antiparticle
Noun: A subatomic particle that has the same mass as its corresponding ordinary matter particle but possesses opposite electric charge and other opposite quantum properties (such as lepton number or baryon number). When a particle and its antiparticle meet, they annihilate each other, converting their mass into energy, typically in the form of gamma-ray photons.
The term is used primarily in the context of particle physics and cosmology to describe the counterpart to standard particles of matter. * The positron is the antiparticle of the electron. * In high-energy collisions, particle-antiparticle pairs can be created. * Understanding antiparticle production is key to studying the early universe.
- "Scientists confirmed the existence of the antiparticle known as the antiproton."
- "Every fundamental particle is theorized to have a corresponding antiparticle."
- "The mutual annihilation of a particle and its antiparticle releases a tremendous amount of energy."
- Antiparticle Symbol: Often denoted by a bar over the particle's symbol (e.g., ( \bar{p} ) for antiproton) or a plus superscript for the positron (( e^+ )).
- Majorana Particle: A hypothetical class of particles that are their own antiparticles. Neutrinos are candidates for being Majorana particles.
- CPT Symmetry: A fundamental theorem stating that the laws of physics are invariant under the combined operations of charge conjugation (particle to antiparticle), parity (spatial inversion), and time reversal.
- Antimatter: (Noun) A substance composed exclusively of antiparticles, such as antiprotons, antineutrons, and positrons.
- Annihilation: (Noun) The process in which a particle and its antiparticle collide and convert into energy or other particles.
- Positron: (Noun) The specific antiparticle of the electron, with a positive electric charge.
- Counterpart
- Conjugate particle
- Pair Production: The converse of annihilation; the creation of a particle and its antiparticle from energy.
- Baryon Asymmetry: The observed cosmic imbalance between matter and antimatter, where very little natural antimatter exists.
- Antiparticle Beam: A stream of antiparticles, such as a positron beam, used in experimental physics and medical imaging (PET scans).
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a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy
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