QCD in the Limit xF → 1 as Studied in the Reaction π-Nµ+µ-X

  • Kirk T. McDonald
Part of the NATO ASI Series book series (NSSB, volume 197)


In Fermilab experiment E 615 wel have measured the production of high-mass muon pairs with 80- and 252-GeV pion beams. The relatively large momentum of quarks in pions allows us the study the QCD subprocess \(q\overline{q}\)µ + µ in the kinematic limit \(x_{\pi }^{\overline{q}}\) → 1. The data are consistent with many of the features of a higher-twist analysis, particulary the departure of the muon-pair angular distribution from the standard form 1+cos2 θ t . Analysis of J/ψ) and ψ’ production in the same data sample gives further evidence for interesting effects as xF → 1, which we attribute to the process \(q\overline{q}\)\(c\overline{c}\).


Angular Distribution Transverse Momentum Structure Function Pair Production Continuum Analysis 


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  1. 1.
    The members of the E 615 collaboration are: University of Chicago: C.E. Adolph-sen, J.P. Alexander, K.J. Anderson, J.S. Conway, J.G. Heinrich, K.W. Merritt, J.E. Pilcher, and A. Possoz; Iowa State University: E.I. Rosenberg and D.T. Simpson; Princeton University: C. Biino, J.F. Greenhalgh, P. Kaaret, W.C. Louis, K.T. McDonald, S. Palestini, D.P. Russell, F.C. Shoemaker, and A.J.S. Smith.Google Scholar
  2. C.B. Newman et al.,Determination of the Pion Structure Function from Muon-Pair Production, Phys. Rev. Lett. 42:951 (1979).ADSCrossRefGoogle Scholar
  3. 3.
    S.D. Drell and T.-M. Yan, Massive Lepton-Pair Production in Hadron-Hadron Collisions at High Energies, Phys. Rev. Lett. 25: 316 (1970).ADSCrossRefGoogle Scholar
  4. 4.
    E.L. Berger and S.J. Brodsky, Quark Structure Functions of Mesons and the Drell-Yan Process, Phys. Rev. Lett. 42: 940 (1979);ADSCrossRefGoogle Scholar
  5. E.L. Berger, Higher-Twist Effects in QCD, Deep Inelastic Scattering, and the Drell-Yan Process, Z. Phys. C4: 289 (1980).Google Scholar
  6. K.J. Anderson et al.,Evidence for Longitudinal Photon Polarization in Muon-Pair Production by Pions, Phys. Rev. Lett. 43:1219 (1979).ADSCrossRefGoogle Scholar
  7. C. Biino et al.,An Apparatus to Measure the Structure of the Pion, Nucl. Instr. Meth. A243:323 (1986).ADSGoogle Scholar
  8. S. Palestini et al.,Pion Structure as Observed in the Reaction π−N → µ+µ−X at 80 GeV/c, Phys. Rev. Lett. 55:2649 (1985).ADSCrossRefGoogle Scholar
  9. 8.
    G. Altarelli, R.K. Ellis, and G. Martinelli, Large Perturbative Corrections to the Drell-Yan Process in QCD, Nucl. Phys. B157: 461 (1979);Google Scholar
  10. J. Kubar et al.,QCD Corrections to the Drell-Yan Mechanism and the Pion Structure Function, Nucl, Phys. B175:251 (1980).ADSCrossRefGoogle Scholar
  11. 9.
    For details of the continuum analysis see: J.S. Conway, Ph.D. Dissertation, U. of Chicago (1987).Google Scholar
  12. J. Badier et al.,Experimental Determination of the Tr Meson Structure Functions by the Drell-Yan Mechanism, Z. Phys. C18:281 (1983).ADSGoogle Scholar
  13. H. Abramovicz et al.,Neutrino and Antineutrine Charged-Current Inclusive Scattering in Iron in the Energy Range 20 < E 300 < GeV, Z. Phys. C17:283 (1983).ADSGoogle Scholar
  14. D.B. McFarlane et al.,Nucleon Structure Functions from High Energy Neutrino Interactions with Iron and QCD Results, Z. Phys. C26:1 (1984).ADSGoogle Scholar
  15. B. Betev et al.,Observation of Anomalous Scaling Violation in Muon Pair Production by 194 GeV/c p-Tungsten Interactions, Z. Phys. C28:15 (1985).ADSGoogle Scholar
  16. 14.
    A.J. Buras and K.J.F. Gaemers, Simple Parametrization of Parton Distributions with Q2 Dependence Given by Asymptotic Freedom, Nucl. Phys. B132: 249 (1978).ADSCrossRefGoogle Scholar
  17. 15.
    R.J. Oakes, Muon Pair Production in Strong Interactions, Nuovo Cimento 44A: 440 (1966).ADSGoogle Scholar
  18. 16.
    C.S. Lam and W.-K. Tung, Parton-Model Relation without QuantumChromdynamic Modifications in Lepton Pair Production, Phys. Rev. D21: 2712 (1980).ADSCrossRefGoogle Scholar
  19. S. Falciano et al.,Angular Distribution of Muon Pairs Produced by 194 GeV/c Negative Pions, Z. Phys. C31:513 (1986).ADSGoogle Scholar
  20. C. Biino et al., J/11i Longitudinal Polarization from irN Interactions, Phys. Rev. Lett. 58:2523 (1987).ADSCrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • Kirk T. McDonald
    • 1
  1. 1.Joseph Henry LaboratoriesPrinceton UniversityPrincetonUSA

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