Its interaction with the electroweak force causes the difference between the electromagnetic and the weak forces.  
The Large Electron Positron Collider only saw a trace of it at around 114.9 GeV (giga electron-volts).  Its interaction with the electroweak force causes the difference between the electromagnetic and the weak forces.  It has two isospin states, one with charge +1 and one neutral, but it is unique in the Standard Model because it is the only spin-0 particle.  Proposed to give particles their masses, FTP, identify this hypothetical boson.
The Large Electron Positron Collider only saw a trace of it at around 114.9 GeV (giga electron-volts).  
Higgs Boson