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In modern physics, antimatter is defined as matter which is composed of the antiparticles (or "partners") of the corresponding particles of 'ordinary' matter.

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Modelling antiparticles, antileptons, and antimatter
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In modern physics, antimatter is defined as matter which is composed of the antiparticles (or "partners") of the corresponding particles of 'ordinary' matter.
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https://en.wikipedia.org/wiki/Antimatter
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For every lepton flavor, there is a corresponding type of antiparticle, known as an antilepton, that differs from the lepton only in that some of its properties have equal magnitude but opposite sign.
According to certain theories, neutrinos may be their own antiparticle. It is not currently known whether this is the case.
In particle physics, every type of particle is associated with [an] antiparticle with the same mass but with opposite physical charges (such as electric charge).
For example, the antiparticle of the electron is the antielectron (which is often referred to as positron).
While the electron has a negative electric charge, the positron has a positive electric charge, and is produced naturally in certain types of radioactive decay. The opposite is also true: the antiparticle of the positron is the electron.
Positronium (Ps) is a system consisting of an electron and its anti-particle, a positron, bound together into an exotic atom, specifically an onium.
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In theory, a particle and its anti-particle (for example, a proton and an antiproton) have the same mass, but opposite electric charge and other differences in quantum numbers. For example, a proton has positive charge while an antiproton has negative ...
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