Detection of ${\pi }^{+}{\pi }^{-}$atoms with the DIRAC spectrometer at CERN

The DIRAC collaboration

The goal of the DIRAC experiment at CERN is to measure with high precision the lifetime of the ${\pi }^{+}{\pi }^{-}$ atom ($A_{2\pi }$), which is of order $3\times 10^{-15}$ s, and thus to determin…