The Quark Recombination Mechanism in Multi-Hadron Production

  • L. Van Hove
Conference paper
Part of the Acta Physica Austriaca book series (FEWBODY, volume 21/1979)


The lectures discuss the role of quarks and gluons in high energy hadron collisions, in particular in the dominant class of such collisions which are those of non-diffractive low-pT type. The main progress made recently in this field concerns the secondaries produced in the fragmentation regions of the incident hadrons. The observed similarity in the x-distributions of incident valence quarks and secondary mesons at medium and large x is well accounted for by the quark recombination model. Studying the case of pp collisions, we explicitly exhibit how this similarity comes about and find on the basis of recent ISR data that, contrary to earlier claims, only a modest enhancement of the parton sea is needed to explain the absolute magnitude of the observed cross section. We also find that inclusive meson production at large x is best accounted for by additive contributions of recombination and triple-Regge mechanism. Starting from the meson production data, we then show that by using the hyperon production rate as additional input, one can estimate the probabilities for the various ways in which the three valence quarks of an incident proton recombine with each other and/or whith sea partons to produce secondaries in the fragmentation region.


Valence Quark Fragmentation Region Incident Proton Recombination Model Diffraction Dissociation 
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  1. [1]
    S. Pokorski and L. Van Hove, Acta Phys. Pol. B5 (1974) 229.Google Scholar
  2. [2]
    L. Van Hove and S. Pokorski, Nucl. Phys. B86 (1975) 243; L. Van Hove, Acta Phys. Pol. B7 (1976) 339.Google Scholar
  3. [3]
    W. Ochs, Nucl. Phys. B118 (1977) 397; see also H. Goldberg, Nucl. Phys. B44 (1972) 149.Google Scholar
  4. [4]
    K.P. Das and R.C.Hwa, Phys. Lett. 68B (1977) 459; see also D.W. Duke and F.E. Taylor, Phys.Rev.D17 (1978) 1788; and C.B. Chiu et al., Fast Meson Production and the Recombination Model, University of Texas at Austin, Preprint ORO 356 (October 1978).Google Scholar
  5. [5]
    J.Singh et al. (CHLM Collaboration), Nucl. Phys. B140 (1978) 189.CrossRefADSGoogle Scholar
  6. [6]
    G. Miller et al., Phys.Rev. D5 (1972) 528;A.Bodek et al., Phys.Rev. Lett. 30 (1973) 1087 and Phys.Lett. 51B (1974) 419.Google Scholar
  7. [7]
    S.Brodsky and G.Farrar, Phys.Rev.Lett. 31 (1973) 1153; V.A.Matveev et al., Nuovo Cimento Lett. 1 (1973) 719.Google Scholar
  8. [8]
    M.G.Albrow et al., Nucl.Phys. B73 (1974) 40.CrossRefADSGoogle Scholar
  9. [9]
    M.J.Teper, Applying the Parton Model to the Fast Hadrons at Low pT, Rutherford Laboratory, Preprint RL-78–022/A, March 1978.Google Scholar
  10. [10]
    A.V.Barnes et al., Phys.Rev.Lett. 41 (1978) 1260.CrossRefADSGoogle Scholar
  11. [11]
    V. Blobel et al., Nucl. Phys. B69 (1974) 454.CrossRefADSGoogle Scholar
  12. [12]
    K.Alpgard et al., Nucl. Phys. B103 (1976) 234.CrossRefADSGoogle Scholar
  13. [13]
    R.G. Roberts, R.C.Hwa and S.Matsuda, Parton Recombination Model Including Resonance Production, Rutherford Laboratory, Preprint RL-78–040 (May 1978).Google Scholar
  14. [14]
    W. Lockman et al., Phys.Rev. Lett. 41 (1978) 680.CrossRefADSGoogle Scholar
  15. [15]
    R.C.Hwa and R.G.Roberts, Z. Physik Cl (1979) 81Google Scholar
  16. [16]
    T.A. DeGrand and H.I.Miettinen, Phys.Rev.Lett. 40 (1978) 612; J.Ranft, Phys.Rev. D18 (1978) 1491; T.A.DeGrand, Hadronic Fragmentation Initiated by Pointlike Probes, SLAC, Preprint SLAC-PUB-2182 (August 1978), submitted to Phys.Rev.D.Google Scholar
  17. [17]
    A.Capella et al., Jets in Small-pT Hadronic Collisions, Universality of Quark Fragmentation, and Rising Rapidity Plateaus, Orsay, Preprint LPTE 78 /30 (October 1978).Google Scholar
  18. [18]
    B.Andersson, G.Gustafson and C.P.Peterson, Phys. Lett. 69B (1977) 221.Google Scholar
  19. [19]
    G.Cohen-Tannoudji et al., A Quark-Parton Model from Dual Unitarization, CEN-Saclay, Preprint DPh-T/78/88 (October 1978), submitted to Phys. Rev. D.Google Scholar
  20. [20]
    J. Kalinowski, S. Pokorski and L. Van Hove, Z. Physik, to appear.Google Scholar

Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • L. Van Hove
    • 1
  1. 1.CERNGenève 23Switzerland

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