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2017-03-10 Anatoli Fedynitch

Atmospheric leptons are of continuous interest for several scientific communities. They

constitute a part of secondary particles emerging from giant particle cascades initiated by cosmic

rays impinging on the atmosphere at high altitudes, called extensive air showers. The interest comes

mainly due to two factors: the span of available energies ranging from MeV to multi-PeV and the

permanent particle beam at no cost. A striking limitation for experiments, which study fundamental

physics indirectly with atmospheric neutrinos, is the precision to which expected fluxes can be

predicted. Dominating uncertainties originate from not well understood forward hadronic interactions

and the flux of cosmic rays. I will show highlights of recent results and the progress on the estimation

of the flux uncertainties, where our novel combined fit to cosmic ray data allows us to get one of the

dominant theoretical uncertainties under control.

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