The neutral intermediate vector boson, which has a mass about 178,450 times that of an electron and mediates weak interactions in which the charges of participating particles do not change.
An electrically neutral subatomic particle that mediates the weak nuclear force. The Z boson has a mass 182,000 times that of the electron. Unlike the other weak force mediator (the W boson), it does not change particles it interacts with into other types of particles. Like the photon , the Z boson is its own antiparticle.