Search for the decay η′ → γγη
Search for the decay η′ → γγη
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DOI:
10.1103/physrevd.100.052015
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发表时间:
2019-09-30
影响因子:
5
通讯作者:
Zou, J. H.
中科院分区:
文献类型:
--
作者:
Ablikim, M.;Achasov, M. N.;Zou, J. H.
Using a data sample of 1.31 x 10(9) J/psi events collected with the BESIII detector, a search for eta' -> gamma gamma eta via J/psi ->gamma eta' is performed for the first time. No significant eta' signal is observed in the gamma gamma eta invariant mass spectrum, and the branching fraction of eta' -> gamma gamma eta is determined to be less than 1.33 x 10(-4) at the 90% confidence level.