Can experiments differentiate like vs. opposite charges? Two electrons repel, whereas an electron and positron attract. But for macroscopic observers, in the absence of annihilation, could anyone tell whether paths deflected due to attractions or repulsion? Or, is there always annihilation? Anyway, I'd like to know, whether experiments could discern whether neutrinos and antineutrinos have like or opposite weak force hypercharge, due to the way they scatter from each other... I guess if there was evidence of annihilation events then they would be proven to be different and anti particles?