Hadroproduction and polarization of charmonium

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.51.3332· OSTI ID:6547057

Vaenttinen, M ^[1]; Hoyer, P ^[2]; Brodsky, S J; Tang, W ^[3]

---

1. Research Institute for Theoretical Physics, and University of Helsinki (Finland)
2. Department of Physics, University of Helsinki (Finland)
3. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (United States)

In the limit of heavy-quark mass, the production cross section and polarization of quarkonia can be calculated in perturbative QCD. We study the [ital p][sub [perpendicular]]-averaged production of charmonium states in [pi][ital N] collisions at fixed target energies. The data on the relative production rates of [ital J]/[psi] and [chi][sub [ital J]] are found to disagree with leading twist QCD. The polarization of the [ital J]/[psi] indicates that the discrepancy is not due to poorly known parton distributions nor to the size of higher order effects ([ital K] factors). Rather, the disagreement suggests important higher twist corrections, as has been surmised earlier from the nuclear target [ital A] dependence of the production cross section.

• DOE Contract Number: AC03-76SF00515
• OSTI ID: 6547057
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 51:7; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662230 -- Quantum Chromodynamics-- (1992-)
662340* -- Hadron Interactions-- (1992-)
662420 -- Properties of Mesons & Meson Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CHARMONIUM
CROSS SECTIONS
ELEMENTARY PARTICLES
FIELD THEORIES
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PERTURBATION THEORY
PION-NUCLEON INTERACTIONS
POLARIZATION
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKONIUM