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| where: | where: | ||
| :W is the invariant mass of the system of particles | : W is the invariant mass of the system of particles | ||
| :ΣE is the sum of the energies of the particles | : ΣE is the sum of the energies of the particles | ||
| :Σp is the vector sum of the ] of the particles (includes both magnitude and direction of the momenta) | : Σp is the vector sum of the ] of the particles (includes both magnitude and direction of the momenta) | ||
| :c is the speed of light | : c is the speed of light | ||
| ==See also== | == See also == | ||
| *] | |||
| * ] |
* ] | ||
| * ] | |||
| ] | ] | ||
Revision as of 21:24, 2 December 2005
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