Threshold neutral pion electroproduction on the deuteron is studied in the framework of baryon chiral perturbation theory at next-to-leading order in the chiral expansion. To this order in small momenta, the amplitude is finite and a sum of twoand three-body interactions with no undetermined parameters. We calculate the S-wave multipoles for threshold production and the deuteron S-wave cross se...

Exclusive π 0 electroproduction from nucleons can be related to transversity, the tensor charge, and other quantities related to transversity. This process isolates C-parity odd and chiral odd combinations of t-channel exchange quantum numbers. In a hadronic picture the meson production amplitudes for intermediate energy and Q 2 are determined by C–odd Regge exchanges with final state interacti...

The investigation of the quark-gluon dynamics through perturbative calculations is most useful to extract from experimentally measurable observables quantities such as parton distributions, generalized parton distributions (GPDs) and (generalized) distribution amplitudes (GDAs, DAs). Factorization theorems allow to calculate scattering amplitudes in a perturbative way, provided a renormalizatio...

In all Jlab hypernuclear electroproduction experiments already performed (E89-009, E94107, E01-011) or approved (E05-015) the K mesons are detected at very small (few degrees) laboratory scattering angels (measured with respect to virtual photon momentum). This region of kaon scattering angles is not covered, unfortunately, by recent photoand electroproduction data on the elementary production ...

In this talk I am going to report on an ongoing analysis [1, 2, 3] of hard electroproduction of light vector mesons within the handbag approach which is based on QCD factorization into hard subprocesses and generalized parton distributions (GPDs) encoding the soft, nonperturbative physics. As is well-known the leading-twist contribution (i.e. employing the collinear approximation) evaluated to ...

We investigate the exclusive electroproduction of π mesons from nucleons. To leading twist, leading order αs accuracy the corresponding production amplitude can be decomposed into pseudovector and pseudoscalar parts. Both can be expressed in terms of quark double distribution functions of the nucleon. While the pseudovector contribution is connected to ordinary polarized quark distributions, th...

The inclusive electroproduction of hadrons is measured from hydrogen and deuterium targets. The exchanged virtual photons are in the kinematic range -0.25 > cl2 > -3.00 GeV2, 12 <s < 30 GeV2. Hadrons which travel in the direction of the virtual photon in the virtual photon-nucleon center-of-mass system are detected. A striking difference from photoproduction is observed in the excess of positiv...