Takashi Inoue, Sinya Aoki, Takumi Doi, Tetsuo Hatsuda, Yoichi Ikeda, Noriyoshi Ishii, Keiko Murano, Hidekatsu Nemura, Kenji Sasaki
Baryon-baryon potentials are obtained from 3-flavor QCD simulations with the
lattice volume L ~ 4 fm, the lattice spacing a ~ 0.12 fm, and the
pseudo-scalar-meson mass M_ps =469 - 1171 MeV. The NN scattering phase shift
and the mass of H-dibaryon in the flavor SU(3) limit are extracted from the
resultant potentials by solving the Schrodinger equation. The NN phase shift in
the SU(3) limit is shown to have qualitatively similar behavior as the
experimental data. A bound H-dibaryon in the SU(3) limit is found to exist in
the flavor-singlet J^P=0^+ channel with the binding energy of about 26 MeV for
the lightest quark mass M_ps = 469 MeV. Effect of flavor SU(3) symmetry
breaking on the H-dibaryon is estimated by solving the coupled-channel
Schrodinger equation for Lambda Lambda - N Xi - Sigma Sigma with the physical
baryon masses and the potential matrix obtained in the SU(3) limit: a resonant
H-dibaryon is found between Lambda Lambda and N Xi thresholds in this
treatment.
View original:
http://arxiv.org/abs/1112.5926
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