The decays ψ′→γπ0, γη and γη′ are studied using data collected with the BESIII detector at the BEPCII e+e- collider. The processes ψ′→γπ0 and ψ′→γη are observed for the first time with signal significances of 4.6σ and 4.3σ, respectively. The branching fractions are determined to be B(ψ′→γπ0)=(1.58±0.40±0.13)×10-6, B(ψ′→γη)=(1.38±0.48±0.09)×10-6, and B(ψ′→γη′)=(126±3±8)×10-6, where the first errors are statistical and the second ones systematic.
Evidence for ψ′ Decays into γπ0 and γη
DESTEFANIS, MARCO GIOVANNI;GRECO, Michela;MAGGIORA, MARCO;SPATARO, STEFANO GIOVANNI;
2010-01-01
Abstract
The decays ψ′→γπ0, γη and γη′ are studied using data collected with the BESIII detector at the BEPCII e+e- collider. The processes ψ′→γπ0 and ψ′→γη are observed for the first time with signal significances of 4.6σ and 4.3σ, respectively. The branching fractions are determined to be B(ψ′→γπ0)=(1.58±0.40±0.13)×10-6, B(ψ′→γη)=(1.38±0.48±0.09)×10-6, and B(ψ′→γη′)=(126±3±8)×10-6, where the first errors are statistical and the second ones systematic.
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