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Measurement of the e+e- →ηπ+π- cross section with the SND detector at the VEPP-2000 collider

Achasov M. N., Barnyakov A. Yu, Beloborodov K. I., Berdyugin A. V., Berkaev D. E., Bogdanchikov A. G., Botov A. A., Dimova T. V., Druzhinin V. P., Golubev V. B., Kardapoltsev L. V., Kharlamov A. G., Koop I. A., Korol A. A., Kovrizhin D. P., Koshuba S. V., Kupich A. S., Lysenko A. P., Martin K. A., Melnikova N. A., Muchnoi N. Yu, Obrazovsky A. E., Pakhtusova E. V., Perevedentsev E. A., Pugachev K. V., Rogozina E. V., Serednyakov S. I., Silagadze Z. K., Shatunov Yu M., Shatunov P. Yu, Shtol D. A., Surin I. K., Tikhonov Yu A., Usov Yu V., Vasiljev A. V., Zemlyansky I. M.

© 2018 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP 3 . 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.