Probing Nonrelativistic QCD Factorization in Polarized J/{psi} Photoproduction at Next-to-Leading Order

Journal Article · Fri Dec 02 00:00:00 EST 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.107.232001· OSTI ID:21612334

Butenschoen, Mathias; Kniehl, Bernd A ^[1]

---

1. II. Institut fuer Theoretische Physik, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg (Germany)

We analyze the polarization observables of J/{psi} photoproduction at next-to-leading order within the factorization formalism of nonrelativistic quantum chromodynamics (NRQCD). This is a complete next-to-leading-order study of heavy-quarkonium polarization including the full relativistic corrections due to the intermediate {sup 1}S{sub 0}{sup [8]}, {sup 3}S{sub 1}{sup [8]}, and {sup 3}P{sub J}{sup [8]} color-octet states closing a gap in the worldwide endeavor to test NRQCD factorization at the quantum level. We present theoretical predictions in the helicity, target, and Collins-Soper frames of DESY HERA, evaluated using the color-octet long-distance matrix elements previously extracted through a global fit to experimental data of unpolarized J/{psi} production, and confront them with recent measurements by the H1 and ZEUS Collaborations. We find the overall agreement to be satisfactory but the case for NRQCD to be not as strong as for the J/{psi} yield.

• OSTI ID: 21612334
• Journal Information: Physical Review Letters, Vol. 107, Issue 23; Other Information: DOI: 10.1103/PhysRevLett.107.232001; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COLOR MODEL
FACTORIZATION
HELICITY
HERA STORAGE RING
J PSI-3097 MESONS
MATRIX ELEMENTS
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PHOTOPRODUCTION
POLARIZATION
QUANTUM CHROMODYNAMICS
QUARKONIUM
RELATIVISTIC RANGE
BASIC INTERACTIONS
BOSONS
CHARMONIUM
COMPOSITE MODELS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FIELD THEORIES
HADRONS
INTERACTIONS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MESONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
QUANTUM FIELD THEORY
QUARK MODEL
SPECTROMETERS
STORAGE RINGS
VECTOR MESONS