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We consider the charge-odd correlations (COC) in cross sections of processesof production of charged particles. The cases of a muonic pair and pion systems$\pi^{+}\pi^{-},\pi^{+}\pi^{-}\pi^{0}$ are considered in detail forelectron-proton or photon-proton collisions in the proton fragmentation regionkinematics. COC arise from interference of amplitudes which describe thedifferent mechanisms of charged leptons (pions) creation. One of themcorresponds to production of particles in the charge-odd state (one virtualphoton or vector meson annihilation to this system of particles) and the othercorresponds to the charge-even state of produced particles (creation by twophotons). COC for muon-antimuon pair creation have a pure QED nature and can beconsidered as a normalization process. The processes with pion production aresensitive to some characteristics of proton wave functions and, besides, can beused for checking the anomalous and normal parts of the effective pioniclagrangian.  Three electromagnetic currents operator matrix element can be measured inphoton-proton interactions with lepton pair production. For this aim acharge-odd combination of cross sections can be constructed as a conversion ofleptonic 3-rank tensor with hadronic ones. These experiments can be consideredas an alternative to deep virtual Compton scattering.Comment: 13 pages, 3 figure

Measuring C-odd correlations at lepton–proton and photon–proton collisions