Positron

Antiparticle of the electron, having positive electric charge (+1e).

Core Principles & Analysis

• Predicted by Paul Dirac in 1928 and discovered by Carl Anderson in cosmic rays in 1932.
• Annihilates with an electron to produce two 511 keV gamma-ray photons.
• Electron-positron annihilation underlies PET medical imaging.

Specifications & Metrics

• MASS: 0.51099895069 ± 1.6 × 10⁻¹⁰ MeV/c²
• SPIN: 1/2
• SYMBOL: e⁺
• PDG ID: S003
• PDG EDITION: PDG 2026
• PDG NOTE: PDG lists e⁻ and e⁺ under one summary; joined to the shared e record.
• CHARGE: +1 e

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