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Lambda(0) polarization in 800-GeV/cpp --> p(f)(Lambda0K+).

J Félix1, M C Berisso, D C Christian

  • 1Universidad de Guanajuato, León, Guanajuato, México.

Physical Review Letters
|February 28, 2002
PubMed
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We studied Lambda(0) polarization in proton-proton collisions. Polarization strongly depends on the Lambda(0)K+ mass, showing positive values at low mass and negative values at high mass, indicating production dynamics are key.

Area of Science:

  • High-energy particle physics
  • Quantum chromodynamics
  • Hadron spectroscopy

Background:

  • Polarization measurements are crucial for understanding particle production mechanisms.
  • Previous experiments, like CERN ISR R608, hinted at mass-dependent polarization in similar systems.

Purpose of the Study:

  • To investigate the polarization of Lambda(0) hyperons in the exclusive reaction pp --> p(f)(Lambda0K+).
  • To analyze the dependence of Lambda(0) polarization on the invariant mass of the Lambda0K+ system.

Main Methods:

  • Utilizing an 800-GeV/c proton beam.
  • Analyzing the exclusive reaction pp --> p(f)(Lambda0K+).
  • Measuring Lambda(0) polarization as a function of Lambda0K+ invariant mass.

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Main Results:

  • Observed a significant dependence of Lambda(0) polarization on the Lambda0K+ invariant mass.
  • Recorded large positive polarization (+71%) at low invariant mass (1.63 GeV/c^2).
  • Recorded large negative polarization (-43%) at high invariant mass (2.75 GeV/c^2).

Conclusions:

  • The observed mass-dependent polarization confirms and extends previous findings.
  • The strong correlation suggests polarization originates from the production dynamics of the diffractively produced Lambda0K+ system.