New results on e+e- -> hadrons exclusive cross sections from experiments with SND detector at VEPP-2M e+e- collider in the energy range sqrt(s)=0.4-1.4 GeV

TL;DR

This paper presents new precise measurements of various hadronic cross sections in e+e- collisions within 0.4-1.4 GeV, improving accuracy for muon g-2 calculations based on data from the SND detector at VEPP-2M.

Contribution

It provides the most accurate cross section measurements for key processes in the 0.4-1.4 GeV energy range, enhancing existing experimental data.

Findings

Measurement accuracy is close to or better than the world average.

For e+e- -> pi+pi-, the accuracy is about 0.01.

Results are significant for calculating the hadronic contribution to muon g-2.

Abstract

New results of the e+e- -> pi+pi-, K+K-, K_SK_L, pi0/gamma, eta0/gamma processes cross section measurements are presented. The results are based on the 30 pb^-1 data, accumulated by SND detector at VEPP-2M e+e- collider in the energy range sqrt(s)=0.4-1.4 GeV during 1995-2000 years. The comparison with existing experimental data shows that the measurement accuracy is close to or better than the world average. For the e+e- -> pi+pi- process the accuracy is about 0.01. This is important for calculation of hadronic contribution into the muon anomalous magnetic moment.