6533b86efe1ef96bd12cb5ce
RESEARCH PRODUCT
Wide Angle Compton Scattering within the SCET factorization Framework
Nikolay Kivelsubject
Quantum chromodynamicsParticle physicsComputer sciencePhysicsQC1-999Compton scatteringObservableMandelstam variablesEngineering physicsScattering amplitudeFactorizationSoft-collinear effective theoryQuantum field theoryNuclear Experimentdescription
Existing data for the electromagnetic proton form factors and for the cross section of the wide angle Compton scattering (WACS) show that the hard two-gluon exchange mechanism (collinear factorization) is still not applicable in the kinematical region where Mandelstam variables s ~ −t ~ −u are about few GeV2 . On the other hand these observables can be described in phenomenological models where spectator quarks are soft which assumes a large contribution due to the soft-overlap mechanism. It turns out that the simple QCD factorization picture is not complete and must also include the soft-overlap contribution which can be described as a certain matrix element in the soft collinear effective theory (SCET). Then the leading power contribution to WACS amplitude is described as a sum of the hard- and soft-spectator contributions. The existing experimental data allows one to check certain conclusions based on the assumption about dominant role of the soft-spectator mechanism.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-01-01 | EPJ Web of Conferences |