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In quantum mechanics the geometrical dimension of a particles is not exactly defined. An elementary particle (like an electron or a neutrino) is represented by a probability cloud and the cloud dimension (for example the volume where the probability is higher than a certain value) depends on the type of problem. For example the cloud representing an electron bounded to a proton in an hydrogen atom is very different from the dimension of the wave packer representing a free electron, whose dimension depends on the average electron velocity.

An alternative possibility to compare different particles is to compare their mass. Since the relativistic principle of dependence of the mass on velocity holds (that is a particle increases the mass while going speeder and speeder) we have to look at a particle so called "rest mass" that for an elementary fermion like an electron is the mass as measured in a reference where the particle is still.

If we use this definition, gauge bosons like photons or gravitons, that have zero rest mass, are the particles with the smallest rest mass. Their mass however is never really zero (otherwise they would not exist) since they cannot be at rest: a photon for example in every possible reference system always moves at light speed.

Interpretation of the mass of antimatter is also interesting, but seems to me out of the scope of this brief answer.

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