Journal
ASTROPARTICLE PHYSICS
Volume 35, Issue 2, Pages 98-113Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.astropartphys.2011.05.002
Keywords
Ultra-high-energy cosmic rays; Hadron-hadron collisions; LHC; QCD
Funding
- Bundesministerium fur Bildung und Forschung (BMBF) [05A08VK1]
- EU [FP7-ERG-2008-235071]
- FP7 Marie Curie program [FP7-IEF-2007-220251]
- program Romforskning of Norsk Forskningsradet
- ICREA Funding Source: Custom
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The determination of the primary energy and mass of ultra-high-energy cosmic-rays (UHECR) generating extensive air-showers in the Earth's atmosphere, relies on the detailed modeling of hadronic multiparticle production at center-of-mass (cm.) collision energies up to two orders of magnitude higher than those studied at particle colliders. The first Large Hadron Collider (LHC) data have extended by more than a factor of three the c.m. energies in which we have direct proton-proton measurements available to compare to hadronic models. In this work we compare LHC results on inclusive particle production at energies root s = 0.9. 2.36, and 7 TeV to predictions of various hadronic Monte Carlo (MC) models used commonly in cosmic-ray (CR) physics (QGSJET, EPOS and SIBYLL). As a benchmark with a standard collider physics model we also show PYTHIA (and PHOJET) predictions with various parameter settings. While reasonable overall agreement is found for some of the MC, none of them reproduces consistently the root s evolution of all the observables. We discuss implications of the new LHC data for the description of cosmic-ray interactions at the highest energies. (C) 2011 Elsevier B.V. All rights reserved.
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