Hidden charm molecules in finite volume

Abstract

In the present paper we address the interaction of pairs of charmed mesons with hidden charm in a finite box. We use the interaction from a recent model based on heavy quark spin symmetry that predicts molecules of hidden charm in the infinite volume. The energy levels in the box are generated within this model, and from them some synthetic data are generated. These data are then employed to study the inverse problem of getting the energies of the bound states and phase shifts for DD or D * D * . Different strategies are investigated using the lowest two levels for different values of the box size, carrying a study of the errors produced. Starting from the upper level, fits to the synthetic data are carried out to determine the scattering length and effective range plus the binding energy of the ground state. A similar strategy using the effective range formula is considered with a simultaneous fit to the two levels, one above and the other one below threshold. This method turns out to be more efficient than the other one. Finally, a method based on the fit to the data by means of a potential and a loop function conveniently regularized, turns out to be very efficient and allows to produce accurate results in the infinite volume starting from levels of the box with errors far larger than the uncertainties obtained in the final results. A regularization method based on Gaussian wave functions turns out to be rather efficient in the analysis and as a byproduct a practical and fast method to calculate the Lüscher function with high precision is presented.

Recent Results from WASA-at-COSY

“…The observed d * decay branchings into the diverse two-pion channels are consistent with expectations from isospin decomposition [28] as well as explicit theoretical calculations [29][30][31].…”

S-waveKK*interactions in a finite volume and thefGeng1, Ren2, Zhou3 et al. 2015Phys. Rev. D292330View full textAdd to dashboardCite

“…It should be noted that although the bound state approaches its continuum limit as L increases, the potential approach has the advantage that it can connect the LQCD energy levels at moderate L or small L with the binding energies in the continuum in a quite accurate and model-independent way (for a relevant and extensive discussion, see, e.g., Ref. [62]). …”

The hidden-charm pentaquark and tetraquark states

“…The lattice QCD simulation and related studies can be found in Refs. [649,650,651,652]. The analogous states of the X(3872), such as X b involving b quarks, were investigated in Refs.…”