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- Title
On the high-statistics investigation of the a<sub>0</sub>(980) resonance in the γγ → π<sup>0</sup>η reaction.
- Authors
Achasov, N. N.; Shestakov, G. N.
- Abstract
High-statistics data on the γγ → π0η reaction will make it possible to conclude whether the K+ K−-loop rescattering mechanism, γγ → K+ K− → a0(980) → π0η, is the main mechanism of the production of a0(980) isovector resonance. This mechanism provides a reasonable value of 20–30 nb at the maximum for the manifestation of a0(980) in the γγ → π0η cross section. It also gives rise to a noticeable narrowing of the a0(980) peak to its effective (observed) width ≈20–30 MeV in the γγ → π0η channel. The decay width averaged over the resonance mass distribution is 〈Γα0 → K+ K− → γγ〉πη ≈ 0.13 keV. The experimental confirmation of this scenario would be important evidence in favor of the q2 $$ \bar q $$2 nature of light scalar mesons.
- Subjects
RESONANCE; DATA analysis; HADRONS; MESONS; MUONS
- Publication
JETP Letters, 2009, Vol 90, Issue 5, p313
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364009170019