Il Nuovo Cimento (1955-1965)

, Volume 33, Issue 5, pp 1249–1264 | Cite as

The Production of\(K^0 \bar K^0 \) Pairs by 10 GeV/c Negative Pions on ProtonsPairs by 10 GeV/c Negative Pions on Protons

  • A. Bigi
  • S. Brandt
  • A. de Marco-Trabucco
  • Ch. Peyrou
  • R. Sosnowski
  • A. Wróblewski


On 83 000 photographs from an exposure of the 81 cm Saclay hydrogen bubble chamber to a 10 GeV/e π beam of the CERN proton synchrotron, 63 events have been found showing a beam interaction in a fiducial region of the chamber and the decay of two neutral kaons from this interaction. The c.m. distributions of all produced particles are given. It was found that nucleons are emitted strongly backwards in the c.m.s. while both kaons show a pronounced forward emission. Pions are emitted with small momenta nearly isotropically. None of the known kaon or nucleon isobars is strongly produced, whereas a peaking of the (K 1 0 k 1 0 Q-value is observed at ~ 50 MeV. The average transverse and total c.m. momenta increase with the mass of the produced particles.


Fra 83000 fotografie di un’esposizione della camera a bolle ad idrogeno di 81 cm di Saclay al raggio di π- di 10 GeV/c del protosincrotrone del CERN si sono trovati 63 eventi di interazione del fascio in una regione fiduciaria della camera e il decadimento di due kaoni neutri prodotti in tale interazione. Si dànno le distribuzioni nel c.m. di tutte le particelle prodotte. Si è trovato che i nucleoni sono emessi fortemente all’indietro nel c.m. mentre i due kaoni sono emessi spiccatamente in avanti. I pioni sono emessi con deboli impulsi quasi isotropicamente. Nessuno dei kaoni o nucleoni isobari è prodotto abbondantemente, mentre si osserva un picco del valore diQ per (K 1 0 K 1 0 ) a ~ 50 MeV. I momenti medi trasversale e totale aumentano con la massa delle particelle prodotte.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. (1).
    M. I. Soloviev:Proceedings of the 1960 International Conference on High-Energy Physics at Rochester, p. 388.Google Scholar
  2. (2).
    J. Bartke, R. Budde, W. A. Cooper, H. Filthuth, Y. Goldschmidt- Clermont, G. R. Macleod, A. de Marco, A. Minguzzi-Ranzi, L. Montanet, D. R. O. Morrison, S. Nilsson, Ch. Peyrou, R. Sosnowski, A. Bigi, R. Carrara, C. Fran- zinetti, I. Mannelli, G. Brautti, M. Ceschia andL. Chersovani:Proceedings of the 1962 International Conference on High-Energy Physics at Rochester, p. 402;Nuovo Cimento,24, 876 (1962).Google Scholar
  3. (3).
    T. Ferbel andH. Taft:Nuovo Cimento,28, 1214 (1963).CrossRefGoogle Scholar
  4. (4).
    V. A. Belyakov, Wang Yung-Chang, V. I. Veksler, N. M. Viryasov, Du Yuan-cai, Kim Hi In, E. N. Kladnitskaya, A. A. Kuznetsov, A. Mikhul, Nguyen Dinh-Tu, V. N. Penev, E. S. Sokolova andM. I. Soloviev:Proceedings of the 1962 International Conference on High-Energy Physics at CERN, p. 261, 336.Google Scholar
  5. (5).
    H. H. Bingham, M. Bloch, D. Drijard, A. Minguzzi-Ranzi andM. Nicolić:Proceedings oft he 1962 International Conference on High-Energy Physics at CERN, p. 240 (see alsoNuovo Cimento,29, 339 (1963)).Google Scholar
  6. (6).
    A. Bigi, S. Brandt, R. Carrara, W. A. Cooper, A. de Marco, G. R. Macleod, Ch. Peyrou, R. Sosnowski andA. Wroblewski:Proceedings of the 1962 Interna- tional Conference on High-Energy Physics at CERN, p. 237.Google Scholar
  7. (7).
    A. Bigi, S. Brandt, A. de Marco-Trabucco, Ch. Peyeou, R. Sosnowski andA. Wroblewski:Nuovo Cimento,33, 1265 (1964).CrossRefGoogle Scholar
  8. (8).
    A. Kernan, R. Böck andW. G. Moorhead: Internal CERN/DD report (1961).Google Scholar
  9. (9).
    C. Dilworth, D. R. O. Morrison andG. Mambriani:Nuovo Cimento,32, 1432 (1964).CrossRefGoogle Scholar
  10. (10).
    S. Brandt: CERN Internal Note DD/EXP/62/25; andS. Brandt:Dissertation, Bonn University (1963).Google Scholar
  11. (*).
    The cross-section calculations were based on the value of the total cross-section Σπ-gr = (26.5±0.5) mb at 10 GeV/c as given byG. von Dardel et al.:Phys. Rev. Lett,8, 173 (1962).ADSCrossRefGoogle Scholar
  12. (11).
    L. Bertanza, B. B. Culwick, K. W. Lai, I. S. Mitra, N. P. Samios, A. M. Thorndike, S. S. Yamamoto andR. M. Lea:Phys. Rev.,130, 786 (1963).ADSCrossRefGoogle Scholar
  13. (12).
    G. Alexander, O. I. Dahl, L. Jacobs, G. R. Kalbfleisch, D. H. Miller, A. Rittenberg, J. Schwartz andG. A. Smith:Phys. Rev. Lett.,9, 460 (1962).ADSCrossRefGoogle Scholar
  14. (13).
    A. R. Erwin, G. A. Hoyer, R. A. March, W. D. Walker andT. P. Wangler:Phys. Rev. Lett.,9, 34 (1962).ADSCrossRefGoogle Scholar
  15. (14).
    L. Bertanza, V. Brisson, P. L. Connolly, E. L. Hart, I. S. Mittra, G. C. Moneti, K. E. Rau, N. P. Samios, I. O. Skillicorn, S. S. Yamamoto, M. Goldberg, L. Gray, J. Leitner, S. Lichtman andJ. Westgard:Phys. Rev. Lett.,9, 180 (1962).ADSCrossRefGoogle Scholar
  16. (15).
    P. L. Connolly, E. L. Hart, K. W. Lai, G. London, G. C. Moneti, R. R. Rau, N. P. Samios, I. O. Skillicorn, S. S. Yauamoto, M. Goldberg, M. Gundzik, J. Leitner andS. Lichtman:Phys. Rev. Lett.,10, 371 (1963).ADSCrossRefGoogle Scholar
  17. (16).
    P. Schlein, W. E. Slater, L. T. Smith, D. H. Stork andH. K. Ticho:Phys. Rev. Lett,10, 368 (1963).ADSCrossRefGoogle Scholar
  18. (17).
    Z. Koba andR. Sosnowski: to be published.Google Scholar

Copyright information

© Società Italiana di Fisica 1964

Authors and Affiliations

  • A. Bigi
    • 1
  • S. Brandt
    • 1
  • A. de Marco-Trabucco
    • 1
  • Ch. Peyrou
    • 1
  • R. Sosnowski
    • 1
  • A. Wróblewski
    • 1
  1. 1.CERNGeneva

Personalised recommendations