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The goal of the DIRAC experiment at CERN is to measure with high precisionthe lifetime of the $\pi^+\pi^-$ atom ($A_{2\pi}$), which is of order$3\times10^{-15}$ s, and thus to determine the s-wave $\pi\pi$-scatteringlengths difference $|a_{0}-a_{2}|$. $A_{2\pi}$ atoms are detected through thecharacteristic features of $\pi^+\pi^-$ pairs from the atom break-up(ionization) in the target. We report on a first high statistics atomic datasample obtained from p Ni interactions at 24 GeV/$c$ proton momentum andpresent the methods to separate the signal from the background.Comment: 19 pages, 12 figures, 1 tabl

Detection of π+π− atoms with the DIRAC spectrometer at CERN

Detection of π⁺π⁻ atoms with the DIRAC spectrometer at CERN