Perturbative QCD predictions for two-photon exchange

Simple item page
dc.creatorBorisyuk, Dmitry
dc.creatorKobushkin, Alexander
dc.date2008-11-03
dc.date.accessioned2026-07-07T12:44:00Z
dc.date.available2026-07-07T12:44:00Z
dc.descriptionWe study two-photon exchange (TPE) in the elastic electron-nucleon scattering at high Q^2 in the framework of pQCD. The obtained TPE amplitude is of order alpha/alpha_s with respect to Born approximation. Its shape and value are sensitive to the choice of nucleon wavefunction, thus study of TPE effects can provide important information about nucleon structure. With the wavefunctions based on QCD sum rules, TPE correction to the electron-proton cross section has negative sign, is almost linear in epsilon and grows logarithmically with Q^2 up to 7% at Q^2 = 30 GeV^2. The results of existing "hadronic" calculations, taking into account just the nucleon intermediate state, can be smoothly connected with pQCD result near Q^2 = 3 GeV^2. Above this point two methods disagree, which implies that "hadronic" approach becomes inadequate at high Q^2. Other relevant observables, such as electron/positron cross section ratio, are also discussed.
dc.identifierhttps://arxiv.org/abs/0811.0266
dc.identifierhttp://arxiv.org/abs/0811.0266
dc.identifierPhys.Rev.D79:034001,2009
dc.identifierdoi:10.1103/PhysRevD.79.034001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220619
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Experiment
dc.subjectNuclear Theory
dc.titlePerturbative QCD predictions for two-photon exchange
dc.typetext

Files

Collections

arXiv