$X(3872)\to J/\psi\pi^+\pi^-$ and $X(3872)\to J/\psi \pi^+\pi^-\pi^0$ decay widths from QCD sum rules

Abstract

New spectroscopy from the B factories, the advent of CLEO-c and the BES upgrade renewed the interest in charmonia. Among the new measurements, the state X(3872) has received special attention due to its unexpected properties. Its structure has been studied with different theoretical approaches, most of them being able to reproduce the measured mass. A further test for the theoretical descriptions of the X(3872) is to explain its narrow decay width. In this work we address the decays $X\to J/\psi \pi^+\pi^-\pi^0$ and $X\to J/\psi \pi^+ \pi^-$, using QCD sum rules with the hypothesis that $X$ is a four quark state.