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Adeva B, Afanasyev L, Allkofer Y, et al. Observation of π^{-}K^{+} and π^{+}K^{-} Atoms. Phys Rev Lett. 2016;117(11):112001doi: 10.1103/PhysRevLett.117.112001.
Adeva, B., Afanasyev, L., Allkofer, Y., Amsler, C., Anania, A., Aogaki, S., Benelli, A., Brekhovskikh, V., Cechak, T., Chiba, M., Chliapnikov, P., Doskarova, P., Drijard, D., Dudarev, A., Dumitriu, D., Fluerasu, D., Gorin, A., Gorchakov, O., Gritsay, K., Guaraldo, C., Gugiu, M., Hansroul, M., Hons, Z., Horikawa, S., Iwashita, Y., Karpukhin, V., Kluson, J., Kobayashi, M., Kruglov, V., Kruglova, L., Kulikov, A., Kulish, E., Kuptsov, A., Lamberto, A., Lanaro, A., Lednicky, R., Mariñas, C., Martincik, J., Nemenov, L., Nikitin, M., Okada, K., Olchevskii, V., Pentia, M., Penzo, A., Plo, M., Prusa, P., Rappazzo, G., Romero Vidal, A., Ryazantsev, A., Rykalin, V., Saborido, J., Schacher, J., Sidorov, A., Smolik, J., Takeutchi, F., Tauscher, L., Trojek, T., Trusov, S., Urban, T., Vrba, T., Yazkov, V., Yoshimura, Y., Zhabitsky, M., Zrelov, P. (2016). Observation of π^{-}K^{+} and π^{+}K^{-} Atoms. Physical review letters, 117(11), 112001. https://doi.org/10.1103/PhysRevLett.117.112001
Adeva, B, et al. "Observation of π^{-}K^{+} and π^{+}K^{-} Atoms." Physical review letters vol. 117,11 (2016): 112001. doi: https://doi.org/10.1103/PhysRevLett.117.112001
Adeva B, Afanasyev L, Allkofer Y, Amsler C, Anania A, Aogaki S, Benelli A, Brekhovskikh V, Cechak T, Chiba M, Chliapnikov P, Doskarova P, Drijard D, Dudarev A, Dumitriu D, Fluerasu D, Gorin A, Gorchakov O, Gritsay K, Guaraldo C, Gugiu M, Hansroul M, Hons Z, Horikawa S, Iwashita Y, Karpukhin V, Kluson J, Kobayashi M, Kruglov V, Kruglova L, Kulikov A, Kulish E, Kuptsov A, Lamberto A, Lanaro A, Lednicky R, Mariñas C, Martincik J, Nemenov L, Nikitin M, Okada K, Olchevskii V, Pentia M, Penzo A, Plo M, Prusa P, Rappazzo G, Romero Vidal A, Ryazantsev A, Rykalin V, Saborido J, Schacher J, Sidorov A, Smolik J, Takeutchi F, Tauscher L, Trojek T, Trusov S, Urban T, Vrba T, Yazkov V, Yoshimura Y, Zhabitsky M, Zrelov P. Observation of π^{-}K^{+} and π^{+}K^{-} Atoms. Phys Rev Lett. 2016 Sep 09;117(11):112001. doi: 10.1103/PhysRevLett.117.112001. Epub 2016 Sep 08. PMID: 27661682.
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Phys Rev Lett. 2016 Sep 09;117(11):112001. doi: 10.1103/PhysRevLett.117.112001. Epub 2016 Sep 08.

Observation of π^{-}K^{+} and π^{+}K^{-} Atoms.

Physical review letters

B Adeva, L Afanasyev, Y Allkofer, C Amsler, A Anania, S Aogaki, A Benelli, V Brekhovskikh, T Cechak, M Chiba, P Chliapnikov, P Doskarova, D Drijard, A Dudarev, D Dumitriu, D Fluerasu, A Gorin, O Gorchakov, K Gritsay, C Guaraldo, M Gugiu, M Hansroul, Z Hons, S Horikawa, Y Iwashita, V Karpukhin, J Kluson, M Kobayashi, V Kruglov, L Kruglova, A Kulikov, E Kulish, A Kuptsov, A Lamberto, A Lanaro, R Lednicky, C Mariñas, J Martincik, L Nemenov, M Nikitin, K Okada, V Olchevskii, M Pentia, A Penzo, M Plo, P Prusa, G Rappazzo, A Romero Vidal, A Ryazantsev, V Rykalin, J Saborido, J Schacher, A Sidorov, J Smolik, F Takeutchi, L Tauscher, T Trojek, S Trusov, T Urban, T Vrba, V Yazkov, Y Yoshimura, M Zhabitsky, P Zrelov,

Affiliations

  1. Santiago de Compostela University, Santiago de Compostela, Spain.
  2. JINR, Dubna, Russia.
  3. Zurich University, Zurich, Switzerland.
  4. Albert Einstein Center for Fundamental Physics, Laboratory of High Energy Physics, Bern, Switzerland.
  5. INFN, Sezione di Trieste and Messina University, Messina, Italy.
  6. IFIN-HH, National Institute for Physics and Nuclear Engineering, Bucharest, Romania.
  7. Czech Technical University in Prague, Prague, Czech Republic.
  8. IHEP, Protvino, Russia.
  9. Tokyo Metropolitan University, Tokyo, Japan.
  10. CERN, Geneva, Switzerland.
  11. INFN, Laboratori Nazionali di Frascati, Frascati, Italy.
  12. Nuclear Physics Institute ASCR, Rez, Czech Republic.
  13. Kyoto University, Kyoto, Japan.
  14. KEK, Tsukuba, Japan.
  15. University of Wisconsin, Madison, USA.
  16. Institute of Physics ASCR, Prague, Czech Republic.
  17. Kyoto Sangyo University, Kyoto, Japan.
  18. INFN, Sezione di Trieste, Trieste, Italy.
  19. Basel University, Basel, Switzerland.
  20. Skobeltsin Institute for Nuclear Physics of Moscow State University, Moscow, Russia.

PMID: 27661682 DOI: 10.1103/PhysRevLett.117.112001

Abstract

The observation of hydrogenlike πK atoms, consisting of π^{-}K^{+} or π^{+}K^{-} mesons, is presented. The atoms are produced by 24  GeV/c protons from the CERN PS accelerator, interacting with platinum or nickel foil targets. The breakup (ionization) of πK atoms in the same targets yields characteristic πK pairs, called "atomic pairs," with small relative momenta Q in the pair center-of-mass system. The upgraded DIRAC experiment observed 349±62 such atomic πK pairs, corresponding to a signal of 5.6 standard deviations. This is the first statistically significant observation of the strange dimesonic πK atom.

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