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26 April 2024

» arxiv » hep-ex/0308001

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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 ;
Date:	31 Jul 2003
Journal:	Phys.Rev.Lett. 91 (2003) 211801
Subject:	hep-ex
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 ar{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} $.
Source:	arXiv, hep-ex/0308001
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