Abstract: Precise measurement of jet angles plays an important role in events with two
or more jets in final state, where the angles between individual jets has to
be known to fully determine kinematics. This research studies the jet
angular resolution of the ATLAS detector in proton-proton collisions with
the center of mass energy� \sqrt{s} = 8 TeV. The results for full (Geant4) and
fast (Atlfast-II) ATLAS detector simulations are obtained for different
parts of the ATLAS calorimeter system as well as for different energies of
jets and number of primary vertexes of event. Emphasis is made on comparison
of full and fast simulations among them.�
