Azimuthal correlation of gluon jets created in proton-antiproton   annihilation
  Annihilation process of proton and antiproton to guark antiquark pair accompanied by emission of two additional gluon jets with intermediate state of vector meson is considered.Strong azimuthal correlation is revealed of two gluonic jets,effectively created in the same plane.Some applications to cosmic ray events and to LHC experiments are discussed. 
E.A. Kuraev, V.V. Bytev and E.S. Kokoulina
hep-ph nucl-ex