In the simplest scheme a proton interacts on a nucleus or a photon and produces neutral and charged pions giving respectively photons, and 2 nm and one ne (no difference is made between neutrinos and anti-neutrinos since they give the same signature in the detector). 

 

p + A/g ® p° + p± + ...
    ¯   ¯    
    gg   m± nm  
        ¯    
        e± nm ne

Author : Thierry Stolarczyk