Proceedings of European Physical Society Europhysics Conference on High Energy Physics — PoS(EPS-HEP 2009) 2010
DOI: 10.22323/1.084.0078
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Experimental evidence for piK-atoms

Abstract: Electromagnetically bound π ± K ∓ -pairs (πK-atoms) have been observed by the DIRAC-II experiment at the CERN-PS. The πK-atoms were produced by the 24 GeV/c proton beam impinging on a thin Pt-target. The π ± -and K ∓ -mesons from the atom dissociation were analyzed in a two-arm magnetic spectrometer. An enhancement was observed at low relative momentum, corresponding to the production of 173 ± 54 πK-atoms. From these first data a lower limit for the mean life of 0.8 fs was derived at the 90% confidence level. … Show more

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