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

A. E. Kaloshin·V. M. Persikov
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Abstract

We analyze the CELLO angular distributions $γγ\rightarrowπ^+π^-$ 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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A. E. Kaloshin, V. M. Persikov. 1993-06-09. Is the scalar meson seen in CELLO data on $γγ\rightarrowπ^+π^-$ ?. https://arxiv.org/abs/hep-ph/9306249

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