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29 March 2024
 
  » arxiv » 0905.0101

 Article overview


Evidence for $pi K$-atoms with DIRAC
B. Adeva ; L. Afanasyev ; Y. Allkofer ; C. Amsler ; A. Anania ; A. Benelli ; V. Brekhovskikh ; G. Caragheorgheopol ; T. Cechak ; M. Chiba ; P. Chliapnikov ; C. Ciocarlan ; S. Constantinescu ; C. Curceanu ; C. Detraz ; D. Dreossi ; D. Drijard ; A. Dudarev ; M. Duma ; D. Dumitriu ; J.L. Fungueiriño ; J. Gerndt ; A. Gorin ; O. Gorchakov ; K. Gritsay ; C. Guaraldo ; M. Gugiu ; M. Hansroul ; Z. Hons ; S. Horikawa ; M. Iliescu ; V. Karpukhin ; J. Kluson ; M. Kobayashi ; V. Komarov ; V. Kruglov ; L. Kruglova ; A. Kulikov ; A. Kuptsov ; I. Kurochkin ; A. Lamberto ; A. Lanaro ; V. Lapshin ; R. Lednicky ; P. Levi Sandri ; A. Lopez Aguera ; V. Lucherini ; I. Manuilov ; C. Mariñas ; L. Nemenov ; M. Nikitin ; K. Okada ; V. Olchevskii ; M. Pentia ; A. Penzo ; M. Pló ; G.F. Rappazzo ; C. Regenfus ; J. Rochet ; A. Romero ; V. Ronjin ; A. Ryazantsev ; V. Rykalin ; J. Saborido ; J. Schacher ; A. Sidorov ; J. Smolik ; S. Sugimoto ; F. Takeutchi ; A. Tarasov ; L. Tauscher ; T. Trojek ; S. Trusov ; V. Utkin ; O. Vázquez Doce ; T. Vrba ; V. Yazkov ; Y. Yoshimura ; M. Zhabitsky ; P. Zrelov ;
Date 1 May 2009
AbstractWe 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.
Source arXiv, 0905.0101
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