Is the X(3872) a bound state ?
Abstract
All existing experimental evidence of the bound state nature of the relies on considering its decay products with a finite experimental spectral mass resolution which is typically MeV and much larger than its alleged binding energy, MeV. On the other hand, we have found recently that there is a neat cancellation in the channel for the invariant mass around the threshold between the continuum and bound state contribution. This is very much alike a similar cancellation in the proton-neutron continuum with the deuteron in the channel. Based on comparative fits of experimental cross section deuteron and prompt production in pp collisions data with a finite to a common Tsallis distribution we find a strong argument questioning the bound state nature of the state but also explaining the large observed production rate likely consistent with a half-bound state.
Keywords
Cite
@article{arxiv.1907.01441,
title = {Is the X(3872) a bound state ?},
author = {Pablo G. Ortega and Enrique Ruiz Arriola},
journal= {arXiv preprint arXiv:1907.01441},
year = {2020}
}
Comments
6 pages, 4 figures, 1 table