2010/02/05 by Hong-Wei Ke, Ke, Hong-Wei, Xue-Qian Li +3 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.1002.1187
7 pages, 4 figures; Rectification made and a footnote added
openalex publication_date 2010/02/05 · arxiv created 2010/03/01 · arxiv updated 2010/03/01 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28
In this work, we investigate the characteristics of the spin-singlet state ηb of the bottomonia family via the radiative decays of Υ(nS)→ ηb+γ. The theoretical estimation of the decay widths is carried out in terms of the light-front quark model (LFQM). Recently CLEO and BaBar collaborations have measured B(Υ(3S)→γηb) and the mass of ηb. In terms of the data we fix the concerned input parameters in our calculations of Υ(nS)→ ηb+γ. A special attention is paid on the transition of Υ(5S)→ ηb+γ. The BELLE data showed that the width of Υ(5S)→ Υ(2S,1S)+ππ is two orders larger than that of Υ(4S)→ Υ(2S,1S)+ππ, thus some theoretical explanations have been proposed. Among them, it is suggested the inelastic final state interaction (IFSI) Υ(5S)→ B B→ Υ(1S)+ππ may be a natural one. If so, a similar mechanism also applies to Υ(5S)→ B(*) B(*)→ ηb+γ, the precise measurement would serve as a good test whether Υ(5S) possess exotic components. Our calculation in the LFQM indicates that the rate of the direct process Υ(5S)→ηb+γ is not anomalous compared to Υ(mS)→ηb+γ(m=1,2,3,4), thus if the IFSI does apply, the rate of Υ(5S)→ηb+γ should be larger than the others by orders.