Year: 2025
Type: article
Abstract: A bstract The conventional loosely bound molecule interpretation of the X (3872) is not compatible with the recent LHCb experimental measurement of the ratio of branching fractions $$ \mathcal{R} $$ R = Br( X → ψ ′ γ ) / Br( X → ψγ ). We systematically determine the entire tetraquark spectrum for J = 0 , 1 , 2 and refine the calculation of $$ \mathcal{R} $$ R in an improved Born-Oppenheimer description of the X (3872) compact tetraquark. This refinement yields a significantly better agreement with experimental data on $$ \mathcal{R} $$ R and on the spectroscopy of the states themselves. Extending the diquark-antidiquark paradigm to encompass tetraquarks that are linear super-positions of open charm singlets and color octets, we discover that these exotic resonances manifest as compact shallow bound states of quarks in color force potentials.
Source: Journal of High Energy Physics
Authors: D. Germani, B. Grinstein, A. D. Polosa
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Funder: U.S. Department of Energy
OpenAlex ID: W4409176044