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

doi:10.1016/j.physletb.2009.03.001

Evidence for $\pi K$-atoms with DIRAC

High Energy Physics - Experiment 2010-12-15 v1

Authors: 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

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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.

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@article{arxiv.0905.0101,
  title  = {Evidence for $\pi K$-atoms with DIRAC},
  author = {B. Adeva and L. Afanasyev and Y. Allkofer and C. Amsler and A. Anania and A. Benelli and V. Brekhovskikh and G. Caragheorgheopol and T. Cechak and M. Chiba and P. Chliapnikov and C. Ciocarlan and S. Constantinescu and C. Curceanu and C. Detraz and D. Dreossi and D. Drijard and A. Dudarev and M. Duma and D. Dumitriu and J. L. Fungueiriño and J. Gerndt and A. Gorin and O. Gorchakov and K. Gritsay and C. Guaraldo and M. Gugiu and M. Hansroul and Z. Hons and S. Horikawa and M. Iliescu and V. Karpukhin and J. Kluson and M. Kobayashi and V. Komarov and V. Kruglov and L. Kruglova and A. Kulikov and A. Kuptsov and I. Kurochkin and A. Lamberto and A. Lanaro and V. Lapshin and R. Lednicky and P. Levi Sandri and A. Lopez Aguera and V. Lucherini and I. Manuilov and C. Mariñas and L. Nemenov and M. Nikitin and K. Okada and V. Olchevskii and M. Pentia and A. Penzo and M. Pló and G. F. Rappazzo and C. Regenfus and J. Rochet and A. Romero and V. Ronjin and A. Ryazantsev and V. Rykalin and J. Saborido and J. Schacher and A. Sidorov and J. Smolik and S. Sugimoto and F. Takeutchi and A. Tarasov and L. Tauscher and T. Trojek and S. Trusov and V. Utkin and O. Vázquez Doce and T. Vrba and V. Yazkov and Y. Yoshimura and M. Zhabitsky and P. Zrelov},
  journal= {arXiv preprint arXiv:0905.0101},
  year   = {2010}
}

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15 pages, 9 figures

Evidence for $\pi K$-atoms with DIRAC

Abstract

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