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High-density QCD and cosmic-ray air showers.

H J Drescher1, A Dumitru, M Strikman

  • 1Johann Wolfgang Goethe University, Postfach 11 19 32, 60054 Frankfurt, Germany.

Physical Review Letters
|August 11, 2005
PubMed
Summary

High-energy particle production in Quantum Chromodynamics (QCD) suggests a lighter cosmic ray composition. Data are sensitive to gluon density evolution, indicating slower growth than previously observed.

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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics (QCD)
  • Cosmic Ray Physics

Background:

  • The high-energy, small-x limit of QCD predicts large gluon densities in hadrons.
  • Understanding particle production in this regime is crucial for interpreting cosmic ray data.

Purpose of the Study:

  • To investigate particle production in the high-energy, small-x limit of QCD.
  • To analyze the impact of gluon density on cosmic ray air showers.
  • To explore sensitivity to different QCD evolution scenarios.

Main Methods:

  • Analysis of particle production in the small-x limit of Quantum Chromodynamics.
  • Modeling of cosmic-ray induced air showers.
  • Comparison with leading-twist models and experimental data.

Main Results:

  • Predicted strong modifications to particle phase-space distributions.
  • Suggests a light composition for hadronic primaries near the Greisen-Zatsepin-Kuzmin cutoff.
  • Cosmic ray data are sensitive to fixed-coupling and running-coupling Balitsky-Fadin-Kuraev-Lipatov evolution scenarios.

Conclusions:

  • The gluon density growth appears slower than at RHIC and HERA, possibly due to running-coupling effects.
  • Cosmic ray observations provide insights into the behavior of QCD at high energies.
  • Results imply a lighter cosmic ray composition at extreme energies.

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