2008/03/31 by M. R. Pennington, T. Mori, S. Uehara +1 · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-008-0648-9
published as Eur.Phys.J.C56:1-16,2008 · 34 pages, 23 figures. Version with minor changes to be published in European Journal of Physics C
arxiv created 2008/05/28 · openalex publication_date 2008/06/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We perform an amplitude analysis of the world published data on γγ→π + π - and π 0 π 0 . These are dominated in statistics by the recently published results from Belle on the charged pion channel. Nevertheless, having only limited angular information, a range of solutions remain possible. We present two solutions with Γ(f 0 (980)→γγ)=0.42 and 0.10 keV, and Γ(f 2 (1270)→γγ)=3.14±0.20 and 3.82 ± 0.30 keV, respectively: the former being the solution favoured by χ 2 , the latter at the edge of acceptability. Models of the structure of the f 0 (980) predict two photon widths to be between 0.2 and 0.6 keV, depending on its composition as mainly K̄K, s̄s or qq̄qq. Presently available data cannot yet distinguish unambiguously between these predictions. However, we show how forthcoming results on γγ→π 0 π 0 can not only discriminate between, but also refine, these classes of partial wave solutions.