The DIRAC experiment at CERN

Abstract

The DIRAC experiment at CERN aims to measure the lifetime of the pionium atom ($A_{2\pi }$), a ${\pi }^{+}{\pi }^{-}$ bound state with an accuracy of 10%. The experimental setup consists of a high precision magnetic double arm spectrometer, located at the high intensity proton beam of the CERN Proton Synchrotron. This measurement will provide - in a model independent way - the S-wave pion scattering length difference $|a_0-a_2|$ with 5% precision.

Comments: Talk presented at the XXXVIIIth Rencontres de Moriond session devoted to QCD and High Energy Hadronic Interactions. We give a status report of the DIRAC experiment and present new analysis results