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