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Evidence for [pi]K-atoms with DIRAC


Adeva, B; et al; Allkofer, Y; Amsler, C (2009). Evidence for [pi]K-atoms with DIRAC. Physics Letters B, 674(1):11 - 16.

Abstract

We present evidence for the first observation of electromagnetically bound π±Kminus-or-plus sign-pairs (πK-atoms) with the DIRAC experiment at the CERN-PS. The πK-atoms are produced by the 24 GeV/c proton beam in a thin Pt-target and the π± and Kminus-or-plus sign-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 πK-atoms. The mean life of πK-atoms is related to the s-wave πK-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 0.8 fs at 90% confidence level.

Abstract

We present evidence for the first observation of electromagnetically bound π±Kminus-or-plus sign-pairs (πK-atoms) with the DIRAC experiment at the CERN-PS. The πK-atoms are produced by the 24 GeV/c proton beam in a thin Pt-target and the π± and Kminus-or-plus sign-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 πK-atoms. The mean life of πK-atoms is related to the s-wave πK-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 0.8 fs at 90% confidence level.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:6 April 2009
Deposited On:24 Dec 2009 11:26
Last Modified:05 Apr 2016 13:41
Publisher:Elsevier
ISSN:0370-2693
Free access at:Related URL. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.physletb.2009.03.001
Related URLs:http://arxiv.org/abs/0905.0101v1

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