Abstract
The CMD-3 detector started data taking at the electron-positron collider VEPP-2000 in December 2010 with a goal to collect about 1 fb−1. The collected data sample corresponds to an integrated luminosity of 200 pb−1 in the center-of-mass energy range from 0.32 up to 2 GeV. This paper reports recent results on the hadronic cross sections measurements with the CMD-3 detector.
Highlights
IntroductionIt is free of radiation of the final state particles and its Coulomb interaction, the corresponding Feynman graphs do not contain photon propagators affected by the vacuum polarization effects
The electron-positron collider VEPP-2000 [1] operates at the Budker Institute of Nuclear Physics since December 2010
To study a detector responce and to obtain a registration efficiency, we have developed a Monte Carlo (MC) simulation of our detector based on GEANT4 package, and all simulated events pass all our reconstruction and selection procedures
Summary
It is free of radiation of the final state particles and its Coulomb interaction, the corresponding Feynman graphs do not contain photon propagators affected by the vacuum polarization effects These advantages are the main motivation to exploit this process as an independent tool for luminosity. 3.1 Study of the processes e+e− → KS KL and e+e− → K+K− It is known the CMD-2 and BaBar results for cross sections at the φ-peak region disagree at the level ∼4% for charged channel, so a new measurement are required. The cross section measurement of the process e+e− → K+K−π+π− is based on the integrated luminosity of 22 pb−1 in the c.m. energy range from 1.5 to 2.0 GeV and early was measured by the BaBar via ISR. More detail analyses can be found in publication [12]
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