Jet corrections at CMS will initially be derived from simulation tuned on test beam data, determined directly from collision data when available, and ultimately from a simulation tuned on collision data. The corrections will be factorized into a fixed sequence of sub-corrections associated with different detector and physics effects. The following three factors are minimum requirements for most analysis: offset corrections for pile-up and noise; correction for the response of the calorimeter as a function of jet pseudorapidity relative to the barrel; and correction for the absolute response as a function of transverse momentum in the barrel. The required correction gives a jet Lorentz vector equivalent to the sum of particles in the jet cone emanating from a QCD hard collision. The following additional factors will be provided for use if desired by the analysis: dependence on the fraction of jet energy in the electromagnetic calorimeter; dependence on the flavor of the final state jet; removal of underlying event energy; and correction back to the parton level. We discuss the current status of these corrections, the planned data-driven techniques for their derivation, and their anticipated evolution with the stages of the CMS experiment Show more
Journal / seriesCMS Physics Analysis Summaries
Pages / Article No.
Organisational unit03593 - Dissertori, Günther
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