Abstract
Muons and neutrinos from cosmic ray interactions in the atmosphere originate from decays of mesons in air-showers. Sibyll-2.3c aims to give a precise description of hadronic interactions in the relevant phase space for conventional and prompt leptons in light of new accelerator data, including that from the LHC. Sibyll is designed primarily as an event generator for use in simulation of extensive air showers. Because it has been tuned for forward physics as well as the central region, it can also be used to calculate inclusive fluxes. The purpose of this paper is to describe the use of Sibyll-2.3c for calculation of fluxes of atmospheric leptons.
Highlights
The main theme of this paper is the connection between hadronic interactions at high energies and the inclusive spectra of atmospheric leptons
VI we summarize the impact of SIBYLL-2.3c on inclusive lepton spectra
Biasing techniques can reduce this inefficiency that is related to the absorption of mesons in the atmosphere, no such technique is available at present to bias hadronic interaction models for the generation of mesons carrying a large fraction of the projectiles momentum
Summary
The main theme of this paper is the connection between hadronic interactions at high energies and the inclusive spectra of atmospheric leptons. The coupled transport equations that relate the lepton spectra to the primary cosmic-ray spectrum depend on the properties of the hadronic interactions, implemented here with SIBYLL-2.3c. A key observation is that, because of the steep primary cosmic-ray spectrum, it is the forward fragmentation region of hadronic interactions that is of special importance for inclusive lepton spectra. In the second part of the paper (Sec. V) we describe how SIBYLL-2.3c deals with the forward fragmentation region including production of charm. As far as possible, to relate observed differences to specific features of hadronic interactions with the idea that precise measurements of atmospheric lepton spectra have the potential to constrain features of forward production of hadrons at high energy
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