Production of real photons at large transverse momentum in pp collisions

Journal Article · Sun Oct 01 04:00:00 EDT 1978 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.18.2469· OSTI ID:6614512

Rueckl, R; Brodsky, S J; Gunion, J F

The production of photons at large transverse momentum can be used as a direct probe of quark and gluon subprocesses at short distances. We calculate the cross section for high-p/sub T/ photons produced in pp collisions from lowest-order quantum-chromodynamics (QCD) and higher-order constituent-interchange-model (CIM) processes. We find that CIM terms dominate both ..gamma.. and ..pi.. spectra until very high p/sub T/-although there are regions of s and p/sub T/ where the CIM contributions dominate the ..gamma.. spectrum but the ..gamma.. spectrum already shows the scaling behavior of lowest-order QCD, and also vice versa. We emphasize that in some processes (e.g., gluon + quark ..-->.. photon + quark), the photon is produced without accompanying toward-side hadrons.

• Research Organization: Department of Physics, University of California, Los Angeles, California 90024
• OSTI ID: 6614512
• Journal Information: Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 18:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON-BARYON INTERACTIONS
BOUND STATE
BREMSSTRAHLUNG
CIM MODEL
COMPOSITE MODELS
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FIELD THEORIES
GAMMA SPECTRA
GLUON MODEL
HADRON-HADRON INTERACTIONS
INTERACTIONS
LINEAR MOMENTUM
MASSLESS PARTICLES
MATHEMATICAL MODELS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHOTONS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
RADIATIONS
SCALING LAWS
SPECTRA
TRANSVERSE MOMENTUM
VECTOR DOMINANCE MODEL