Karlsruhe 2011 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 22: Astroteilchenphysik und Kosmologie (Theorie)
T 22.9: Vortrag
Mittwoch, 30. März 2011, 18:45–19:00, 30.23: 3-1
Comparison of hadronic-interaction models for cosmic-ray physics with first LHC data — •Tanguy Pierog1, David D'Enterria2, Ralph Engel1, Sergey Ostapchenko3,4, and Klaus Werner5 — 1Karlsruhe Institut of Technology, Institut für Kernphysik, Karlsruhe, Germany — 2CERN, PH Department, Geneva, Switzerland — 3NTNU, Inst. for Fysikk, Trondheim, Norway — 4D.V. Skobeltsyn Inst. Nuc. Phys, Moscow State Univ., Moscow, Russia — 5SUBATECH, Nantes, France
The determination of the primary energy and type of high-energy cosmic-rays, generating extensive air-showers in the Earth's atmosphere, relies on the detailed modeling of hadronic multiparticle production. The first LHC results have extended considerably the energy range in which we have direct measurements available. In this work we compare the LHC data on inclusive particle production at center of mass energies 0.9, 2.36, and 7 TeV to predictions of various hadronic Monte Carlo models used commonly in cosmic-ray physics. For comparison with a standard collider physics model we also show PYTHIA predictions with various parameter settings. While reasonable overall agreement is found for some of the models, none of them reproduces consistently the energy evolution of all the observables. We discuss implications of the new LHC data for the description of cosmic-ray interactions at very high energy and point out some measurements that can be done to further reduce the uncertainties of air-shower modeling.