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4 - Conservation Rules and Symmetries
Pascal Paganini, École Polytechnique, Paris
Book:

Fundamentals of Particle Physics

Published online:

31 August 2023

Print publication:

14 September 2023, pp 101-116
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Summary

The notion of symmetry is essential in the determination of particle properties. It reveals quantities that are conserved in collisions or decays. It also constrains the mathematical formulation of theories. This chapter introduces these concepts and explains how the notion of symmetry is implemented in quantum mechanics. It reviews the quantities conserved in particle collisions or decays: energy-momentum and total angular momentum, and also the internal symmetries, such as parity, charge conjugation, baryon and lepton numbers.