Shape of the f0(980) in γγ→π+π-
Abstract
The Belle Collaboration results on the observation of the f0(980) resonance in the reaction γγ→π+π- are analyzed. It is argued that they point to the presence of mechanisms which give rise to a strong distortion of the f0(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 f0(980) resonance in the γγ→π+π- reaction cross section are the K+K- loop mechanism of the f0(980) coupling to the γγ system and the destructive interference between the background and f0(980) resonance contributions in the π+π- invariant mass region below the K+K- threshold.
- Publication:
-
Physical Review D
- Pub Date:
- July 2005
- DOI:
- arXiv:
- arXiv:hep-ph/0506046
- Bibcode:
- 2005PhRvD..72a3006A
- Keywords:
-
- 13.40.-f;
- 13.60.Le;
- 13.75.Lb;
- Electromagnetic processes and properties;
- Meson production;
- Meson-meson interactions;
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment;
- Nuclear Experiment;
- Nuclear Theory
- E-Print:
- 10 pages, 6 figures, published version