Wandering in Color-Space -- why the life of pentaquark is so long ? --

Abstract

The problem of the long life time of the pentaquark ${\Theta }^{+}$ is investigated on the basis of the color molecular dynamics simulation. We find that it takes a long time (typically of 50-100 fm/c) for the initial pentaquark-state to rearrange its color and spatial positions to decay into the nucleon + kaon final state. Structure of the potential surface in the color and position spaces also supports this picture. Pentaquark wanders on the potential surface to find a narrow channel to decay.

Comments: To appear in Teller Memorial Volume of Acta Physica Hungarica A (Heavy Ion Physics), 2004