DIRAC Experiment at CERN: Lifetime Measurement of Pionium
Juerg Schacher
Abstract
The DIRAC experiment, a magnetic double arm spectrometer, aims to measure the π+π- atom lifetime with 10% precision, using the high intensity 24 GeV/c proton beam of the CERN Proton Synchrotron. Since the value of this lifetime of order 10-15~s is dictated by strong interaction at low energy, a precise measurement of this quantity enables to study characteristic pion parameters in detail and to submit predictions of QCD to a severe check.
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