Search for a Theta++ Pentaquark State

Abstract

Recent reports about the Theta+ (formerly known as Z+), a pentaquark state, have awakened considerable interest. We report our findings in search of a Theta++ state over a wide range in mass in the reaction gp-->Theta++K- from our analysis of CLAS data. The existence or nonexistence of this state might resolve the question of the isotensor states.

Comments: 9 pages, 11 figures. Original version is the contribution to proceedings of the "VIII International Conference on Hypernuclear & Strange Particle Physics", Jefferson Lab, Newport News, VA, USA, October 14-18, 2003. The revised version contains more details for clarification, additional comparisons with theoretical predictions and other experimental results with references to recent papers. All qualitative results are unchanged