Determination of $\pi \pi$ scattering lengths from measurement of ${\pi }^{+}{\pi }^{-}$ atom lifetime

B. Adeva, L. Afanasyev, M. Benayoun +92

The DIRAC experiment at CERN has achieved a sizeable production of ${\pi }^{+}{\pi }^{-}$ atoms and has significantly improved the precision on its lifetime determination. From a sample of 21227…