We study spin 1/2 isoscalar and isovector, even and odd parity candidates for the Ȯ+(1540) pentaquark particle using large scale lattice QCD simulations. We utilise several possible wave functions (operators), including spatially non-trivial ones with unit orbital angular momentum. Linear combinations of those have a good chance of spanning both the scattering and the pentaquark states. We can clearly distinguish the lowest scattering state (s) in both parity channels up to above the expected location of the pentaquark, but we find no trace of the latter. Based on that we conclude that there are most probably no pentaquark bound states at our quark masses corresponding to mπ = 400-630 MeV. However, we cannot rule out the existence of a pentaquark state at the physical quark mass or pentaquarks with more exotic wave functions.
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2005|
|Event||23rd International Symposium on Lattice Field Theory, LAT 2005 - Dublin, Ireland|
Duration: Jul 25 2005 → Jul 30 2005
All Science Journal Classification (ASJC) codes