Abstract
Modeling of high energy hadronic and nuclear interactions by the QGSJET-II generator is discussed. Recent updates related to the treatment of nonlinear effects inthe interaction dynamics and to the model calibration with new LHC data are described. A special attention is devoted to the predictions of the new model version forcharacteristics of extensive air showers initiated by high energy cosmic rays. In particular, an improved description of charge exchange processes in pion collisionsis discussed and the respective enhancement of the shower muon content is analyzed.
Highlights
Despite the long history of high energy cosmic ray (CR) studies, there remain numerous unsolved problems in the field
A special attention is devoted to the predictions of the new model version for characteristics of extensive air showers initiated by high energy cosmic rays
Apart from purely experimental challenges, a serious uncertainty in the interpretation of data is related to the description of nuclear-electromagnetic cascades in the atmosphere - extensive air showers (EAS) - which are the main tool for detecting CR primaries in very high energy range
Summary
Despite the long history of high energy cosmic ray (CR) studies, there remain numerous unsolved problems in the field. Apart from purely experimental challenges, a serious uncertainty in the interpretation of data is related to the description of nuclear-electromagnetic cascades in the atmosphere - extensive air showers (EAS) - which are the main tool for detecting CR primaries in very high energy range. The largest part of that uncertainty stems from the treatment of hadron-air interactions in the shower by corresponding models since the latter have to be extrapolated from much lower accelerator energies. There is a strong hope that new data will substantially constrain EAS simulation procedures and contribute to a successful resolution of ultra-high energy cosmic ray (UHECR) puzzles. In the following I discuss recent updates of the QGSJET-II hadronic interaction model [1,2,3], both concerning improvements in the underlying theoretical framework and regarding its re-calibration with new LHC data. A special emphasis will be given to how those modifications impact the predicted EAS characteristics
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