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Observation of e+e−→ ηψ(2S) at center-of-mass energies from 4.236 to 4.600 GeV
Observation of e+e−→ ηψ(2S) at center-of-mass energies from 4.236 to 4.600 GeV
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Observation of e+e−→ ηψ(2S) at center-of-mass energies from 4.236 to 4.600 GeV
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Observation of e+e−→ ηψ(2S) at center-of-mass energies from 4.236 to 4.600 GeV
Observation of e+e−→ ηψ(2S) at center-of-mass energies from 4.236 to 4.600 GeV

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Observation of e+e−→ ηψ(2S) at center-of-mass energies from 4.236 to 4.600 GeV
Observation of e+e−→ ηψ(2S) at center-of-mass energies from 4.236 to 4.600 GeV
Journal Article

Observation of e+e−→ ηψ(2S) at center-of-mass energies from 4.236 to 4.600 GeV

2021
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Overview
A bstract Using a total of 5 . 25 fb − 1 of e + e − collision data with center-of-mass energies from 4.236 to 4.600 GeV, we report the first observation of the process e + e − → ηψ (2 S ) with a statistical significance of 4.9 standard deviations. The data sets were collected by the BESIII detector operating at the BEPCII storage ring. We measure the yield of events integrated over center-of-mass energies and also present the energy dependence of the measured cross section.