Detection of $π^+π^-$atoms with the DIRAC spectrometer at CERN

Details Detection of $π^+π^-$atoms with the DIRAC spectrometer at CERN Detection of $π^+π^-$atoms with the DIRAC spectrometer at CERN

2004-09-24

arxiv.org/abs/hep-ex/0409053v2

J.Phys.G30:1929-1946,2004

Physics

High Energy Physics

High Energy Physics - Experiment

19 pages, 12 figures, 1 table

Scientific paper

10.1088/0954-3899/30/12/012

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 $3\times10^{-15}$ s, and thus to determine the s-wave $\pi\pi$-scattering lengths difference $|a_{0}-a_{2}|$. $A_{2\pi}$ atoms are detected through the characteristic features of $\pi^+\pi^-$ pairs from the atom break-up (ionization) in the target. We report on a first high statistics atomic data sample obtained from p Ni interactions at 24 GeV/$c$ proton momentum and present the methods to separate the signal from the background.

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