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Measurement of branching fractions for psi(3686) -> gamma eta ', gamma eta, and gamma pi(0)

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Tapan, İlhan

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Amer Phyical

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Using a data sample of 448 x 10(6) psi(3686) events collected with the BESIII detector operating at the BEPCII storage ring, the decays psi(3686) -> gamma eta and psi(3686) -> gamma pi(0) are observed with a statistical significance of 7.3 sigma and 6.7 sigma, respectively. The branching fractions are measured to be B(psi(3686) -> gamma eta) = (0.85 +/- 0.18 +/- 0.05) x 10(-6) and B(psi(3686) ->gamma pi(0)) = (0.95 +/- 0.16 +/- 0.05) x 10(-6). In addition, we measure the branching fraction of psi(3686) -> gamma eta' to be B(psi(3686) -> gamma eta') = (125.1 +/- 2.2 +/- 6.2)x10(-6), which represents an improvement of precision over previous results.

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Astronomy & astrophysics, Physics, Pseudoscalar mesons

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Ablikim, M. vd. (2017). ''Measurement of branching fractions for psi(3686) -> gamma eta ', gamma eta, and gamma pi(0)''. Physical Review D, 96(5).

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