First measurement of the ${\pi }^{+}{\pi }^{-}$ atom lifetime

Abstract

The goal of the DIRAC experiment at CERN (PS212) is to measure the ${\pi }^{+}{\pi }^{-}$ atom lifetime with 10% precision. Such a measurement would yield a precision of 5% on the value of the $S$-wave $\pi \pi$ scattering lengths combination $|a_0-a_2|$. Based on part of the collected data we present a first result on the lifetime, $\tau =[2.91_{-0.62}^{+0.49}]\times 10^{-15}$ s, and discuss the major systematic errors. This lifetime corresponds to $|a_0-a_2|=0.264_{-0.020}^{+0.033}{m}_{\pi }^{-1}$.

18 pages, 6 figures

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