902 research outputs found
Exotic dibaryons with a heavy antiquark
We discuss the possible existence of exotic dibaryons with a heavy antiquark,
being realized three-body systems, Dbar^(*)NN and B^(*)NN. These are genuinely
exotic states with no quark-antiquark annihilation. We consider the heavy quark
spin and chiral symmetries, and introduce the one pion exchange potential
between a Dbar^(*) (B^(*)) meson and a nucleon N. As for the NN interaction, we
employ the Argonne v^\prime_8 potential. By solving the coupled-channel
equations for PNN and P^* NN (P^(*)=Dbar^(*) and B^(*)), we find bound states
for (I,J^P)=(1/2,0^-) as well as resonant states for (I,J^P)=(1/2,1^-) both in
Dbar^(*)NN and B^(*)NN systems. We also discuss the heavy quark limit, and find
that the spin degeneracy is realized in the bound states with (I,J^P)=(1/2,0^-)
and (1/2,1^-).Comment: 4 pages, 1 figur
- …