Truly neutral particle

In particle physics, a truly neutral particle is a subatomic particle that has no charge quantum number; they are their own antiparticle.: 131  In other words, it remains itself under the charge conjugation, which replaces particles with their corresponding antiparticles.: 135  All charges of a truly neutral particle must be equal to zero. This requires particles to not only be electrically neutral, but also requires that all of their other charges (such as the colour charge) be neutral.

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