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Semi-inclusive lambda and K(S) production in p-Au collisions at 17.5 GeV/c
Physical Review Letters
|December 2, 2000
Summary
This study presents the first detailed measurements of strangeness production in proton-nucleus collisions. Lambda and K(S) production show distinct dependencies on collision centrality, deviating from simple scaling observed in proton-proton data.
Area of Science:
- High-energy nuclear physics
- Particle physics
- Quantum chromodynamics
Background:
- Strangeness production in proton-nucleus (p-A) collisions is crucial for understanding particle interactions.
- Previous studies lacked detailed measurements of centrality dependence in p-A systems.
Purpose of the Study:
- To present the first detailed measurements of strangeness production (Lambda and K(S) mesons) in p-A collisions.
- To investigate the centrality dependence of strangeness production as a function of the number of collisions (nu).
Main Methods:
- Measurements were performed in 17.5 GeV/c proton-gold (p-Au) collisions.
- Strangeness production was analyzed as a function of "grey" track multiplicity and the estimated number of collisions (nu).
- Data analysis focused on the differential yields (dn/dy) of Lambda and K(S) particles.
Main Results:
- The Lambda yield increases faster than participant scaling for nu <= 5 and saturates for higher nu.
- K(S) meson multiplicity shows a slower growth with nu compared to Lambda production.
- The observed dependencies indicate a weaker centrality dependence for K&Kmacr; production than for Lambda production.
Conclusions:
- Strangeness production in p-A collisions exhibits complex centrality dependence, deviating from simple scaling laws.
- The distinct behaviors of Lambda and K(S) production provide insights into the underlying mechanisms of particle generation in nuclear environments.
- These findings contribute to a deeper understanding of particle production dynamics in high-energy collisions.
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