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

  • P. Amaudruz
  • , M. Arneodo
  • , A. Arvidson
  • , B. Badelek
  • , G. Baum
  • , J. Beaufays
  • , I. G. Bird
  • , M. Botje
  • , C. Broggini
  • , W. Brückner
  • , A. Brüll
  • , W. J. Burger
  • , J. Ciborowski
  • , R. van Dantzig
  • , H. Döbbeling
  • , J. Domingo
  • , J. Drinkard
  • , M. Düren
  • , H. Engelien
  • , M. I. Ferrero
  • L. Fluri, D. von Harrach, M. van der Heijden, C. Heusch, Q. Ingram, K. Janson, M. de Jong, E. M. Kabuss, R. Kaiser, T. J. Ketel, F. Klein, S. Kullander, U. Landgraf, T. Lindqvist, G. K. Mallot, C. Mariotti, G. van Middelkoop, Y. Mizuno, J. Nassalski, D. Nowotny, C. Peroni, B. Povh, R. Rieger, K. Rith, K. Röhrich, E. Rondio, L. Ropelewski, A. Sandacz, C. Scholz, U. Sennhauser, F. Sever, T. A. Shibata, M. Siebler, A. Simon, A. Staiano, Y. Tzamouranis, J. L. Vuilleumier, T. Walcher, R. Windmolders, F. Zetsche

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)553-566
Number of pages14
JournalNuclear Physics B
Volume371
Issue number3
DOIs
Publication statusPublished - 9 Mar 1992
Externally publishedYes

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