How to prove the existence of graviton, boson? What is the
smallest particle found? How come a particle has no charge, no
mass and no existence? Gravitons are still theoretical. The
smallest particle with non-zero rest mass is still the electron.
The neutrino is a particle with zero rest mass (maybe) and no
charge: it carries only spin and momentum. Click here to return
to the Physics Archives Update: June 2012