説明
We have investigated uudd\sbar pentaquarks by employing quark models with the meson exchange and the effective gluon exchange as qq and q\qbar interactions. The system for five quarks is dynamically solved; two quarks are allowed to have a diquark-like qq correlation. It is found that the lowest mass of the pentaquark is about 1947 -- 2144 MeV. There are parameter sets where the mass of the lowest positive-parity state become lower than that of the negative-parity states. Which parity corresponds to the observed peak is still an open question. Relative distance of two quarks with the attractive interaction is found to be by about 1.2 -- 1.3 times closer than that of the repulsive one. The diquark-like quark correlation seems to play an important role in the pentaquark systems.
8 pages, 1 figure, Talk given at International Workshop PENTAQUARK04 at SPring-8, Japan, July 20-23, 2004
収録刊行物
-
- Pentaquark 04
-
Pentaquark 04 262-269, 2005-05-01
World Scientific Pub Co Pte Ltd