Measurement of the inclusive J/ψ production cross sections in pp and pp collisions at √s = 24.3 GeV

C. Morel, A. Bernasconi, R. E. Breedon, L. Camilleri, R. L. Cool, P. T. Cox, P. Cushman, L. Dick, E. C. Dukes, B. Gabioud, F. Gaille, P. Giacomelli, J. B. Jeanneret, C. Joseph, W. Kubischta, J. F. Loude, E. Malamud, O. E. Overseth, J. L. Pages, J. P. PerroudD. Rüegger, R. W. Rusack, G. R. Snow, G. Sozzi, D. Steiner, M. T. Tran, A. Vacchi, G. Valenti

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26 Scopus citations


The inclusive cross section times branching ratio for J/ψ→e+e- has been measured in the forward region in the UA6 experiment for pp and pp collisions at √s = 24.3 GeV. The ratio of the pp to pp cross sections is found to be 0.76 ± 0.14 ± 0.06. This demonstrates that gluon-gluon fusion dominates over quark-antiquark annihilation in the formation of the cc state.

Original languageEnglish (US)
Pages (from-to)505-510
Number of pages6
JournalPhysics Letters B
Issue number3
StatePublished - Dec 20 1990

Bibliographical note

Funding Information:
We are indebtedto J.P. Guillet for his help with the theoreticailn terpretatioonf our data. We wish to thank the CERN PS and SPS Divisionsf or the efficient operationo f the antiprotonso urcea ndthe SPS Collider.W e also thankt heEP and SPS Divisionsf or their extensives upportd uringboth the installation and the runnings tageso f UA6. Finally, we gratefully acknowledgteh ed edicatedsu pporto f the UA6 technical and secretariaslt aff.This work is partiallys up- portedb y the Swiss NationalS cienceF oundationt,h e US National Science Foundationa nd US Department of Energy.


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