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The lepton pair production via the quark-antiquark annihilation subprocess incollisions of beam antiproton with the proton target at E_beam = 14 GeV (whichcorresponds to the center-of-mass energy of the p pbar system E_cm = 5.3 GeV)is studied on the basis of the event sample simulated by PYTHIA6 generator andPandaRoot package. Different kinematical variables which may be useful fordesign of the muon system and the electromagnetic calorimeter of the detectorof PANDA experiment at FAIR, as well as for the study of proton structurefunctions in the available x-Q2 kinematical region, are considered. Theproblems due to the presence of fake leptons that appear from meson decays, aswell as due to the contribution of background QCD processes and minimum biasevents, are also discussed. The set of cuts which allows one to separate theevents with the signal lepton pairs from different kind of background eventsare proposed.

On lepton pair production in proton-antiproton collisions at intermediate energies and the main backgrounds