The investigation of K⁺π⁻, π⁺K⁻ and π⁺π⁻ atoms

E-ISSN： 2100-014x|130|issue|01015-01015

ISSN： 2100-014x

Source： EPJ Web of Conference, Vol.130, Iss.issue, 2016-11, pp. : 01015-01015

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Abstract

Theory, using Low Energy QCD, predicts with high precision the pion-pion and pion-kaon scattering lengths. There is accurate relation between K⁺π⁻ and π⁺K⁻ atoms lifetime and pion-kaon S-wave scattering lengths with isospin 1/2 and 3/2. Experiment DIRAC at CERN PS detects 345 ± 61 pairs from K⁺π⁻ and π⁺K⁻ atoms breakup. It allows to achieve the first observation of exotic atoms consisted of pion and kaon. Measured values of πK atom lifetime and corresponding pion-kaon scattering length difference are presented. It is shown, that experimental accuracy for pion-kaon scattering length difference could be significantly improved with an experiment at SPS energy.