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Revision as of 12:29, 20 May 2026
particle is a Book II topic in the Quantum Collection. A quantum particle is a localized excitation, measurable state, or particle-like object described by quantum theory. In particle physics, particles are classified by quantum numbers such as mass, spin, electric charge, color charge, flavor, and lifetime. The concept connects quantum fields, scattering amplitudes, detector events, and the Standard Model organization of matter and forces. A quantum particle is a localized excitation, measurable state, or particle-like object described by quantum theory. In particle physics, particles are classified by quantum numbers such as mass, spin, electric charge, color charge, flavor, and lifetime. The concept connects quantum fields, scattering amplitudes, detector events, and the Standard Model organization of matter and forces.
Overview
Particle physics studies the smallest known building blocks of matter and radiation, together with the interactions that transform them. The Standard Model groups elementary matter particles into fermions and interaction carriers into bosons. Composite particles such as hadrons are built from quarks and gluons, while leptons and gauge bosons are treated as elementary within current experimental resolution.[1]
Quantum description
In quantum mechanics a particle is represented by a state vector or wavefunction, while in relativistic quantum field theory it is described as an excitation of an underlying field. Observable properties such as spin, charge, momentum, and energy are associated with operators and conserved quantities. Interactions are represented through field couplings and are measured through scattering, decay rates, cross sections, and event topologies.[2][3]
Experimental role
Particles are inferred from tracks, calorimeter deposits, missing momentum, invariant masses, and decay patterns. Modern experiments combine accelerators, detectors, trigger systems, reconstruction algorithms, and statistical tests to identify particles and measure their properties. The same particle may appear as a stable detector object, a short-lived resonance, or a virtual contribution to a quantum amplitude.
See also
Table of contents (84 articles)
Index
Full contents
References
- ↑ Halzen, Francis; Martin, Alan D. (1984). Quarks and Leptons: An Introductory Course in Modern Particle Physics. Wiley. ISBN 978-0-471-88741-6.
- ↑ Peskin, Michael E.; Schroeder, Daniel V. (1995). An Introduction to Quantum Field Theory. Addison-Wesley. ISBN 978-0-201-50397-5.
- ↑ Schwartz, Matthew D. (2014). Quantum Field Theory and the Standard Model. Cambridge University Press. ISBN 978-1-107-03473-0.
Source attribution: Physics:Quantum particle