Isosinglet-isotriplet mixing and the $X(3872)$ lineshape

Abstract

We investigate the lineshapes of the $X(3872)$ in $B^+$ decays production within a framework that incorporates two underlying QCD configurations: a compact isosinglet state $X_S$ and the neutral component of a molecular isotriplet $X_T^0$. The physical signal is interpreted as arising from the mixing of these states, induced by strong isospin breaking. The decay amplitude is constructed in a factorized form, separating short-distance production, non-relativistic propagation and final-state interactions. This setup allows for a unified description of both $DD^*$ and $J/\psi\,+$ pions final states. We show that the interplay between the two components and their mixing can qualitatively reproduce several nontrivial experimental features. In particular, interference effects can enhance the charged $DD^*$ channel relative to the neutral one despite phase-space suppression, and generate distinctive structures in the $J/\psi \pi^+\pi^-$ and $J/\psi \pi^+\pi^-\pi^0$ lineshapes, including the possibility of strong distortions near threshold.