Measurement of the $e^+e^- \to \eta\pi^+\pi^-$ cross section with the SND detector at the VEPP-2000 collider

The e+e-→ηπ+π- cross section is measured at the Spherical Neutral Detector (SND) detector in the η decay mode η→3π0. The analysis is based on the data sample with an integrated luminosity of 32.7 pb-1 collected at the VEPP-2000 e+e- collider in the center-of-mass energy range s=1.075–2.000 GeV. The data obtained in the η→3π0 decay mode are found to be in agreement with the previous SND measurements in the η→γγ mode. Therefore the measurements in the two modes are combined.

Note:

8 pages, 5 figures

electron positron: annihilation
electron positron: colliding beams
pi: pair production
eta: associated production
channel cross section: measured
eta: hadronic decay
SND
Novosibirsk VEPP-2000
eta: decay modes
experimental results

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