Pentaquark hadrons from lattice QCD

Details Pentaquark hadrons from lattice QCD Pentaquark hadrons from lattice QCD

2003-09-15

arxiv.org/abs/hep-lat/0309090v3

JHEP 0311:070,2003

Physics

High Energy Physics

High Energy Physics - Lattice

13 pages, 5 figures. Final version, appeared in JHEP

Scientific paper

10.1088/1126-6708/2003/11/070

We study spin 1/2 isoscalar and isovector candidates in both parity channels for the recently discovered \Theta^+(1540) pentaquark particle in quenched lattice QCD. Our analysis takes into account all possible uncertainties, such as statistical, finite size and quenching errors when performing the chiral and continuum extrapolations and we have indications that our signal is separated from scattering states. The lowest mass that we find in the I^P=0^- channel is in complete agreement with the experimental value of the \Theta^+ mass. On the other hand, the lowest mass state in the opposite parity I^P=0^+ channel is much higher. Our findings suggests that the parity of the \Theta^+ is negative.

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