Probing gluon polarization in hadronic direct photon production

Journal Article · Tue Aug 01 00:00:00 EDT 1989 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.40.778· OSTI ID:5889462

Berger, E L; Qiu, J

Inclusive direct photon production at large transverse momentum in proton-proton interactions with a longitudinally polarized beam and target is an incisive probe of the polarized gluon density in a proton. To help motivate future experiments and assist in their design, we provide predictions of the polarization asymmetry for a range of reasonable choices of the polarized gluon density. The cross sections are small at fixed-target energies, but the effort to measure them is necessary if the polarized gluon density /Delta//ital G/(/ital x/,/ital Q//sup 2/) is to be determined. In order to obtain our predictions, we parametrize spin-dependent parton densities and compute their evolution with /ital Q//sup 2/. Our densities provide good agreement with the spin-dependent structure function /ital g//sub 1//sup /ital p//(x,/ital Q//sup 2/) measured in deep-inelastic lepton scattering.

• Research Organization: High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (US)
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 5889462
• Journal Information: Phys. Rev. D; (United States), Vol. 40:3
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
GLUONS
POLARIZATION
PHOTONS
PARTICLE PRODUCTION
PROTON-PROTON INTERACTIONS
INCLUSIVE INTERACTIONS
ASYMMETRY
CROSS SECTIONS
DEEP INELASTIC SCATTERING
HELICITY
PARTON MODEL
POLARIZED BEAMS
POLARIZED TARGETS
QUANTUM CHROMODYNAMICS
QUARK MODEL
SPIN
STRUCTURE FUNCTIONS
ANGULAR MOMENTUM
BARYON-BARYON INTERACTIONS
BEAMS
BOSONS
COMPOSITE MODELS
ELEMENTARY PARTICLES
FIELD THEORIES
FUNCTIONS
HADRON-HADRON INTERACTIONS
INELASTIC SCATTERING
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
POSTULATED PARTICLES
PROTON-NUCLEON INTERACTIONS
QUANTUM FIELD THEORY
SCATTERING
TARGETS
645203* - High Energy Physics- Particle Interactions & Properties-Theoretical- Weak Interactions & Properties
645400 - High Energy Physics- Field Theory