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

Conference · Fri Jul 01 04:00:00 EDT 1994

OSTI ID:28386

Tang, W K; Brodsky, S J ^[1]; Vaenttinen, M; Hoyer, P ^[2]

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1. Stanford Linear Accelerator Center, Menlo Park, CA (United States)
2. Univ. of Helsinki (Finland). Dept. of Physics

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.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 28386
• Report Number(s): SLAC-PUB--6576; CONF-9406242--6; ON: DE95008136
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHARMONIUM
CHI1-3510 MESONS
CHI2-3555 MESONS
GLUON-GLUON INTERACTIONS
GLUONS
J PSI-3097 MESONS
LEPTONIC DECAY
PARTICLE PRODUCTION
PERTURBATION THEORY
PION-NUCLEON INTERACTIONS
QUANTUM CHROMODYNAMICS