Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-06-20
Phys.Lett. B375 (1996) 310-314
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages including 4 figures. RevTex and epsfig.sty are used. Accepted for publication in Phys. Lett. B
Scientific paper
10.1016/0370-2693(96)00196-7
The existence of flavor exotic $QQ\bar{q}\bar{q}$ molecular-type states is investigated. An attractive force between two {\it pseudoscalar} $H = (Q\bar{q})$ heavy meson is generated by (correlated) two-pion exchange. The emergence of a (loosely) bound state depends crucially on the value of the coupling constant $g$ of the $H^*H\pi$ vertex. For a $g$ value calculated from the experimental upper limit on the width of the $D^*$ meson the considered mechanism alone is strong enough to generate a bound state in the $BB$ system while the $DD$ system is very close to become bound. Such states, if exist, are stable with respect to strong interactions. They may be observed as stable scalar particles with the mass $M\approx 2\,m_H$ and flavor quantum number $\pm 2$.
Kim Hyun-Chul
Shmatikov Mikhail
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