Amplitude Analysis of High Statistics Results on $γγ\toπ^+π^-$ and the Two Photon Width of Isoscalar States

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dc.creatorPennington, M. R.
dc.creatorMori, T.
dc.creatorUehara, S.
dc.creatorWatanabe, Y.
dc.date2008-03-24
dc.date2008-05-28
dc.date.accessioned2026-07-07T11:33:19Z
dc.date.available2026-07-07T11:33:19Z
dc.descriptionWe perform an Amplitude Analysis of the world published data on $γγ\toπ^+π^-$ and $π^0π^0$. 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 $Γ(f_0(980)\toγγ) = 0.42$ and 0.10 keV, and $Γ(f_2(1270)\toγγ) = 3.14 \pm 0.20$ and $3.82 \pm 0.30$ 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 ${\bar K}K$, ${\bar s}s$ or ${\bar{qq}}qq$. Presently available data cannot yet distinguish unambiguously between these predictions. However, we show how forthcoming results on $γγ\toπ^0π^0$ can not only discriminate between, but also refine, these classes of partial wave solutions.
dc.description34 pages, 23 figures. Version with minor changes to be published in European Journal of Physics C
dc.identifierhttps://arxiv.org/abs/0803.3389
dc.identifierhttp://arxiv.org/abs/0803.3389
dc.identifierEur.Phys.J.C56:1-16,2008
dc.identifierdoi:10.1140/epjc/s10052-008-0648-9
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/197851
dc.subjectHigh Energy Physics - Phenomenology
dc.titleAmplitude Analysis of High Statistics Results on $γγ\toπ^+π^-$ and the Two Photon Width of Isoscalar States
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