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B. Adeva, .. ., M. Pentia, et al. Evidence for pi K atoms with DIRAC. Phys. Lett. B, 674, pp. 11-16, 2009.

Abstract: We present evidence for the first observation of electromagnetically bound pi^+/- K^-/+ pairs (piK-atoms) with the DIRAC experiment at the CERN-PS. The piK-atoms are produced by the 24 GeV/c proton beam in a thin Pt-target and the pi^+/- and K^-/+ mesons from the atom dissociation are analyzed in a two-arm magnetic spectrometer. The observed enhancement at low relative momentum corresponds to the production of 173+/-54 piK-atoms. The mean life of piK-atoms is related to the s-wave piK-scattering lengths, the measurement of which is the goal of the experiment. From these first data we derive a lower limit for the mean life of 0.8fs at 90% confidence level.

Keywords: DIRAC experiment, Exotic atoms, Scattering length


Posted by Mircea Pentia


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