Parallel session 4B
- Carlos Granados (The George Washington University)
Ms Bailing Ma (North Carolina State University)
The fermion degrees of freedom in light-front dynamics (LFD) carry the unique constraint component distinguished from the ordinary equal-time fermion degrees of freedom. The constraint component of the fermion degrees of freedom in LFD results in the instantaneous contribution to the fermion propagator distinguished from the ordinary equal-time forward and backward propagation of relativistic...
Dr Jerzy Przeszowski (University of Białystok)
In the canonical quantization procedure the quantum field operators are smeared with a test function of Schwartz class for coordinates on the quantization hypersurface, with a sharp dependence on the temporal parameter. Such quantum operators when acting on the vacuum state produce smeared 1-particle states and higher number particles states. These states, provided their norm is finite, form...
Dr Anuradha Misra (University of Mumbai)
An important issue in establishing the equivalence of light-front QED in light cone gauge and the Covariant QED is the question of whether to use the two term or the three term propagator for the gauge boson. In this talk, we elaborate on this issue and show, by way of examples, that the equivalence cannot be achieved without including the third term in the photon propagator.
Lubomir Martinovic (Institute of Physics SAS, Bratislava and BLTP JINR Dubna)
Recently, J. Collins has pointed out that vacuum diagrams are, contrary to the general belief, non-vanishing in light-front field theory. In our contribution, we first recall the old (forgotten) arguments by Chang and Ma and by Yan, why this should be so. Then we apply the argument of analyticity of the self-energy diagrams in \lambda\phi^3 and \lambda \phi^4 two-dimensional models in...
Frank Vera (Florida International University)
We calculate the cross section of the electron scattering from a bound nucleon within light-front approximation. The advantage of this approximation is the possibility of systematic account for the off-shell effects which become essential in high energy electro-nuclear processes aimed at probing the nuclear structure at small distances. We derive a new dynamical parameter which allows to...
Christian Weiss (Jefferson Lab)
Measurements of deep-inelastic scattering (DIS) on polarized light ions (deuteron, 3He, ...) address important physics topics such as the spin structure of the neutron, nuclear modifications of parton densities, and coherent effects at small x. Detection of the nuclear breakup state ("spectator tagging") reveals the nuclear configurations present during the high-energy process and permits a...