6533b7d4fe1ef96bd12630a4
RESEARCH PRODUCT
Gauge invariance of the deeply virtual Compton scattering amplitude
Bernard PireI. V. AnikinO. V. Teryaevsubject
Quantum chromodynamicsPhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsHigh Energy Physics::LatticeHigh Energy Physics::PhenomenologyCompton scatteringInelastic scatteringDeep inelastic scattering01 natural sciencesScattering amplitudeAmplitudePionQuantum electrodynamics0103 physical sciencesHigh Energy Physics::ExperimentGauge theoryNuclear Experiment010306 general physicsdescription
We analyze in detail the problem of gauge invariance of the deeply virtual Compton scattering (DVCS) amplitude. Using twist-3 one-gluon exchange diagram contributions and the QCD equations of motion, we derive the general gauge invariant expression of the DVCS amplitude on a (pseudo)scalar particle (pion, ${\mathrm{He}}^{4}).$ Similarly to the case of deep inelastic scattering, the amplitude does not depend on the twist-3 quark-gluon correlations at the Born level. The contribution of the derived amplitude to the single-spin asymmetry with longitudinally polarized lepton is calculated.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-08-29 | Physical Review D |