Shape of the $f_0(980)$ in $γγ\toπ^+π^-$
| dc.creator | Achasov, N. N. | |
| dc.creator | Shestakov, G. N. | |
| dc.date | 2005-06-06 | |
| dc.date | 2005-07-25 | |
| dc.date.accessioned | 2026-07-07T10:29:32Z | |
| dc.date.available | 2026-07-07T10:29:32Z | |
| dc.description | The Belle Collaboration results on the observation of the $f_0(980)$ resonance in the reaction $γγ\toπ^+π^-$ are analyzed. It is argued that they point to the presence of mechanisms which give rise to a strong distortion of the $f_0(980)$ resonance shape in comparison with the shape of a solitary Breit-Wigner resonance. It is shown that the main factors responsible for the formation of the specific, steplike, shape of the $f_0(980)$ resonance in the $γγ\toπ^+π^-$ reaction cross section are the $K^+K^-$ loop mechanism of the $f_0(980)$ coupling to the $γγ$ system and the destructive interference between the background and $f_0(980)$ resonance contributions in the $π^+π^-$ invariant mass region below the $K^+K^-$ threshold. | |
| dc.description | 10 pages, 6 figures, published version | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0506046 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0506046 | |
| dc.identifier | Phys.Rev.D72:013006,2005 | |
| dc.identifier | doi:10.1103/PhysRevD.72.013006 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/177832 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Experiment | |
| dc.subject | Nuclear Experiment | |
| dc.subject | Nuclear Theory | |
| dc.title | Shape of the $f_0(980)$ in $γγ\toπ^+π^-$ | |
| dc.type | text |