Advertisement

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)

Abstract

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 \(q\overline{q}\)\(c\overline{c}\).

Keywords

Angular Distribution Transverse Momentum Structure Function Pair Production Continuum Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  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

Personalised recommendations