Jet Energy Corrections

HIP has made leading contributions to the CMS jet energy corrections through coordination of the overall effort and through evaluation of the systematics and their correlations (Mikko Voutilainen, Juska Pekkanen). The last set of corrections and uncertainties for the re-reconstructed 8 TeV data was completed in October 2013, and reached a record low uncertainty of 0.6%. An important part of this success was the re-factorization done on the pile-up and jet flavor systematics to reduce double-counting between subcorrections.