A. Leonidov et D. Ostrovsky, Angular and momentum asymmetry in particle production at high energies - art. no. 094009, PHYS REV D, 6209(9), 2000, pp. 4009
Angular asymmetry and momentum disbalance for a pair of particles produced
at high energy in the central rapidity region are studied. The asymmetry is
substantial for small momenta of produced particles but diminishes when th
ey rise.