Perturbative QCD calculation of real and virtual Compton scattering

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.41.3348· OSTI ID:6746628

Farrar, G R; Zhang, H ^[1]

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1. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855 (USA)

We present the predictions of perturbative QCD for Compton scattering as a function of photon virtuality. Individual helicity amplitudes are given, along with formulas to permit calculation of the {ital eN}{r arrow}{ital e}{prime}{ital N}{prime}{gamma} amplitudes. We discover remarkable structure in some of the amplitudes as a function of photon virtuality. Since {ital eN}{r arrow}{ital e}{prime}{ital N}{prime}{gamma} contains a contribution from Bethe-Heitler scattering, whose magnitude and phase are known, the phases of the virtual Compton amplitudes can in principle be measured by interference with it. It has been shown that the leading-twist behavior of high-energy, large-angle Compton scattering is not affected by soft physics; thus at sufficiently high energies these predictions provide a stringent test of QCD.

• OSTI ID: 6746628
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 41:11; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645202 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
BASIC INTERACTIONS
BETHE-HEITLER THEORY
COMPTON EFFECT
COMPUTER CODES
D CODES
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTRON-NUCLEON INTERACTIONS
ELEMENTARY PARTICLES
FIELD THEORIES
GAUGE INVARIANCE
HELICITY
INTERACTIONS
INVARIANCE PRINCIPLES
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MASSLESS PARTICLES
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PERTURBATION THEORY
PHOTONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SCATTERING
SCATTERING AMPLITUDES
VIRTUAL PARTICLES