Phys. Rev. Lett.
91,
211801
(2003)
[4 pages]
J/ψ Polarization in 800-GeV p-Cu Interactions
T. H. Chang et al. FNAL E866/NuSea Collaboration
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T. H. Chang7,*, M. E. Beddo7, C. N. Brown3, T. A. Carey6, W. E. Cooper3, C. A. Gagliardi9, G. T. Garvey6, D. F. Geesaman2, E. A. Hawker9,6,†, X. C. He4, L. D. Isenhower1, D. M. Kaplan5, S. B. Kaufman2, D. D. Koetke10, P. L. McGaughey6, W. M. Lee4,‡, M. J. Leitch6, J. M. Moss6, B. A. Mueller2, V. Papavassiliou7, J. C. Peng6,*, P. E. Reimer6,2, M. E. Sadler1, W. E. Sondheim6, P. W. Stankus8, R. S. Towell1,6, R. E. Tribble9, M. A. Vasiliev9,§, J. C. Webb7,**, J. L. Willis1, and G. R. Young8 (FNAL E866/NuSea Collaboration)
1Abilene Christian University, Abilene, Texas 79699, USA 2Argonne National Laboratory, Argonne, Illinois 60439, USA 3Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA 4Georgia State University, Atlanta, Georgia 30303, USA 5Illinois Institute of Technology, Chicago, Illinois 60616, USA 6Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 7New Mexico State University, Las Cruces, New Mexico 88003, USA 8Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 9Texas A&M University, College Station, Texas 77843, USA 10Valparaiso University, Valparaiso, Indiana 46383, USA
Received 30 July 2003; published 21 November 2003
We present measurements of the polarization of the J/ψ produced in 800-GeV proton interactions with a copper target. Polarization of the J/ψ is sensitive to the cc̅ production and hadronization processes. A longitudinal polarization is observed at large xF, while at small xF the state is produced essentially unpolarized or slightly transversely polarized. No significant variation of the polarization is observed versus pT.
© 2003 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.211801
DOI:
10.1103/PhysRevLett.91.211801
PACS:
13.85.Ni, 13.88.+e, 14.40.Nd
*Present address: University of Illinois, Urbana, IL 61801, USA. †Present address: University of Cincinnati, Cincinnati, OH 45221, USA. ‡Present address: Florida State University, Tallahassee, FL 32306, USA. §On leave from Kurchatov Institute, Moscow, Russia. **Present address: Indiana University, Bloomington, IN 61801, USA.
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