Analysis of the CMD-3 detector data: selection of low-energy electron-positron annihilation into KKππ⁰

Abstract

We explore the process e+e− → KSK+-π−+π0 with the CMD-3 detector at the electron-positron collider VEPP-2000. Here, we present a selection algorithm. The data amassed by the CMD-3 detector in the energy range of 1.2–2 GeV during 2011, 2012, 2017, 2019 runs, with a total luminosity integral of ∼120pb−1 backs the analysis. Two reasons stand behind the study. First, a recent report of anomalous magnetic moment discrepancy broadening to 4.2σ, see Fermilab article [1]. Searching for New Physics demand sharper Hadronic Vacuum Polarization (HVP) estimate. In its turn, HVP computation relies heavily on hadronic cross-sections measurement. Second, an intermediate vector resonance near 2 GeV (ϕ’’) is still a mystery. It might be a s s − state, or a hybrid s s − g , or ΛΛ− state. Untangling partial decay widths, measuring isospin 1 and 0 cross-sections for e+e− → KSK+-π−+π0, might discern between different ϕ’’ models.