The bound state problem of S-wave heavy quark meson-aitimeson systems

TL;DR

This study uses a chiral SU(3) quark model to analyze whether S-wave heavy meson-antimeson systems can form bound states, finding certain B meson molecules plausible but disfavoring others, including the Z+(4051) resonance.

Contribution

It provides a systematic investigation of S-wave heavy meson molecules using the resonating group method within a chiral SU(3) quark model, highlighting which states are likely or unlikely to form bound states.

Findings

Favors existence of certain B meson molecules like B B̄, B* B̄*, and B B̄* (J=2, C=+).

Disfavors the formation of I=1/2 meson molecules and the Z+(4051) as an S-wave D* D̄* molecule.

Suggests some heavy meson-antimeson systems can form bound states, while others cannot.

Abstract

We investigated systematically whether the S-wave ($\bar{Q}q$) meson and the ($Q\bar{q}$) meson may form S-wave bound states in a chiral SU(3) quark model by solving the resonating group method equation. Here $Q=c$ or $b$ and $q=u$, $d$ or $s$. Our preliminary calculation disfavors the existence of $I=\frac12$ ($\bar{Q}l$)-($Q\bar{s}$) molecules ($l=u,d$) while favors the existence of isoscalar $B\bar{B}$, $B^*\bar{B}^*$ (J=2) and $B\bar{B}^*$ (C=+) molecules. The existence of isovector (charm-anticharm) and (charm-bottom) molecules is also disfavored. Therefore the resonance-like structure $Z^+(4051)$ is unlikely to be an S-wave $D^*\bar{D}^*$ molecule.