J/Psi 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; G. S. Kyle; P. L. McGaughey; W. M. Lee; M. J. Leitch; J. M. Moss; B. A. Mueller; V. Papavassiliou; J. C. Peng; G. Petitt; 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

doi:10.1103/PhysRevLett.91.211801

J/Psi Polarization in 800-GeV p-Cu Interactions

High Energy Physics - Experiment 2008-11-26 v1

Authors: 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 , G. S. Kyle , P. L. McGaughey , W. M. Lee , M. J. Leitch , J. M. Moss , B. A. Mueller , V. Papavassiliou , J. C. Peng , G. Petitt , 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

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Abstract

We present measurements of the polarization of the $J/\psi$ produced in 800-GeV proton interactions with a copper target. Polarization of the $J/\psi$ is sensitive to the $c \bar{c}$ production and hadronization processes. A longitudinal polarization is observed at large $x_{F}$ , while at small $x_{F}$ the state is produced essentially unpolarized or slightly transversely polarized. No significant variation of the polarization is observed versus $p_{T}$ .

Keywords

J/Psi polarization p-Cu interactions charm production hadronization x_F dependence p_T dependence

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@article{arxiv.hep-ex/0308001,
  title  = {J/Psi Polarization in 800-GeV p-Cu Interactions},
  author = {T. H. Chang and M. E. Beddo and C. N. Brown and T. A. Carey and W. E. Cooper and C. A. Gagliardi and G. T. Garvey and D. F. Geesaman and E. A. Hawker and X. C. He and L. D. Isenhower and D. M. Kaplan and S. B. Kaufman and D. D. Koetke and G. S. Kyle and P. L. McGaughey and W. M. Lee and M. J. Leitch and J. M. Moss and B. A. Mueller and V. Papavassiliou and J. C. Peng and G. Petitt and P. E. Reimer and M. E. Sadler and W. E. Sondheim and P. W. Stankus and R. S. Towell and R. E. Tribble and M. A. Vasiliev and J. C. Webb and J. L. Willis and G. R. Young},
  journal= {arXiv preprint arXiv:hep-ex/0308001},
  year   = {2008}
}

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4 pages, 3 figures

J/Psi Polarization in 800-GeV p-Cu Interactions

Abstract

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