A quantum field theoretic treatment of the leading light–cone part of the virtual Compton amplitude is presented. The twist–decomposition of the operators is performed by a group–theoretic procedure respecting the Lorentz group O(3, 1). The twist–2 contributions to the Compton amplitude are calculated and it is shown that the electromagnetic current is conserved for these terms. Relations betwe...

The Compton positron source of a future linear collider must obtain the target bunch population by accumulating a large number of positron packets, arriving either in a number of bursts from a ‘Compton ring’, with intermediate damping of the scattering electron beam, or quasicontinually from a ‘Compton energy recovery linac’. We present simulation results for the longitudinal stacking of Compto...

Recent x-ray Compton scattering experiments in ice have provided useful information about the quantum nature of the interaction between H2O monomers. The hydrogen bond is characterized by a certain amount of charge transfer which could be determined in a Compton experiment. We use ab initio simulations to investigate the hydrogen bond in H2O structures by calculating the Compton profile and rel...

3. Elementary processes in QED Scattering amplitudes and the differential cross-section Kinematics of binary processes, decay rate of an unstable particle The scattering e− e → μ− μ, the square of the scattering amplitude Unpolarized scattering and its differential cross-section The scattering e− μ− → e− μ−, the square of the scattering amplitude Crossing symmetry, Mandelstam variables, crossed...

The Compton effect is commonly cited as a demonstration of the particle feature of light. In this investigation, we present an alternative interpretation of the Compton effect based on the postulates of de Broglie and on the wave scattering from a spaceand timevarying medium, without explicit resort to the conservation of energy and momentum. PACS numbers: 13.60.Fz, 03.65.Ta, 03.75.-b

In a number of papers an attractive method of laser polarization of electrons (positrons) at storage rings or linear colliders has been proposed. We show that these suggestions are incorrect and based on errors in the simulation of multiple Compton scattering and in the calculation of the Compton spin-flip cross sections. We argue that the equilibrium polarization in this method is zero.

A new XMM-Newton observation has made possible a detailed study of both lobes of the radio galaxy Pictor A. Their X-ray emission is of non thermal origin and due to Inverse Compton scattering of the microwave background photons by relativistic electrons in the lobes, as previously found. In both lobes, the equipartition magnetic field (Beq ) is bigger than the Inverse Compton value

We give a short overview of recent developments in understanding of the deeply virtual Compton scattering on the proton target.