+. Numerical calculation is performed with quenched QCD on 32^4 lattice using the standard plaquette action at beta=5.7 with the standard Wilson quark action with kappa=0.1640, 0.1665, 0.1678. Preliminary results show that the depths of the resulting tensor force amount to 20 to 40 MeV, which is enhanced in the light quark mass region. (ii) Nuclear force from 2+1 flavor QCD with PACS-CS gauge configuration: Preliminary full QCD results are obtained by using 2+1 flavor gauge configurations generated by PACS-CS collaboration. The resulting potential has the midium range attraction of about 30 MeV similar to the preceding quenched calculations. However, the repulsive core at short distance is significantly stronger than the corresponding quenched QCD result.
Aoki Sadao
for PACS-CS Collaboration
Hatsuda Tetsuo
Ishii Naohiro
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