Speaker
Description
The end point model is based on the assumption that exclusive
hadronic processes at large momentum transfer get dominant contribution
from the kinematic region corresponding to Feynman x approximately equal
to one. The reaction proceeds by hard scattering of only one of the quarks
while the remaining quarks act as soft spectators. The process involves
non-perturbative physics and we are required to model the hadron wave
function. However we can extract the x-dependence of the wave function
from the form factor data. This x-dependence correctly predicts the observed
scaling laws of exclusive processes both at large (fixed) center of mass
scattering angle as well as fixed center of mass energy (s). The formalism
applies at laboratory energies and also leads to the observed
scaling behaviour of F2/F1. The scaling laws do not depend on the detailed
modelling of the hadron wave function. The formalism can also be
used to make detailed prediction of the magnitude of the cross sections.
However these depend on the hadron wave function model as well as the
soft spectator quark kernel. We present a detailed calculation of
Compton scattering within this framework.
