Evidence for exclusive ηc production in γγ interactions
1986
Abstract We observe for evidence for γγ → η c production in the reaction e + e − → e + e − K S 0 K ± π ∓ . The product Γ γγ ( η c )· B ( η c → K S 0 K ± π ∓ ) is measured to be 0.5 −0.15 +0.2 ±0.1 keV.
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