High Resolution Search for Exotic Pentaquark ${\Theta }^{++}$, and ${\Theta }^{+}$ at Jefferson Lab

Abstract

Recent evidence for the existence of pentaquark ${\Theta }^{+}$ particle from several experiments at several different laboratories around the world has caused great excitement and raised many unanswered questions. We discuss a new proposal on a high resolution experiment searching for pentaquark states in Hall C at Jefferson Lab using an untagged bremsstrahlung photon beam employing both the hydrogen and the deuterium targets by studying the following processes: $\gamma p\to {\Theta }^{++}{K}^{-}$, and $\gamma n\to {\Theta }^{+}{K}^{-}$. This new experiment will significantly improve our current knowledge of the mass, the width of the ${\Theta }^{+}$ particle if it is confirmed and provide unambiguous evidence for the existence or non-existence of the ${\Theta }^{++}$ particle from the γp \to Θ^{++} K^-$ process.

3 pages, 2 figures, talk presented at the YITP workshop YITP-W-03-21 on ``Multi-quark Hadron: four, five and more?'', Feb. 2004, Kyoto, Japan