The azimuthal asymmetry of minijet system produced at the early stage of
nucleon-nucleon and nuclear collisions in a central rapidity window is studied.
We show that in pp collisions the minijet transverse energy production in a
central rapidity window is essentially unbalanced in azimuth due to asymmetric
contributions in which only one minijet hits the acceptance window. We further
study the angular pattern of transverse energy flow generated by semihard
degrees of freedom at the early stage of high energy nuclear collisions and its
dependence on the number of semihard collisions in the models both including
and neglecting soft contributions to the inelastic cross section at RHIC and
LHC energies as well as on the choice of the infrared cutoff.Comment: 25 LaTeX pages, 11 figures embedded with epsf; expanded versio