| 日時: |
2005-05-12 16:00 - |
| 場所: |
研究本館２階２２０号室 |
| 会議名: |
Lattice study for penta-quark states |
| 連絡先: |
丹後 |
| 講演者: |
Dr. Takashi Umeda (京都大学YITP) |
| 講演言語: |
日本語 |
| アブストラクト: |
We study spin $\frac12$ hadronic states in quenched lattice QCD to search for a possible $S=+1$ pentaquark resonance.
Simulations are carried out on $83\times 24$, $103\times 24$, $123\times 24$ and $163\times 24$ lattices at $\beta$=5.7 at the quenched level with the standard plaquette gauge action and the Wilson quark action.
We adopt two independent operators with the quantum numbers $(I,J)=(0,\frac12)$ to construct $2\times 2$ correlation matrices.
After the diagonalization of the correlation matrices, we successfully obtain the energies of the lowest state
and the 2nd-lowest state in this channel.
The analysis of the volume dependence of the energies and spectral weight factors indicates that a resonance state is likely to exist slightly above the NK threshold in $(I,J^P)=(0,\frac12^-)$ channel.
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