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An antineutrino is the antimatter particle (or antiparticle) associated with a standard neutrino.

Since the neutrino has 0 electric charge, the antineutrino also has 0 electric charge. Both particles also have quantum spin of 1/2. It is therefore possible that the neutrino and antineutrino are actually the same particle instead of two different particles. A particle that is its own antiparticle is called a Majorana fermion and was first theorized in 1937, but further research is needed to determine if this is the case for neutrinos.

The one property that is known to be different is the chirality of the particle. Standard neutrinos have a left-handed helicity, while antineutrinos have been observed to have a right-handed helicity.

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