  This paper presents an analysis of electron-ion recombination processes in
ionization tracks of recoiled atoms in liquid argon (LAr) detectors. The
analysis is based on the results of computer simulations which use realistic
models of electron transport and reactions. The calculations reproduce the
recent experimental results of the ionization yield from 6.7 keV nuclear
recoils in LAr. The statistical distribution of the number of electrons that
escape recombination is found to deviate from the binomial distribution, and
estimates of recombination fluctuations for nuclear recoils tracks are
obtained. A study of the recombination kinetics shows that a significant part
of electrons undergo very fast static recombination, an effect that may be
responsible for the weak drift-field dependence of the ionization yield from
nuclear recoils in some noble liquids. The obtained results can be useful in
the search for hypothetical dark matter particles and in other studies that
involve detection of recoiled nuclei.
