### Session DE: Mini-symposium on Pentaquarks I

7:00 PM–9:45 PM, Tuesday, September 20, 2005
Ritz-Carlton Hotel Room: Amphitheater

Chair: Makoto Oka, Tokyo Institute of Technology

Abstract ID: BAPS.2005.HAW.DE.8

### Abstract: DE.00008 : Anisotropic lattice QCD studies of spin 3/2 penta-quark

9:00 PM–9:15 PM

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#### Authors:

Noriyoshi Ishii
(Department of Physics H-27, Tokyo Institute of Technology)

Takumi Doi
(RIKEN BNL Research Center)

Yukio Nemoto
(Department of Physics, Nagoya Univerisity)

Makoto Oka
(Department of Physics H-27, Tokyo Institute of Technology)

Hideo Suganuma
(Department of Physics, Kyoto University)

Anisotropic lattice QCD results for the penta-quark(5Q) $\Theta^+$ in $J^{P}=3/2^{\pm}$ channel are presented for a high-precision mass measurement using a large number of gauge configurations as $N_{\rm conf}=1000$. The standard Wilson gauge action at $\beta=5.75$ with the renormalized anisotropy as $a_{\rm s}/a_{\rm t} = 4$, and $O(a)$ improved Wilson (clover) quark action with $\kappa=0.1210(0.0010)0.1240$ are employed on a $12^3 \times 96$ lattice. Several Rarita-Schwinger interpolating fields with isospin $I=0$ are examined such as (a) the NK$^*$-type, (b) the (color-)fused NK$^*$-type, (c) a diquark-type. The chiral extrapolation leads to only massive states as $m_{5Q} > 2$ GeV. The analysis with the hybrid BC(HBC) is performed to investigate whether these states are compact 5Q resonances or not. No localized 5Q resonance states are found.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2005.HAW.DE.8