Particle physics notation
A standardised system for representing subatomic particles using symbols and quantum numbers. Notation includes the particle name/symbol, mass number (A), and atomic number (Z) written as ᴬ_ᴢX, plus quantum numbers for charge, baryon number, and lepton number used in decay equations.
Real World
CERN physicists use standardised particle notation when publishing results from the Large Hadron Collider — without it, a paper describing a kaon (⁰K⁰) decay could be misread as describing a completely different particle interaction.
Exam Focus
When writing decay equations, always check charge, baryon number, and lepton number balance on both sides before finishing.
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