Determination of $ππ$ scattering lengths from measurement of $π^+π^-$ atom lifetime

Details Determination of $ππ$ scattering lengths from measurement of $π^+π^-$ atom lifetime Determination of $ππ$ scattering lengths from measurement of $π^+π^-$ atom lifetime

2011-09-02

arxiv.org/abs/1109.0569v2

Physics Letters B 704 (2011) 24

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 6 figures

Scientific paper

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 atomic pairs, a 4% measurement of the S-wave $\pi\pi$ scattering length difference $|a_0-a_2| = (.0.2533^{+0.0080}_{-0.0078}|_\mathrm{stat}.{}^{+0.0078}_{-0.0073}|_\mathrm{syst})M_{\pi^+}^{-1}$ has been attained, providing an important test of Chiral Perturbation Theory.

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