J/ψ polarization in 800-GeV p-Cu interactions

T. H. Chang, M. E. Beddo, C. N. Brown, T. A. Carey, W. E. Cooper, C. A. Gagliardi, G. T. Garvey, D. F. Geesaman, E. A. Hawker, X. C. He, L. D. Isenhower, D. M. Kaplan, S. B. Kaufman, D. D. Koetke, P. L. McGaughey, W. M. Lee, M. J. Leitch, J. M. Moss, B. A. Mueller, V. PapavassiliouJ. C. Peng, P. E. Reimer, M. E. Sadler, W. E. Sondheim, P. W. Stankus, R. S. Towell, R. E. Tribble, M. A. Vasiliev, J. C. Webb, J. L. Willis, G. R. Young

Research output: Contribution to journalArticlepeer-review


The polarization of the J/ψ was measured with relatively high statistical precision only in fixed-target experiments, in pion and proton interactions with solid nuclear targets. No significant polarization was seen in either, with the exception of an intriguing large longitudinal polarization at the highest xF value of the pion-induced data. Thus, measurements in collider experiments, at energies and transverse momenta where theoretical calculations should be more robust and which were free of potential complications from nuclear effects, suffer from low statistics.

Original languageEnglish (US)
Article number211801
Pages (from-to)211801/1-211801/4
JournalPhysical review letters
Issue number21
StatePublished - Nov 21 2003
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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