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Measurements of strange and double-strange hyperons in proton-lead collisions reveal constant ratios of excited to ground-state hyperons. Yield ratios to pions increase with particle strangeness and event multiplicity.

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Area of Science:

  • High-energy nuclear physics
  • Particle physics
  • Quantum chromodynamics

Background:

  • Understanding particle production in high-energy collisions is crucial for probing the properties of nuclear matter.
  • Strange and double-strange hyperons offer unique insights into the dynamics of quark-gluon interactions.

Purpose of the Study:

  • To measure the transverse momentum distributions of hyperon resonances (, ) in proton-lead (p-Pb) collisions.
  • To investigate the dependence of hyperon production on charged-particle multiplicity density (d/d).
  • To compare hyperon production with previous findings and study strangeness content effects.

Main Methods:

  • Utilized data from p-Pb collisions at TeV.
  • Analyzed transverse momentum distributions within a specific rapidity range.
  • Examined event classes based on charged-particle multiplicity densities (d/d).

Main Results:

  • Mean transverse momentum of hyperons presented as a function of d/d and particle mass.
  • Integrated yield ratios of excited to ground-state hyperons found to be constant with d/d.
  • Yield ratios to pions increase with d/d, correlating with strangeness content.

Conclusions:

  • The production of strange and double-strange hyperons shows distinct behavior concerning event multiplicity.
  • The observed trends in hyperon-to-pion ratios provide constraints on models of particle production in heavy-ion collisions.