Is the scalar meson seen in CELLO data on $γγ\rightarrowπ^+π^-$ ?

Details Is the scalar meson seen in CELLO data on $γγ\rightarrowπ^+π^-$ ? Is the scalar meson seen in CELLO data on $γγ\rightarrowπ^+π^-$ ?

1993-06-09

arxiv.org/abs/hep-ph/9306249v1

Phys.Atom.Nucl. 56 (1993) 1417-1420; Yad.Fiz. 56N10 (1993) 203-209

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 9 pages, 4 figures (not included, hard copy available upon request), ISU-IAP.Th93-04,\ Irkutsk

Scientific paper

We analyze the CELLO angular distributions $\gamma\gamma\rightarrow\pi^+\pi^-$ with the unitary model \cite{KS-86} for helicity 2 amplitude. In contrast to previous analysis \cite{CELLO} we do not see any QED damping. The obtained S--wave does not contradict to low--energy theorem and demonstrates more clealy the resonance--like behaviour near 1.3 Gev.

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