Kinematic Power Corrections in Off-Forward Hard Reactions

Analyticity and power corrections in hard-scattering hadronic functions

Demanding the analyticity of hadronic observables (calculated in terms of power series of the running coupling) as a whole, we show that they are free of the Landau singularity. Employing resummation and dispersion-relation techniques, we compute in a unifying way power corrections to two different hard-scattering functions in perturbative QCD: the electromagnetic pion form factor to leading or...

Radiative Corrections to Neutrino Reactions off Proton and Deuteron

Radiative corrections are calculated for antineutrino proton quasielastic scattering, neutrino deuteron scattering, and the asymmetry of polarised neutron beta decay from which GA/GV is determined. A particular emphasis is given to the constant parts that are usually absorbed into the coupling constants, and thereby those that appear in the processes that concern us are unambiguously tied among...

Wavefunction corrections and off-forward gluon distributions in diffractive J/ψ electroproduction

Diffractive production of J/Ψ particles by virtual photons on a proton target is studied with a view towards understanding two important corrections to the leading order result. First, the effect of Fermi motion of the heavy quarks is studied by performing a systematic expansion in the relative velocity, and a simple correction factor is derived. This is considerably less than estimated previou...

Institutional Corrections and Hard Technology

Power Corrections in QCD

This article provides a review of progress made in understanding inverse power law corrections 1/Q where Q is the hard scale involved in a given QCD process. Particular attention will be paid to HERA results. § [email protected] Power Corrections in QCD 2