Study of the process e+e−→K+K−η with the CMD-3 detector at the VEPP-2000 collider
Date
2019
Authors
Ivanov, V.L.
Fedotovich, G.V.
Akhmetshin, R.R.
Amirkhanov, A.N.
Anisenkov, A.V.
Aulchenko, V.M.
Banzarov, V.Sh.
Bashtovoy, N.S.
Berkaev, D.E.
Bondar, A.E.
Journal Title
Journal ISSN
Volume Title
Publisher
Physics Letters B
Abstract
The process e+e− K + K −η has been studied in the center-of-mass energy range from 1.59 to
2.007 GeV using the data sample of 59.5 pb−1, collected with the CMD-3 detector at the
VEPP-2000 e+e− collider in 2011, 2012 and 2017. The K + K −η final state is found to
be dominated by the contribution of the φ(1020)η intermediate state. The cross section of
the process e+e− φ(1020)η has been measured with a systematic uncertainty of 5.1% on the
base of 3009 67 selected events. The obtained cross section
has been used to calculate the contribution to the anomalous magnetic moment of the
muon: aφη(E <
1.8 GeV) = (0.321 ± 0.015stat ± 0.016syst) × 10−10, aφη(E < 2.0 GeV) = (0.440 ± 0.015stat ±
0.022syst) ×
10−10. From the cross section approximation the φ(1680) meson parameters have been determined with
better statistical precision, than in previous studies.
Description
Keywords
Citation
Ivanov, V.L. … Sibidanov, A.L., Solodov, E.P, Timoshenko, M.V., Titov, V.M., Talyshev, A.A., Tolmachev, S.S., Vorobiov, A.I, Yudin, Yu.V. (2019). Study of the process e+e−→K+K−η with the CMD-3 detector at the VEPP-2000 collider. Physics Letters B, 798, 134946. https://doi.org/10.1016/j.physletb.2019.134946