Study of the process e(+)e(-) -> phi eta at center-of-mass energies between 2.00 and 3.08 GeV
Citation
Ablikim, M., Achasov, M. N., Adlarson, P., Ahmed, S., Albrecht, M., Aliberti, R., ... & Koch, L. (2021). Study of the process e+ e−→ ϕ η at center-of-mass energies between 2.00 and 3.08 GeV. Physical Review D, 104(3), 032007Abstract
The process e(+)e(-) -> phi eta is studied at 22 center-of-mass energy points (root 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(-) -> phi eta 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 sigma with mass (21635 +/- 6.2 +/- 3.0) MeV/c(2) and width (31.1(-11.6)(+21.1) +/- 1.1) MeV, where the first uncertainties are statistical and the second are systematic.
