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. 2003 Nov 21;91(21):211801.
doi: 10.1103/PhysRevLett.91.211801. Epub 2003 Nov 21.

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

T H Chang  1 , 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 Papavassiliou, J 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; FNAL E866/NuSea Collaboration
Affiliations

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

T H Chang et al. Phys Rev Lett. .

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 ccmacr; 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).

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