Observation of Jψ(3100) production by 209-GeV muons

A. R. Clark, K. J. Johnson, L. T. Kerth, S. C. Loken, T. W. Markiewicz, P. D. Meyers, W. H. Smith, M. Strovink, W. A. Wenzel, R. P. Johnson, C. Moore, M. Mugge, R. E. Shafer, G. D. Gollin, F. C. Shoemaker, P. Surko

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


Interactions of 209-GeV muons within a magnetized-steel calorimeter have produced 1000±80 μ+μ- pairs from Jψ(3100) decay. Redundant systems of proportional and drift chambers maintained uniform acceptance and 9% mass resolution. Above 30 GeV, the cross section for ψ production by virtual photons is found to rise less steeply with energy than predicted by a quantum chromodynamics calculation. Its dependence on Q2 fits the vector-dominance form (1+Q2M2)-2 with M=2.7±0.5 GeV.

Original languageEnglish (US)
Pages (from-to)187-190
Number of pages4
JournalPhysical review letters
Issue number3
StatePublished - 1979
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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