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| In ], the mathematical combination of a ]'s ] and its ] to give a value for the ] of the particle at rest. The ] mass is the same for all frames of reference (see ]). | In ], the mathematical combination of a ]'s ] and its ] to give a value for the ] of the particle at rest. The '''] mass''' is the same for all frames of reference (see ]). | ||
| The invariant mass of a system of decay particles is related to the rest mass of the original particle by the following equation: | The invariant mass of a system of decay particles is related to the rest mass of the original particle by the following equation: | ||
Revision as of 12:27, 29 February 2004
In particle physics, the mathematical combination of a particle's energy and its momentum to give a value for the mass of the particle at rest. The invariant mass is the same for all frames of reference (see Special Relativity).
The invariant mass of a system of decay particles is related to the rest mass of the original particle by the following equation:
Wc=(ΣE)-(Σpc)
where:
- W is the invariant mass of the system of particles
- ΣE is the sum of the energies of the particles
- Σp is the vector sum of the momenta of the particles (includes both magnitude and direction of the momenta)
- c is the speed of light