Using a data sample of 1.31×109 J/ψ events collected with the BESIII detector, a search for η′→γγη via J/ψ→γη′ is performed for the first time. No significant η′ signal is observed in the γγη invariant mass spectrum, and the branching fraction of η′→γγη is determined to be less than 1.33×10-4 at the 90% confidence level.

Search for the decay η′ →γγη

Alekseev M.;Amoroso A.;Bianchi F.;Destefanis M.;De Mori F.;Greco M.;Lavezzi L.;Maggiora M.;Marcello S.;Sosio S.;Spataro S.;Yan L.;
2019-01-01

Abstract

Using a data sample of 1.31×109 J/ψ events collected with the BESIII detector, a search for η′→γγη via J/ψ→γη′ is performed for the first time. No significant η′ signal is observed in the γγη invariant mass spectrum, and the branching fraction of η′→γγη is determined to be less than 1.33×10-4 at the 90% confidence level.
2019
100
5
1
7
http://harvest.aps.org/bagit/articles/10.1103/PhysRevD.100.052015/apsxml
Ablikim M.; Achasov M.N.; Adlarson P.; Ahmed S.; Albrecht M.; Alekseev M.; Amoroso A.; An F.F.; An Q.; Bai Y.; Bakina O.; Ferroli R.B.; Balossino I.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1731343
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