2004/09/09 by Atsushi Hosaka, A. Hosaka, Hosaka, A.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Stellar, planetary, and galactic studies #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0409101
4 pages, Proceedings for the YITP Workshop on Multi-quark Hadrons: Four, Five and More? (YITP-W-03-21), Kyoto, Japan, 17-19 Feb 2004
arxiv created 2004/09/09 · openalex publication_date 2004/09/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study properties of the pentaquark particle Theta+ with emphasis on the role of chiral symmetry. It is shown that when chiral force is sufficiently strong, the positive parity Theta+ may be realized with a lower mass relative to the negative parity state. The decay width is then studied in the non-relativistic quark model. It is shown that the narrow width may be realized for the positive parity state, while the seemingly lowest negative parity state couples strongly to the continuum state resulting in a very broad width. Finally, Theta+ production is studied in photo-induced and proton-induced processes. The polarized proton reaction provides a model independent method to determine the parity of Theta+.