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Direct determination of two-pion correlations for pp→ 2π+2π− annihilation at rest

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Abstract

We study ππ correlations in the exclusive reaction pp → 2π+2π− at rest measured by the CPLEAR experiment. Avoiding the introduction of an arbitrary reference sample, we analyse differential distributions for equal charge pion pairs removing the phase-space factor event by event. A peak at small relative momenta is most pronounced for large total momentum of the pair. The physical implications of bosonic symmetrization for the properties of the pion source, in particular its radius, are briefly discussed. The two extremes considered are the chaotic Hanbury-Brown-Twiss mechanism and the coherent Skyrmion model.

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Authors and Affiliations

  1. University of Athens, Greece

    A. Angelopoulos, A. Apostolakis & L. Sakeliou

  2. University of Basle, Switzerland

    G. Backenstoss, F. Leimgruber, P. Pavlopoulos, G. Polivka, R. Rickenbach, T. Schietinger, L. Tauscher & S. Vlachos

  3. Boston University, USA

    M. B. Chertok, D. Francis, J. Miller, B. L. Roberts & D. Zimmerman

  4. CERN, Geneva, Switzerland

    P. Bloch, M. Fidecaro, P. Kokkas, T. Ruf & A. Schopper

  5. LIP and University of Coimbra, Portugal

    J. Carvalho, R. Ferreira-Marques, E. Machado, J. Pinto da Cunha, A. Policarpo & E. Van Beveren

  6. Delft University of Technology, Netherlands

    R. W. Hollander, R. Kreuger & C. W. E. Van Eijk

  7. University of Fribourg, Switzerland

    F. Blanc, L. Faravel & L. A. Schaller

  8. University of Ioannina, Greece

    I. Evangelou, N. Manthos & F. Triantis

  9. University of Liverpool, UK

    A. Benelli, M. Carroll, E. Cawley, A. Cody, J. Fry, E. Gabathuler, R. Gamet, A. Haselden, P. J. Hayman, P. Sanders & C. Touramanis

  10. J. Stefan Inst. and Phys. Dep., University of Ljubljana, Slovenia

    A. Filipčič, I Mandić, M. Mikuž & D. Zavrtanik

  11. CPPM, IN2P3-CNRS et University d'Aix-Marseille II, Marseille, France

    E. Aslanides, V. Bertin, A. Ealet, F. Henry-Couannier, E. Hubert, R. Le Gac, F. Montanet & F. Touchard

  12. CSNSM, IN2P3-CNRS, Orsay, France

    C. Thibault

  13. Paul Scherrer Institut (PSI), Villigen, Switzerland

    P. Bargassa, F. Blanc, P. -R. Kettle, R. Kreuger, T. Nakada & O. Wigger

  14. CEA, DSM/DAPNIA CE-Saclay, France

    G. Chardin, M. Dejardin, J. Derre, D. Garreta, A. Go, G. Marel, A. Muller, A. Soares & C. Yeche

  15. KTH-Stockholm, Sweden

    P. Carlson, M. Danielsson & K. Jon-And

  16. University of Thessaloniki, Greece

    S. Charalambous, C. Eleftheriadis, A. Liolios & I. Papadopoulos

  17. ETH-IPP, Zürich, Switzerland

    O. Behnke, W. Fetscher, H. -J. Gerber, B. Pagels, M. Schäfer, P. Weber & M. Wolter

  18. Theory Gruop Fl, Paul Scherrer Institute (PSI), Villigen, Switzerland

    M. P. Locher & V. E. Markushin

Authors
  1. A. Angelopoulos
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  2. A. Apostolakis
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  3. E. Aslanides
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  4. G. Backenstoss
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  5. P. Bargassa
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  6. O. Behnke
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  7. A. Benelli
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  8. V. Bertin
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  9. F. Blanc
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  10. P. Bloch
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  11. P. Carlson
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  12. M. Carroll
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  13. J. Carvalho
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  14. E. Cawley
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  15. S. Charalambous
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  16. G. Chardin
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  17. M. B. Chertok
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  18. A. Cody
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  19. M. Danielsson
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  20. M. Dejardin
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  21. J. Derre
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  22. A. Ealet
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  23. C. Eleftheriadis
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  24. I. Evangelou
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  25. L. Faravel
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  26. R. Ferreira-Marques
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  27. W. Fetscher
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  28. M. Fidecaro
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  29. A. Filipčič
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  30. D. Francis
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  31. J. Fry
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  32. E. Gabathuler
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  33. R. Gamet
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  34. D. Garreta
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  35. H. -J. Gerber
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  36. A. Go
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  37. A. Haselden
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  38. P. J. Hayman
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  39. F. Henry-Couannier
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  40. R. W. Hollander
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  41. E. Hubert
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  42. K. Jon-And
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  43. P. -R. Kettle
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  44. P. Kokkas
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  45. R. Kreuger
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  47. F. Leimgruber
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  48. A. Liolios
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  49. M. P. Locher
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  50. E. Machado
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  51. I Mandić
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  52. N. Manthos
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  53. G. Marel
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  54. V. E. Markushin
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  55. M. Mikuž
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  56. J. Miller
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  57. F. Montanet
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  58. A. Muller
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  59. T. Nakada
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  60. B. Pagels
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  61. I. Papadopoulos
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  62. P. Pavlopoulos
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  63. J. Pinto da Cunha
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  64. A. Policarpo
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  65. G. Polivka
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  68. T. Ruf
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  69. L. Sakeliou
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  70. P. Sanders
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  71. M. Schäfer
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  72. L. A. Schaller
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  73. T. Schietinger
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  74. A. Schopper
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  75. A. Soares
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  76. L. Tauscher
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  77. C. Thibault
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  78. F. Touchard
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  79. C. Touramanis
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  80. F. Triantis
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  81. E. Van Beveren
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  82. C. W. E. Van Eijk
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  83. S. Vlachos
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  84. P. Weber
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  85. O. Wigger
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  86. M. Wolter
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  87. C. Yeche
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  88. D. Zavrtanik
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  89. D. Zimmerman
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CPLEAR Collaboration., Angelopoulos, A., Apostolakis, A. et al. Direct determination of two-pion correlations for pp→ 2π+2π− annihilation at rest. Eur. Phys. J. C 1, 139–148 (1998). https://doi.org/10.1007/BF01245804

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  • DOI: https://doi.org/10.1007/BF01245804

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