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Measurement of branching fractions for ψ (3686) →γη', γη, and γπ0 M. Ablikim, M. N. Achasov, S. Ahmed [et al.]

Contributor(s): Achasov, M. N | Ahmed, S | Chelkov, G. A | Ablikim, MMaterial type: ArticleArticleSubject(s): BESIII, детектор | BEPCII, коллайдер | столкновение частицGenre/Form: статьи в журналахOnline resources: Click here to access online In: Physical Review D Vol. 96, № 5. P. 052003-1-052003-9Abstract: Using a data sample of 448×106  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±0.18±0.05)×10−6 and B(ψ(3686)→γπ0)=(0.95±0.16±0.05)×10−6. In addition, we measure the branching fraction of ψ(3686)→γη′ to be B(ψ(3686)→γη′)=(125.1±2.2±6.2)×10−6, which represents an improvement of precision over previous results.
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Using a data sample of 448×106  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±0.18±0.05)×10−6 and B(ψ(3686)→γπ0)=(0.95±0.16±0.05)×10−6. In addition, we measure the branching fraction of ψ(3686)→γη′ to be B(ψ(3686)→γη′)=(125.1±2.2±6.2)×10−6, which represents an improvement of precision over previous results.

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