Antidecuplet candidate Xi(--)(1862) as a heptaquark with the overlap of two antikaons and a nucleon

作者：Bicudo P^*

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2004, 70(11): 111504.

DOI：10.1103/PhysRevD.70.111504

I study the very recently discovered S=-2 resonance Xi(--)(1886) by the NA49 Collaboration at the CERN SPS. I find that repulsion excludes the Xi(--) as a ddss(u) over bar s-wave pentaquark. I explore the Xi(--) as a heptaquark, equivalent to a N+K+K linear molecule, with positive parity and total isospin I=3/2. I find that the kaon-kaon repulsion is canceled by the attraction existing in the kaon-nucleon channels. In our framework this state is easier to bind than the Theta(+) described by a pi+K+N Borromean bound state. The remaining I=1/2 doublet and I=1 triplet of the exotic antidecuplet are also studied, and the coupling to p-wave decay channels is briefly addressed.

• 出版日期2004-12