Measurement of the $e^+e^- \to Ïη$ cross section below $\sqrt{s}=2$ GeV
arXiv:1607.00371 · doi:10.1103/PhysRevD.94.092002
Abstract
The cross section for the process $e^+e^- \to Ïη$ is measured in the center-of-mass energy range 1.34--2.00 GeV. The analysis is based on data collected with the SND detector at the VEPP-2000 $e^+e^-$ collider. The measured $e^+e^- \to Ïη$ cross section is the most accurate to date. A significant discrepancy is observed between our data and previous BABAR measurement.
15 pages, 5 figures, 3 tables