Polarization as a probe to the production mechanisms of charmonium in {pi}N collisions

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Measurements of the polarization of J/{psi} produced in pion-nucleus collisions are in disagreement with leading twist QCD prediction where J/{psi} is observed to have negligible polarization whereas theory predicts substantial polarization. The authors argue that this discrepancy cannot be due to poorly known structure functions nor the relative production rates of J/{psi} and {chi}{sub j}. The disagreement between theory and experiment suggests important higher twist corrections, as has earlier been surmised from the anomalous non-factorized nuclear A-dependence of the J/{psi} cross section.

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8 p.

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Tang, W.K.; Brodsky, S.J.; Vaenttinen, M. & Hoyer, P. July 1, 1994.

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Description

Measurements of the polarization of J/{psi} produced in pion-nucleus collisions are in disagreement with leading twist QCD prediction where J/{psi} is observed to have negligible polarization whereas theory predicts substantial polarization. The authors argue that this discrepancy cannot be due to poorly known structure functions nor the relative production rates of J/{psi} and {chi}{sub j}. The disagreement between theory and experiment suggests important higher twist corrections, as has earlier been surmised from the anomalous non-factorized nuclear A-dependence of the J/{psi} cross section.

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8 p.

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INIS; OSTI as DE95008136

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  • Workshop on the future of high sensitivity charm experiments, Batavia, IL (United States), 7-9 Jun 1994

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  • Other: DE95008136
  • Report No.: SLAC-PUB--6576
  • Report No.: CONF-9406242--6
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 28386
  • Archival Resource Key: ark:/67531/metadc666398

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  • July 1, 1994

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Feb. 2, 2016, 5:44 p.m.

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Tang, W.K.; Brodsky, S.J.; Vaenttinen, M. & Hoyer, P. Polarization as a probe to the production mechanisms of charmonium in {pi}N collisions, article, July 1, 1994; Menlo Park, California. (digital.library.unt.edu/ark:/67531/metadc666398/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.