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Cosmic rays with energies up to $10^{11}\,\mathrm{GeV}$ enter the atmosphereand produce showers of secondary particles. Inside these showers muons withhigh transverse momentum ($p_\mathrm{T} \gtrsim 2\,\mathrm{GeV}$) are producedfrom the decay of heavy hadrons, or from high $p_\mathrm{T}$ pions and kaonsvery early in the shower development. These isolated muons can have largetransverse separations from the shower core up to several hundred meters,together with the muon bundle forming a double or triple track signature inIceCube. The separation from the core is a measure of the transverse momentumof the muon's parent particle. Assuming the validity of perturbative quantumchromodynamics (pQCD) the muon lateral distribution depends on the compositionof the incident nuclei, thus the composition of high energy cosmic rays can bedetermined from muon separation measurements. Vice versa these muons can helpto understand uncertainties due to phenomenological models as well as test pQCDpredictions of high energy interactions involving heavy nuclei. Afterintroducing the physics scenario of high $p_\mathrm{T}$ muons inkilometer-scale neutrino telescopes we will review results from IceCube in its59-string configuration as starting point and discuss recent studies oncomposition using laterally separated muons in the final detectorconfiguration.

Composition from high $p_\mathrm{T}$ muons in IceCube