Medium-induced coherent gluon radiation at collider and cosmic ray energies*

In high energy proton-nucleus collisions, hadron production is significantly affected by induced fully coherent gluon radiation. This energy loss mechanism stems from an interference between initial and final state color configurations for the underlying partonic subprocess. Quenching of heavy and light mesons due solely to this effect is important at LHC energies and quantitatively (at least) on par with expected suppression from nuclear modifications to parton distribution functions. As a further application, we study collisions of cosmic rays with light nuclei in the Earth's atmosphere and find a sizeable reduction in the corresponding neutrino flux induced by semileptonic decays.