Ambiversion of X(3872)

Abstract

An analysis including most recent Belle data on X(3872) is performed, using coupled channel Flatté formula. A third sheet pole close to but \textit{below} $D^0{D}^{\ast 0}$ threshold is found, besides the bound state/virtual state pole discussed in previous literature. The co-existence of two poles near the $D^0{D}^{\ast 0}$ threshold indicates that the X(3872) may be of ordinary $c\bar{c}$ $2^3{P}_1$ state origin, distorted by strong coupled channel effects. The latter manifests itself as a molecular bound state (or a virtual state).

Comments: Slightly revised version accepted for publication in Physics Letter B