Published March 9, 1992 | Version v1
Journal article

Ratio of J/ψ production cross sections in deep inelastic muon scattering from tin and carbon

Creators

  • 1. Univ. de l'Etat, Mons (Belgium)
  • 2. Univ. Heidelberg (Germany)
  • 3. Inst. for Nuclear Studies, Warsaw (Poland)
  • 4. CERN, Geneva (Switzerland)
  • 5. Univ. Mainz (Germany)
  • 6. Univ. California, Santa Cruz, CA (United States)
  • 7. Univ. Freiburg (Germany)
  • 8. Univ. Neuchatel (Switzerland)
  • 9. Max-Planck-Institut, Heidelberg (Germany)
  • 10. NIKHEF-K, Amsterdam (Netherlands)
  • 11. Univ. Bielefeld (Germany)
  • 12. Univ. Warsaw (Poland)
  • 13. Univ. Uppsala (Sweden)
  • 14. INFN, Turin (Italy)
  • 15. Univ. Turin (Italy)
  • 16. Paul Scherrer Inst., Villigen (Switzerland)

Description

We present results on J/ψ production in muon interactions with tin and carbon targets at incident muon energies of 200 and 280 GeV. The ratio of cross sections per nucleon for J/ψ production on tin and carbon, R(Sn/C), is studied as a function of pT2, z and x. We find an enhancement for coherent J/ψ production Rcoh(Sn/C)=1.54±0.07, a suppression for quasielastic production Rqe(Sn/C)=0.79±0.06 and for inelastic production Rin(Sn/C)=1.13±0.08. The inelastic cross section ratio can be interpreted within the Colour Singlet model as an enhancement of the gluon distribution in tin with respect to that in carbon. The dependence of the ratio on z and pT2 can explain the discrepancy between the results obtained in previous experiments. (orig.)

Additional details

Publishing Information

Journal Title
Nuclear Physics. B, Particle Physics
Journal Volume
371
Journal Issue
3
Series
Nucl. Phys., B Part. Phys.
Journal Page Range
553-566
ISSN
0550-3213
CODEN
NUPBB