Coupled-channel meson-meson scattering in the diabatic framework
Abstract
We apply the diabatic framework, a QCD-based formalism for the unified study of quarkoniumlike systems in terms of heavy quark-antiquark and open-flavor meson-meson components, to the description of coupled-channel meson-meson scattering. For this purpose, we first introduce a numerical scheme to find the solutions of the diabatic Schr\"odinger equation for energies in the continuum, then we derive a general formula for calculating the meson-meson scattering amplitudes from these solutions. We thus obtain a completely nonperturbative procedure for the calculation of open-flavor meson-meson scattering cross sections from the diabatic potential, which is directly connected to lattice QCD calculations. A comprehensive analysis of various elastic cross sections for open-charm and open-bottom meson-meson pairs is performed in a wide range of the center-of-mass energies. The relevant structures are identified, showing a spectrum of quasi-conventional and unconventional quarkoniumlike states. In addition to the customary Breit-Wigner peaks we obtain nontrivial structures such as threshold cusps and minimums. Finally, our results are compared with existing data and with results from our previous bound-state--based analysis, finding full compatibility with both.
Keywords
Cite
@article{arxiv.2107.05459,
title = {Coupled-channel meson-meson scattering in the diabatic framework},
author = {R. Bruschini and P. González},
journal= {arXiv preprint arXiv:2107.05459},
year = {2021}
}
Comments
15 pages, 3 figures; v2: extended bibliography, new paragraph in Introduction, corrected statement near end of Sec. II, additional minor modifications