Two-photon-exchange continuum contribution to elastic lepton-hadron scattering amplitudes

Journal Article · Mon Jun 01 00:00:00 EDT 1987 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.35.3310· OSTI ID:5892488

Bordes, J; Pearrocha, J A; Bernabeu, J

We calculate the constant piece of the two-photon-exchange continuum contribution to the elastic lepton-hadron scattering amplitudes, which is dominant in a low-momentum-transfer expansion. We work it out on the basis of unitary, analyticity, Lorentz covariance, and gauge invariance. This constant piece coincides with the forward two-photon-exchange continuum amplitude. Its calculation opens a way to evaluate the asymmetry for positive- and negative-lepton--nucleus scattering at low-momentum transfer. The results are given in terms of the hadronic photoabsorption cross section, which is an experimental input in our calculation. Predictions of the amplitudes for leptons scattered by /sup 4/He and /sup 12/C are given.

• Research Organization: Department de Fisica Teo-grave-accentrica, Universitat de Valencia, Burjassot, Valencia, Spain
• OSTI ID: 5892488
• Journal Information: Phys. Rev. D; (United States), Vol. 35:11
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CARBON 12 TARGET
LEPTON REACTIONS
HELIUM 4 TARGET
ELASTIC SCATTERING
LEPTON-HADRON INTERACTIONS
ASYMMETRY
COMPTON EFFECT
CROSS SECTIONS
DISPERSION RELATIONS
EXCHANGE INTERACTIONS
GAUGE INVARIANCE
MOMENTUM TRANSFER
PHOTONS
SCATTERING AMPLITUDES
SPIN
SPINORS
AMPLITUDES
ANGULAR MOMENTUM
BASIC INTERACTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
INTERACTIONS
INVARIANCE PRINCIPLES
MASSLESS PARTICLES
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
SCATTERING
TARGETS
645202* - High Energy Physics- Particle Interactions & Properties-Theoretical- Electromagnetic Interactions & Properties