79 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
Exotic baryons from a heavy meson and a nucleon - Positive parity states -
We study heavy baryons with exotic flavor quantum numbers formed by a heavy
meson and a nucleon (DbarN and BN) with positive parity. One pion exchange
interaction, providing a tensor force, dominates as a long range force to bind
the DbarN and BN ystems. In the heavy quark mass limit, pseudoscalar meson and
vector meson are degenerate and the binding mechanism by the tensor force
analogous to that in the nuclear systems becomes important. As a result, we
obtain the DbarN and BN resonant states in the J^P=1/2^+, 3/2^+ and 5/2^+
channels with I=0
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