Abstract
We discuss the possible existence of exotic dibaryons with a heavy antiquark, being realized three-body systems, [Formula: see text] and B(*)NN. These are genuinely exotic states with no quark-antiquark annihilation. We consider the heavy quark spin symmetry and chiral symmetry, and introduce the one pion exchange potential between a [Formula: see text] meson and a nucleon N. As for the NN interaction, we employ the Argonne [Formula: see text] potential. By solving the coupled-channel equations for PNN and [Formula: see text], we find bound and resonant states near the thresholds both in charm and bottom sectors.
Highlights
The recent findings of charged quarkonium-like states, Zb( ) near the B(∗)B∗ threshold[1] and Zc(3900) above the DD ∗ threshold,[2] have added a new evidence of the exotic states in addition to candidate such as f0, a0, and Λ(1405) in strangeness sector,[3, 4] X, Y and Z in charm and bottom sectors,[5] implying hadronic molecules or composites
We study the bound and/or resonant states by solving the coupled-channel Schrodinger equations for P N N and P ∗N N channels
We introduce the one pion exchange potential (OPEP) as an interaction between a P (∗) meson and a nucleon N from the heavy meson effective theory.[12,13,14]
Summary
The recent findings of charged quarkonium-like states, Zb( ) near the B(∗)B∗ threshold[1] and Zc(3900) above the DD ∗ threshold,[2] have added a new evidence of the exotic states in addition to candidate such as f0, a0, and Λ(1405) in strangeness sector,[3, 4] X, Y and Z in charm and bottom sectors,[5] implying hadronic molecules or composites They carry exotic quantum numbers that cannot be reached by the standard quark model for mesons of qqand for baryons for qqq. There have been several works of D (∗) (B(∗)) mesons in nuclear matter and in atomic nuclei.[19,20,21,22,23,24] few-body systems of D (∗) (B(∗)) nuclei with a few baryon numbers are expected due to the attractive force between a D (∗) (B(∗)) meson and a nucleon. We emphasize that D (∗)N N and B(∗)N N are unique as few-body systems, because the counterpart in strangeness sector, KN N , does not exist due to the repulsive interaction between a K meson and a nucleon N
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