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Ablikim, M
Physical review. D, 08/2021, Letnik: 104, Številka: 3Journal Article
The process e+e− → ϕη is studied at 22 center-of-mass energy points (√s) between 2.00 and 3.08 GeV using 715 pb−1 of data collected with the BESIII detector. The measured Born cross section of e+e− → ϕη is found to be consistent with BABAR measurements, but with improved precision. A resonant structure around 2.175 GeV is observed with a significance of 6.9 σ with mass (2163.5 ± 6.2 ± 3.0) MeV/c2 and width (31.1+21.1−11.6 ± 1.1) MeV, where the first uncertainties are statistical and the second are systematic.
