Browsing by Author "Ilyichev, A"

Now showing 1 - 4 of 4
  • Thumbnail Image
    ItemOpen Access
    Monte Carlo generator ELRADGEN 2.0 for simulation of radiative events in elastic ep-scattering of polarized particles
    (Computer Physics Communications, 2012-07-01) Akushevich, I; Filoti, OF; Ilyichev, A; Shumeiko, N
    The structure and algorithms of the Monte Carlo generator ELRADGEN 2.0 designed to simulate radiative events in polarized ep-scattering are presented. The full set of analytical expressions for the QED radiative corrections is presented and discussed in detail. Algorithmic improvements implemented to provide faster simulation of hard real photon events are described. Numerical tests show high quality of generation of photonic variables and radiatively corrected cross section. The comparison of the elastic radiative tail simulated within the kinematical conditions of the BLAST experiment at MIT BATES shows a good agreement with experimental data. © 2012 Elsevier B.V. All rights reserved.
  • Thumbnail Image
    ItemOpen Access
    QED radiative effects in the processes of exclusive photon electroproduction from polarized protons with the next-to-leading accuracy
    (Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014-08-01) Akushevich, I; Ilyichev, A; Shumeiko, NM
    Radiative effects in the electroproduction of photons in polarized ep scattering are calculated with next-to-leading-order accuracy. The contributions of loops and two-photon emission are presented in analytical form. The covariant approach of Bardin and Shumeiko is used to extract the infrared divergence. All contributions to the radiative correction are presented in the form of the correction to the leptonic tensor thus allowing for further applications in other experiments, e.g., deep inelastic scattering. The radiative corrections to the cross sections and polarization asymmetries are analyzed numerically for the kinematical conditions of the current measurement at Jefferson Lab. Specific attention is paid to analyzing kinematical conditions for the process with a large radiative effect when the momenta of two photons in the final state are collinear with the momenta of the initial and final electrons, respectively. © 2014 American Physical Society.
  • Thumbnail Image
    ItemOpen Access
    Radiative corrections beyond the ultra relativistic limit in unpolarized ep elastic and Møller scatterings for the PRad Experiment at Jefferson Laboratory
    (European Physical Journal A, 2015-01-01) Akushevich, I; Gao, H; Ilyichev, A; Meziane, M
    © 2015, SIF, Springer-Verlag Berlin Heidelberg.The clear 7σ discrepancy between measurements of the proton charge radius from muonic hydrogen Lamb shifts and those from hydrogen Lamb shift and electron scattering lead to both intense theoretical and experimental efforts to understand and explain this difference. In this regard, a new experiment (PRad) based on unpolarized ep elastic scattering cross section measurements normalized to Møller scattering is underway at Jefferson Laboratory to extract the proton charge radius based on new proton electric form factor down to values of momentum transfer squared Q2, as low as 10−4 GeV/c)2. To reach the precision of the experiment in such a small Q2 region requires reliable knowledge of radiative corrections. In this paper, we present a complete calculation of radiative corrections for unpolarized elastic ep and Møller scatterings performed within a covariant formalism resulting in the set of explicit formulas beyond the ultra relativistic approximation (me2 ≪ Q2), and numerical results for the kinematics of the PRad experiment.
  • Thumbnail Image
    ItemOpen Access
    Radiative effects in the processes of exclusive photon electroproduction from polarized protons
    (Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012-03-28) Akushevich, I; Ilyichev, A
    Radiative effects in the electroproduction of photons in polarized ep scattering are calculated in the leading log approximation and analyzed numerically for kinematical conditions of current measurement at Jefferson Lab. Radiative corrections to the cross sections, their azimuthal distributions, and Fourier coefficients are in particular focus. Kinematical regions where the radiative corrections are considerable are identified. © 2012 American Physical Society.