The strong interaction at the collider and cosmic-rays frontiers

Abstract

First data on inclusive particle production measured in proton-proton collisions at the Large Hadron Collider (LHC) are compared to predictions of various hadron-interaction Monte Carlos (QGSJET, EPOS and SIBYLL) used commonly in high-energy cosmic-ray physics. While reasonable overall agreement is found for some of the models, none of them reproduces consistently the sqrt(s) evolution of all the measured observables. We discuss the implications of the new LHC data for the modeling of the non-perturbative and semihard parton dynamics in hadron-hadron and cosmic-rays interactions at the highest energies studied today.

7 pages, Proceeds. Workshop "30 years of strong interactions", Spa, Belgium, 6-8 April 2011. Elsevier to appear

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• Centrality dependence of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC
• Cosmic Rays from the Knee to the Highest Energies
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• Measurement of zero degree single photon energy spectra for sqrt(s) = 7TeV proton-proton collisions at LHC
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• Introduction to the physics of the total cross-section at LHC: A Review of Data and Models
• Strange fireball as an explanation of the muon excess in Auger data
• Nonlinear effects and the behavior of total hadronic and photonic cross sections
• Ultrahigh-energy cosmic rays: Anomalies, QCD, and LHC data