Using a data sample of 448 × 10^6 ψ(3686) events collected with the BESIII detector operating at the BEPCII storage ring, the decays ψ(3686) → γη and ψ(3686) → γπ0 are observed with a statistical significance of 7.3σ and 6.7σ, respectively. The branching fractions are measured to be B(ψ(3686) → γη) = (0.85 pm 0.18 pm 0.05) × 10−6 and B(ψ(3686) → γπ0) = (0.95 pm 0.16 pm 0.05) × 10−6. In addition, we measure the branching fraction of ψ(3686) → γη0 to be B(ψ(3686)→γη0) = (125.1 pm 2.2 pm 6.2) × 10−6, which represents an improvement of precision over previous results.

Measurement of branching fractions for ψ(3686)→γη′, γη, and γπ0

FARINELLI, Riccardo;GARZIA, Isabella;MEZZADRI, Giulio;
2017

Abstract

Using a data sample of 448 × 10^6 ψ(3686) events collected with the BESIII detector operating at the BEPCII storage ring, the decays ψ(3686) → γη and ψ(3686) → γπ0 are observed with a statistical significance of 7.3σ and 6.7σ, respectively. The branching fractions are measured to be B(ψ(3686) → γη) = (0.85 pm 0.18 pm 0.05) × 10−6 and B(ψ(3686) → γπ0) = (0.95 pm 0.16 pm 0.05) × 10−6. In addition, we measure the branching fraction of ψ(3686) → γη0 to be B(ψ(3686)→γη0) = (125.1 pm 2.2 pm 6.2) × 10−6, which represents an improvement of precision over previous results.
2017
Ablikim, M.; Achasov, M.  . n.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, F.  . f.; An, Q.; Bai, J.  . z.; Bai, Y.; Bakina, O.; Baldini ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2375846
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