Absence of evidence for pentaquarks on the lattice

Details Absence of evidence for pentaquarks on the lattice Absence of evidence for pentaquarks on the lattice

2005-04-09

arxiv.org/abs/hep-lat/0504007v2

Phys.Rev.D73:074505,2006

Physics

High Energy Physics

High Energy Physics - Lattice

17 pages, 5 figures replaced with revised version

Scientific paper

10.1103/PhysRevD.73.074505

We study the question of whether or not QCD predicts a pentaquark state. We use the improved, fixed point lattice QCD action which has very little sensitivity to the lattice spacing and also allows us to reach light quark masses. The analysis was performed on a single volume of size $(1.8 {\rm fm})^3\times 3.6 {\rm fm}$ with lattice spacing of $a=0.102$ fm. We use the correlation matrix method to identify the ground and excited states in the isospin 0, negative parity channel. In the quenched approximation where dynamical quark effects are omitted, we do not find any evidence for a pentaquark resonance in QCD.

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