Abstract
After a brief introduction to extended air shower cosmic ray physics the current and future deployment of forward detectors at ATLAS is discussed along with the various aspects of the current and future ATLAS programs to explore hadronic physics. The emphasis is placed on those results and future plans that have particular relevance for high-energy, and ultra high-energy, cosmic ray physics. The possible use of ATLAS as an “underground” cosmic muon observatory is briefly considered.
Highlights
Over the past ten years or so ATLAS has been involved in developing the detector coverage in the forward direction in order to expand the physics horizons of the ATLAS detector in the arena of hadronic physics
We can rule out the hypothesis that the knee in the cosmic ray spectrum is due to the presence of some strong indication of new hadronic physics threshold, where some 20% of the cosmic ray primary energy would need to be transferred to invisible channels
Current models of hadronic interactions are broadly descriptive of the observed ATLAS hadronic physics program data
Summary
Over the past ten years or so ATLAS has been involved in developing the detector coverage in the forward direction in order to expand the physics horizons of the ATLAS detector in the arena of hadronic physics. In section two we will present the latest results in the ATLAS study of the p-p total, inelastic and elastic cross-section and in section three the latest p-p charged particle distributions. In section four we will briefly consider some implications of ATLAS hadronic physics results for of high energy cosmic ray physics. In section five, we will touch on the possible use of the ATLAS detector as an underground cosmic muon observatory
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