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The determination of the primary energy and mass of ultra-high-energycosmic-rays (UHECR) generating extensive air-showers in the Earth's atmosphere,relies on the detailed modeling of hadronic multiparticle production atcenter-of-mass (c.m.) collision energies up to two orders of magnitude higherthan 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 wehave direct proton-proton measurements available to compare to hadronic models.In this work we compare LHC results on inclusive particle production atenergies sqrt(s) = 0.9, 2.36, and 7 TeV to predictions of various hadronicMonte Carlo (MC) models used commonly in cosmic-ray (CR) physics (QGSJET, EPOSand SIBYLL). As a benchmark with a standard collider physics model we also showPYTHIA (and PHOJET) predictions with various parameter settings. Whilereasonable overall agreement is found for some of the MC, none of themreproduces consistently the sqrt(s) evolution of all the observables. Wediscuss implications of the new LHC data for the description of cosmic-rayinteractions at the highest energies.

Constraints from the first LHC data on hadronic event generators for ultra-high energy cosmic-ray physics