Physics:Quantum data analysis/Single and Two Particle Densities
Single- and two-particle densities describe how often particles appear in regions of momentum, angle, rapidity, or other phase-space variables. A single-particle density gives the average population of one-particle states, while a two-particle density keeps information about pairs. Together they form the basis for correlation measurements and many studies of particle production.[1]
Single-particle density
A single-particle density measures the yield per event or per collision as a function of variables such as transverse momentum, rapidity, or azimuth. It is often corrected for efficiency, acceptance, and background.[1]
Two-particle density
A two-particle density counts pairs and therefore includes correlations from decays, jets, conservation laws, collective behavior, and quantum-statistical effects. Reference samples are needed to isolate nontrivial correlations.[2]
Analysis role
These densities are building blocks for multiplicity distributions, balance functions, femtoscopy, flow analysis, and jet-correlation studies. Their definitions must specify charge, particle species, event class, and normalization.[3]
See also
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References
- ↑ 1.0 1.1 "Review of Particle Physics". Physical Review D 110 (3): 030001. 2024. doi:10.1103/PhysRevD.110.030001.
- ↑ Cowan, Glen (1998). Statistical Data Analysis. Oxford University Press. ISBN 978-0-19-850156-5.
- ↑ Lyons, Louis (1986). Statistics for Nuclear and Particle Physicists. Cambridge University Press. ISBN 978-0-521-37934-2.
Source attribution: Physics:Quantum data analysis/Single and Two Particle Densities
