We relate ordinary and skewed parton distributions to soft overlap contributions to elastic form factors and large angle Compton scattering, using light-cone wave functions in a Fock state expansion of the nucleon. With a simple ansatz for the wave functions of the three lowest Fock states we achieve a good description of unpolarised and polarised parton distributions at large x, and of the dat...

The angular distribution of Compton scattering of two quanta originating in the annihilation of a positron with an electron is investigated as a quantum key distribution (QKD) mechanism in the gamma spectral range. The geometry of coincident Compton scattering is observed on the two sides as a way to obtain partially correlated readings on the quantum channel. We derive the noise probability de...

We consider the azimuthal angle dependence in the cross section of the hard leptoproduction of a photon on a nucleon target. We show that this dependence allows to define observables that isolate the twist-two and twist-three sectors in the deeply virtual Compton scattering amplitude. All twist-two and twist-three Compton form factors can be extracted from measurements of the charge odd part of...

We revisit the shocked shell model for the class of Active Galactic Nuclei known as Gigahertz Peak Spectrum sources, incorporating new observational data on the radiation brightness temperatures. We argue that in addition to free–free absorption, induced Compton scattering will also have an important effect in forming the ∼ GHz peak and in shaping the radio spectra that characterize these sourc...

The beam charge asymmetry helps to isolate the real part of the deeply virtual Compton scattering (DVCS) amplitude. It is discussed what information can be gained both from the real and imaginary part of the DVCS amplitude. INTRODUCTION Form factors are the coherent amplitude that the nucleon remains intact when one of its quarks absorbs a certain momentum transfer ∆μ . In this amplitude, the c...

QED Compton scattering at HERA is discussed in terms of the information it may reveal on the proton structure at low momentum transfers Q. Detailed Monte Carlo studies are performed which show that the analysis of inelastic QED Compton events allows the extension of present HERA structure function measurements to a kinematic regime, which up to now was only accessed in fixed target data. For th...

We discuss the application of an effective field theory (EFT) which incorporates the chiral symmetry of QCD to Compton scattering from the proton and deuteron. We describe the chiral EFT analysis of the γp scattering database presented in our recent review [1], which gives: α E1 = 10.5± 0.5(stat)± 0.8(theory) , β (p) M1 = 2.7± 0.5(stat)± 0.8(theory), for the electric and magnetic dipole polariz...

I introduce a gauge invariant decomposition of the nucleon spin into quark helicity, quark orbital, and gluon contributions. The total quark (and hence the quark orbital) contribution is shown to be measurable through virtual Compton scattering in a special kinematic region where single quark scattering dominates. This deeply-virtual Compton scattering (DVCS) has much potential to unravel the q...

Without collisions, the largest contribution to the beam lifetime in LEP is Compton scattering off thermal photons. Even if only a few particles are scattered in a single pass, the potential background generated could make this effect important for the NLC as well. We used a modified version of the tracking program DIMAD, which includes a Monte Carlo simulation for the Compton scattering on the...

Real Compton Scattering (RCS) in the hard scattering limit is a powerful probe of the short-distance structure of the nucleon. It is a natural complement to other hard exclusive reactions that are currently being pursued at Jefferson Laboratory (JLab) and elsewhere, such as high Q elastic form factors, hard pion electroproduction and photoproduction, and Virtual Compton Scattering (VCS), and De...