Baryon-Baryon Interactions in the Flavor SU(3) Limit from Full QCD Simulations on the Lattice

Hidekatsu Nemura; Keiko Murano; Kenji Sasaki (HAL QCD collaboration); Noriyoshi Ishii; Sinya Aoki; Takashi Inoue; Takumi Doi; Tetsuo Hatsuda; Yoichi Ikeda

arxiv: 1007.3559 · v1 · pith:MH2KT5M6new · submitted 2010-07-21 · ✦ hep-lat · hep-ph· nucl-th

Baryon-Baryon Interactions in the Flavor SU(3) Limit from Full QCD Simulations on the Lattice

Takashi Inoue , Noriyoshi Ishii , Sinya Aoki , Takumi Doi , Tetsuo Hatsuda , Yoichi Ikeda , Keiko Murano , Hidekatsu Nemura

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Kenji Sasaki (HAL QCD collaboration)

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classification ✦ hep-lat hep-phnucl-th

keywords flavorbaryon-baryonchannelcoreflavor-spinfullinteractionslattice

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We investigate baryon-baryon (BB) interactions in the 3-flavor full QCD simulations with degenerate quark masses for all flavors. The BB potentials in the orbital S-wave are extracted from the Nambu-Bethe-Salpeter wave functions measured on the lattice. We observe strong flavor-spin dependences of the BB potentials at short distances. In particular, a strong repulsive core exists in the flavor-octet and spin-singlet channel (the 8_s representation), while an attractive core appears in the flavor singlet channel (the 1 representation). We discuss a relation of such flavor-spin dependence with the Pauli exclusion principle in the quark level. Possible existence of an H-dibaryon resonance above the Lambda-Lambda threshold is also discussed.

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