Abstract
Monte Carlo collision generators describing the multiple production of secondaries in very high energy interactions can be updated taking into account the LHC data available now up to √ s = 8 TeV (3.2 ⋅ 10 16 eV). The energy range of the so-called knee energy region in cosmic ray physics (2 ⋅ 10 15 –10 17 eV) for proton primaries will soon be completely covered by the LHC data. An extension of the model HDPM of CORSIKA has been developed on a base of the recent measurements by LHCb, CMS, TOTEM... The new model GHOST involving a 4-source production is presented here. It correctly reproduces the pseudo-rapidity distributions of charged secondaries and can help the approach of the data in the mid and forward rapidity region, especially in the complex case of TOTEM. In parallel, simulations of cascades and EAS are also carried out in order to understand unexplained results in energy distributions of very high energy γ's.
Highlights
More than important3 decades ago, the CERN results in the energyS p p S range d√ata s provided = 200 −900 GeV implemented rapidly in cosmic ray simulation, especially with the potential of UA5, UA4, UA2, UA1 measurements [1]
This energy range was extended near five years later wh√en the CDF detector started operating at Fermi-lab up to s = 1.8 TeV equivalent to an energy exceeding 1.6 · 1015 eV close to the cosmic ray knee at
Cosmic ray high energy interactions are mainly understood with the “soft physics” data provided by the colliders
Summary
900 GeV implemented rapidly in cosmic ray simulation, especially with the potential of UA5, UA4, UA2, UA1 measurements [1]. Fermi-lab provided consistent results with the CERN measurements, allowing a knowledge of basic features of high energy cosmic ray interactions which were previously established by extrapolations from ISR data. Those circumstances have generated more reliable simulations of EAS exceeding 1015 eV, especially for electron and muon lateral distributions, important to estimate the primary energy. Up to s = 2.36 TeV, all the densities are reproduced with a small incremental tuning of existing models This data concerns mainly the central pseudo rapidity region with η√< 3. In the sections that follow, we shall discuss the new improvements in cosmic simulation suggested by the most recent CMS, results of TOTEM, tLhHe CLbH..C.
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