2006/09/05 by А. М. Бадалян, A. M. Badalian, B. L. G. Bakker
Physics and Astronomy · #Atomic physics #Computer science #Computer security #High-Energy Particle Collisions Research #Hyperfine structure #Particle physics theoretical and experimental studies #Philosophy #Physics #Quantum Chromodynamics and Particle Interactions #RADIUS #Scroll #Spin (aerodynamics) #Theology #hep-ph
paper · pdf · doi:10.1016/j.physletb.2006.12.066
published as Phys.Lett.B646:29-33,2007 · 13 pages, no figures
arxiv created 2006/09/05 · openalex publication_date 2007/01/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The hyperfine splittings in heavy quarkonia are studied using new experimental data on the di-electron widths. The smearing of the spin–spin interaction is taken into account, while the radius of smearing is fixed by the known J/ψ−ηc(1S) and ψ(2S)−ηc′(2S) splittings and appears to be small, rss≈0.06 fm. Nevertheless, even with such a small radius an essential suppression of the hyperfine splittings (∼50%) is observed in bottomonium. For the nS bb¯ states (n=1,2,…,6) the values we predict (in MeV) are 28, 12, 10, 6, 6, and 3, respectively. In single-channel approximation for the 3S and 4S charmonium states the splittings 16(2) and 12(4) MeV are obtained.