High-density QCD and Cosmic Ray Air Showers
| Autor: | Adrian Dumitru, M. I. Strikman, H. J. Drescher |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
Quantum chromodynamics
Physics Particle physics High Energy Physics::Lattice Astrophysics::High Energy Astrophysical Phenomena Astrophysics (astro-ph) Hadron High Energy Physics::Phenomenology FOS: Physical sciences General Physics and Astronomy Cosmic ray HERA Jet (particle physics) Astrophysics Gluon Nuclear physics High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Phase space Particle High Energy Physics::Experiment |
| Popis: | We discuss particle production in the high-energy, small-x limit of QCD where the gluon density of hadrons is expected to become nonperturbatively large. Strong modifications of the phase-space distribution of produced particles as compared to leading-twist models are predicted which reflect in the properties of cosmic ray induced air showers in the atmosphere. Assuming hadronic primaries, our results suggest a light composition near GZK cutoff energies. We also show that cosmic ray data discriminate among various QCD evolution scenarios for the rate of increase of the gluon density at small x, such as fixed-coupling and running-coupling BFKL evolution. There are clear indications for a slower growth of the gluon density as compared to RHIC and HERA, due e.g. to running-coupling effects. 5 pages, 1 figure |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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