2009/03/31 by A. M. Badalian, B. L. G. Bakker, I. V. Danilkin · 1 citation
Physics and Astronomy · #hep-ph #hep-ex
paper · pdf · doi:10.1134/s1063778810010163
published as Phys.Atom.Nucl.73:138-149,2010 · 13 pages, no figures
The dielectron widths of Υ(nS) (n=1,...,7) and vector decay constants are calculated using the Relativistic String Hamiltonian with a universal interaction. For Υ(nS) (n=1,2,3) the dielectron widths and their ratios are obtained in full agreement with the latest CLEO data. For Υ(10580) and Υ(11020) a good agreement with experiment is reached only if the 4S--3D mixing (with a mixing angle θ=27^∘± 4^∘) and 6S--5D mixing (with θ=40^∘± 5^∘) are taken into account. The possibility to observe higher "mixed D-wave" resonances, Υ(n 3D1) with n=3,4,5 is discussed. In particular, Υ(≈ 11120), originating from the pure 5 3D1 state, can acquire a rather large dielectron width, ∼ 130 eV, so that this resonance may become manifest in the e+e- experiments. On the contrary, the widths of pure D-wave states are very small, Γee(n3 D1) ≤ 2 eV.