Impact of a new Cherenkov light parameterisation on the reconstruction   of shower profiles from Auger hybrid data
  The light signal measured by fluorescence telescopes receives - strongly depending on the shower geometry with respect to the detector - a non-negligible contribution from additionally produced Cherenkov light. This Cherenkov contribution has to be accounted for to determine primary parameters properly. In comparison to the previous ansatz used by other experiments, the impact of a new analytical description of Cherenkov light production in EAS on the Auger event reconstruction is investigated. 
F. Nerling (a), J. Bluemer (a, b), R. Engel (a), M. Unger (a) (for the   Pierre Auger Collaboration (c)) ((a) Forschungszent...