Subatomic particle with a mass close to zero
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NEUTRINOSubatomic particle with a mass close to zero
neutrinosA neutral subatomic particle with a mass close to zero and half-integral spin, rarely reacting with normal matter. Three kinds of neutrinos are known, associated with the electron, muon, and tau particle
positronsA subatomic particle with the same mass as an electron and a numerically equal but positive charge
PHOTONParticle with zero mass
axiona hypothetical subatomic particle of low mass and energy that is postulated to exist because of certain properties of the strong force
photonsA particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass
gravitonthe theoretical quantum of gravitation, usually assumed to be an elementary particle that is its own antiparticle and that has zero rest mass and charge and a spin of two