Θ +(1540) and Associated Exotic States
Abstract
Given the existing empirical evidence for an exotic Θ + baryon, we analyze possible properties of its SU(3)F-partners, paying special attention to the nonstrange member of the antidecuplet N*. A modified π N partial-wave analysis results in two candidate masses, 1680 MeV and 1730 MeV. In both cases, the N*should be rather narrow and highly inelastic. Our results suggest several directions for experimental studies that may clarify properties of the antidecuplet baryons, and structure of their mixing with other baryons. Recent experimental evidence from the GRAAL and STAR Collaborations could be interpreted as observations of a candidate for the Θ + nonstrange partner. We also briefly discuss recent negative results regarding the Θ -baryon and the possibility of higher exotic multiplets.
- Publication:
-
Acta Physica Polonica B
- Pub Date:
- July 2005
- Bibcode:
- 2005AcPPB..36.2247S