  The value of the pair distribution function g(r) at contact (r = 0) in a
quantum electron gas is determined by the scattering events between pairs of
electrons with antiparallel spins. The theoretical results for g(0) as a
function of the coupling strength r_s in the paramagnetic electron gas in
dimensionality D=2 and 3, that have been obtained from the solution of the
two-body scattering problem with a variety of effective scattering potentials
embodying many-body effects, are compared with the results of many-body
calculations in the ladder approximation and with quantum Monte Carlo data.
