A. Sibidanov

Quest for precision in hadronic cross sections at low energy: Monte Carlo tools vs. experimental data

We present the achievements of the last years of the experimental and theoretical groups working on hadronic cross section measurements at the low-energy e+e− colliders in Beijing, Frascati, Ithaca, Novosibirsk, Stanford and Tsukuba and on τ decays. We sketch the prospects in these fields for the years to come. We emphasise the status and the precision of the Monte Carlo generators used to analyse the hadronic cross section measurements obtained as well with energy scans as with radiative return, to determine luminosities and τ decays. The radiative corrections fully or approximately implemented in the various codes and the contribution of the vacuum polarisation are discussed.

Measurement of sigma(e(+)e(-) -> pi(+)pi(-)gamma) and extraction of sigma(e(+)e(-) -> pi(+)pi(-)) below 1 GeV with the KLOE detector

We have measured the cross section

Data handling, reconstruction, and simulation for the KLOE experiment

sigma(e^+e^-to pi^+pi^- gamma)

Determination of η → π+π−π0 Dalitz plot slopes and asymmetries with the KLOE detector

at an energy

Study of the process e+e−→ωπ0 in the ϕ -meson mass region with the KLOE detector

W=m_phi=1.02

Measurement of σ(e + e − → π + π − γ) and extraction of σ(e + e − → π + π − ) below 1 GeV with the KLOE detector

GeV with the KLOE detector at the electron-positron collider DA

Measurement of the leptonic decay widths of the ϕ-meson with the KLOE detector

Phi

Precision measurement of the KS meson lifetime with the KLOE detector

NE. From the dependence of the cross section on the invariant mass of the two-pion system, we extract

Measurement of the K(S) ---> gamma gamma branching ratio using a pure K(S) beam with the KLOE detector.

sigma(e^+e^-to pi^+pi^-)

Measurement of

for the mass range