Publications (2)0 Total impact
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B Adeva,
L. Afanasyev,
Y. Allkofer,
C Amsler, A. Anania,
A Benelli,
V. Brekhovskikh,
G. Caragheorgheopol,
T. Cechak,
M Chiba, [......],
L. Tauscher,
T. Trojek,
S. Trusov,
V. Utkin,
O. Vázquez Doce,
T. Vrba,
V. Yazkov,
Y Yoshimura,
M. Zhabitsky,
P. Zrelov
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ABSTRACT: We present evidence for the first observation of electromagnetically bound $\pi^\pm K^\mp$-pairs ($\pi K$-atoms) with the DIRAC experiment at the CERN-PS. The $\pi K$-atoms are produced by the 24 GeV/c proton beam in a thin Pt-target and the $\pi^\pm$ and $K^\mp$-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 $\pm$ 54 $\pi K$-atoms. The mean life of $\pi K$-atoms is related to the s-wave $\pi K$-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. Comment: 15 pages, 9 figures
05/2009;
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B. Adeva,
L. Afanasyev,
Y. Allkofer,
C. Amsler, A. Anania,
A. Benelli,
V. Brekhovskikh,
G. Caragheorgheopol,
T. Cechak,
M. Chiba, [......],
L. Tauscher,
T. Trojek,
S. Trusov,
V. Utkin,
O. Vázquez Doce,
T. Vrba,
V. Yazkov,
Y. Yoshimura,
M. Zhabitsky,
P. Zrelov
[show abstract]
[hide abstract]
ABSTRACT: We present evidence for the first observation of electromagnetically bound π±K∓-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 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±54πK-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.
Physics Letters B.
