Using a data sample of 448.1 × 10 ψð3686Þ events collected at s 1⁄4 3.686 GeV with the BESIII detector at the Beijing Electron-Positron Collider II, we search for the rare decay J=ψ → φeþe− via ψð3686Þ → πþπ−J=ψ. No signal events are observed and the upper limit on the branching fraction is set to be BðJ=ψ → φeþe−Þ < 1.2 × 10−7 at the 90% confidence level, which is still about one order of magnitude higher than the Standard Model prediction.

Search for rare decay J/ψ→ϕe+e−

Cibinetto, G.;Farinelli, R.;Garzia, I.;Mezzadri, G.;Savrié, M.;
2019

Abstract

Using a data sample of 448.1 × 10 ψð3686Þ events collected at s 1⁄4 3.686 GeV with the BESIII detector at the Beijing Electron-Positron Collider II, we search for the rare decay J=ψ → φeþe− via ψð3686Þ → πþπ−J=ψ. No signal events are observed and the upper limit on the branching fraction is set to be BðJ=ψ → φeþe−Þ < 1.2 × 10−7 at the 90% confidence level, which is still about one order of magnitude higher than the Standard Model prediction.
2019
Ablikim, M.; Achasov, M.  N.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, F.  F.; An, Q.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Ban, Y...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2403865
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