Il Nuovo Cimento A (1965-1970)

, Volume 44, Issue 3, pp 345–366 | Cite as

Inclusive production of lambda in the proton fragmentation region from Kp→ΛX at 4.2 GeV/c

  • S. N. Ganguli
  • R. J. Hemingway
  • S. O. Holmgreen
  • M. J. Losty
  • H. Muirhead
  • W. Kittel
  • C. L. A. Pols
  • W. D. Shephard
  • J. S. Vergeest
  • P. R. Lamb
  • J. Wells
  • Amsterdam-CERN-Nijmegen-Oxford Collaboration
Article

Summary

A study of Λ production has been made for the process\(p\underrightarrow {K^ - }\Lambda \) from Kp interactions at 4.2 GeV/c. The total Λ production cross-section is (4.5±0.2) mb and the cross-section in which Λ is associated with\(K\bar K\) in the final state is found to be (0.44±0.03) mb. A study of the polarization is made for the off-mass-shell strangeness annihilations\( \ll K\bar K \gg \to pions\) and strangeness nonannihilations\( \ll K\bar K \gg \to K\bar K + pions\); the polarization, when plotted as a function ofx,pT and (recoiling mass)2, exhibits differences between the two processes. The polarization observed in the strangeness nonannihilation process shows identical behaviour to that in\(p\bar p\) reactions. An attempt has been made to understand the behaviour of the polarized and the unpolarized cross-sections as a function of (recoiling mass)2 in the triple-Regge framework.

Riassunto

Si è effettuato uno studio della produzione di particelle Λ per il processo\(p\underrightarrow {K^ - }\Lambda \) dalle interazioni Kp a 4.2 GeV/c. La sezione d'urto totale della produzione di Λ è (4.5±0.2) mb e si trova che la sezione d'urto in cui Λ è associata con\(K\bar K\) nello stato finale è (0.44±0.03) mb. Si fa uno studio della polarizzazione per le annichilazioni della stranezza al di fuori dello strato delle masse\( \ll K\bar K \gg \to pions\) e per le non annichilazioni della stranezza\( \ll K\bar K \gg \to K\bar K + pions\); la polarizzazione quando calcolata in funzione dix, pT e (massa di rinculo)2 mostra differenze tra i due processi. La polarizzazione osservata nel processo di non annichilazione della stranezza mostra un comportamento identico a quello nelle reazioni\(p\bar p\). Si è fatto un tentativo di comprendere il comportamento delle sezioni d'urto polarizzate e non in funzione della (massa di rinculo)2 nel sistema triplice secondo Regge.

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Copyright information

© Società Italiana di Fisica 1978

Authors and Affiliations

  • S. N. Ganguli
    • 1
  • R. J. Hemingway
    • 1
  • S. O. Holmgreen
    • 1
  • M. J. Losty
    • 1
  • H. Muirhead
    • 1
  • W. Kittel
    • 2
  • C. L. A. Pols
    • 2
  • W. D. Shephard
    • 2
  • J. S. Vergeest
    • 2
  • P. R. Lamb
    • 3
  • J. Wells
    • 3
  • Amsterdam-CERN-Nijmegen-Oxford Collaboration
  1. 1.CERNEuropean Organization for Nuclear ResearchGenevaSwitzerland
  2. 2.Fysisch LaboratoriumUniversiteit van NijmegenNijmegenNetherlands
  3. 3.Nuclear Physics LaboratoryUniversity of OxfordOxfordU.K.
  4. 4.Tata Institute of Fundamental ResearchBombayIndia
  5. 5.Department of PhysicsUniversity of LiverpoolLiverpoolU.K.
  6. 6.Department of PhysicsUniversity of Notre DameNotre DameU.S.A.

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