Study of the e+e- -> hadrons reactions with CMD-3 detector at VEPP-2000 collider

Abstract

The CMD-3 detector is taking data at the VEPP-2000 e + e − collider (Budker INP, Novosibirsk, Russia). The main goal of experiments with CMD-3 is the measurement of the cross-sections and dynamics of the exclusive modes of e + e − annihilation to hadrons. In particular, these results provide an important input for calculations of the hadronic contribution to the muon anomalous magnetic moment. The first round of data taking with the CMD-3 detector was performed in 2011-2013 with about 60 1/pb integrated luminosity in the center-of-mass (c.m.) energy range from 0.32 to 2.0 GeV. The collected data sample exceeds those in all previous experiments. Here we present the survey of results of data taken in 2011-2013, including a precise measurement of the e + e − → π + π − reaction as well as other hadron final states with up to six pions or states including two kaons. At the end of 2016 the VEPP-2000 collider resumed operation after upgrade of the injection system, and performance approaching the project luminosity of 10 32 cm −2 s −1 at 2 GeV has been demonstrated. Preliminary results of the new 2017 run are also presented.

The muong−2: a brief overview of hadronic crosssection data

“…The CMD-3 experimental programme has already published cross section measurements for many final states (see e.g. [19][20][21]). Of these, major improvements have been seen in the measurements of the KK cross sections, with both the K + K − [22] and K 0 S K 0 L [23] analyses yielding very precise results of the narrow φ resonance that dominates in both these channels.…”

Fine structure of the cross sections of e+e− annihilation near the thresholds of pp¯ and nnMilstein1, Salnikov2 2018Nuclear Physics A242321View full textAdd to dashboardCite

“…At present, the CMD-3 detector at the VEPP-2000 collider collects the data on the production of pp pair in e + e − annihilation at energies only slightly higher than the pair production threshold [28]. In particular, the energy resolution of this facility allows one to obtain the data between the thresholds of pp and nn pair production.…”