Confronting models on cosmic ray interactions with particle physics at LHC energies

Details Confronting models on cosmic ray interactions with particle physics at LHC energies Confronting models on cosmic ray interactions with particle physics at LHC energies

2007-02-23

arxiv.org/abs/hep-ph/0702238v2

Eur.Phys.J.C52:673-681,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages revtex, 8 figures, added references

Scientific paper

10.1140/epjc/s10052-007-0412-6

Inelastic pp collisions are dominated by soft (low momentum transfer) physics where perturbative QCD cannot be fully applied. A deep understanding of both soft and semi-hard processes is crucial for predictions of minimum bias and underlying events of the now coming on line pp Large Hadron Collider (LHC). Moreover, the interaction of cosmic ray particles entering in the atmosphere is extremely sensitive to these soft processes and consequently cannot be formulated from first principles. Because of this, air shower analyses strongly rely on hadronic interaction models, which extrapolate collider data several orders of magnitude. A comparative study of Monte Carlo simulations of pp collisions (at the LHC center-of-mass energy ~ 14 TeV) using the most popular hadronic interaction models for ultrahigh energy cosmic ray (SIBYLL and QGSJET) and for collider physics (the PYTHIA multiparton model) is presented. The most relevant distributions are studied including those observables from diffractive events with the aim of discriminating between the different models.

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