Electroweak theory provides for the existence of two neutral particles: one being the photon and the other being, FTP, what boson, the neutral counterpart of the charged W particle?
Studies at CERN show that they decay into three types of neutrino, which indicates that there are only three sets of leptons and quarks.  Having a mass about 100 times greater than the proton, they have been observed in collisions between protons and antiprotons, and have been used to explain "neutral current" interactions between electrons and neutrinos.  Electroweak theory provides for the existence of two neutral particles: one being the photon and the other being, FTP, what boson, the neutral counterpart of the charged W particle?
Studies at CERN show that they decay into three types of neutrino, which indicates that there are only three sets of leptons and quarks.  
Z particle