Using (1310.6±7.0)×106 J/ψ events acquired with the BESIII detector at the BEPCII storage rings, the decay η′→π+π-μ+μ- is observed for the first time with a significance of 8σ via the process J/ψ→γη′. We measure the branching fraction of η′→π+π-μ+μ- to be B(η′→π+π-μ+μ-)=(1.97±0.33(stat)±0.19(syst))×10-5, where the first and second uncertainties are statistical and systematic, respectively.

Observation of η′→π+π−μ+μ−

Garzia, I.;
2021

Abstract

Using (1310.6±7.0)×106 J/ψ events acquired with the BESIII detector at the BEPCII storage rings, the decay η′→π+π-μ+μ- is observed for the first time with a significance of 8σ via the process J/ψ→γη′. We measure the branching fraction of η′→π+π-μ+μ- to be B(η′→π+π-μ+μ-)=(1.97±0.33(stat)±0.19(syst))×10-5, where the first and second uncertainties are statistical and systematic, respectively.
2021
Ablikim, M.; Achasov, M.  N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Amoroso, A.; An, Q.; Bai, X.  H.; Bai, Y.; Bakina, O.; Ferroli, R. Baldini; Balos...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2505993
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