Abstract
At the end of 2016 the SND detector resumed data taking at the upgraded VEPP-2000 e+e− collider. The analysis of data accumulated in 2010-2013 with an integrated lumonosity of 70 pb−1 is continuing. Recent results on measurements of various hadronic cross sections are presented.
Highlights
The SND [1,2,3,4] is the general purpose nonmagnetic detector
The most accurate data on this process were obtained in experiments at the VEPP-2M e+e− collider with the SND [7, 8] and CMD-2 [9] detectors
The measured e+e− → π0γ cross section shown in Fig. 1 agrees with previous SND [7, 8] and CMD-2 [9] measurements within the systematic uncertainties, but is significantly more precise
Summary
The SND [1,2,3,4] is the general purpose nonmagnetic detector. Its main part is a spherical three-layer electromagnetic calorimeter containing 1640 NaI(Tl) crystals. At VEPP-2M, data with an integrated luminosity of about 30 pb−1 were recorded in 1996-2000 in the energy range 0.4– 1.4 GeV. The main goal of the SND experiments is careful measurement of exclusive hadronic cross sections below 2 GeV, which are, in particular, needed for the Standard Model calculation of the muon (g − 2) and running αQED.
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