Updated measurement of the e+e−→ωπ0→

Measurement of the e+e−→π0γ cross section in the energy range 1.075–2 GeV at SND

“…The latter background is estimated using MC simulation and cross-section data obtained in Ref. [12]. Its fraction does not exceed 2% of the total background.…”

Low-energy process e+e−→K+K− in the extended Nambu–Jona-Lasinio model

“…In studying of this process, we take into account the contact terms when the pairs K + K − are generated by an intermediate photon, and processes with intermediate vector mesons ρ, ω and φ in the ground and in the first radially excited states. The results obtained here are compared with experimental data recently received in Novosibirsk and in Stanford.Recently, great attention has been paid to the experimental study of the production of charged kaon pairs in colliding electron-positron beams in the energy range 1 -2 GeV at the Budker Institute of Nuclear Research (Novosibirisk) [1,2,3,4,5] and in the SLAC National Accelerator Laboratory (Stanford) [6]. For a theoretical description of this process in the lowenergy region, unfortunately, we can not use the QCD perturbation theory, but here we can successfully apply various phenomenological models based, as a rule, on the chiral symmetry of strong interactions.…”

Measurement of the e+e−→KSKLАчасов1, Aulchenko2, Barnyakov3 et al. 2018Phys. Rev. DSelf Cite14060View full textAdd to dashboardCite

“…To do this, e þ e − → ωπ 0 → π 0 π 0 γ → 5γ events are used, which can be selected without background [12]. The dependence of the photon loss due to the "good" photon requirement on the photon energy is measured in data and simulation.…”

“…The accuracy of the luminosity measurement using e þ e − → γγ was studied in Ref. [12] and is estimated to be 1.4%.…”

“…[12,17] using e þ e − → ωπ 0 → π 0 π 0 γ events. We estimate that the systematic uncertainty due to conditions on invariant masses and χ 2 of the kinematic fit does not exceed 5%.…”