Distributions of the LCW-scale per-event median pT density ρ (based on topological clusters with |η| < 2) for four representative values of the reconstructed primary vertex multiplicity NPV. Events with the same number of vertices may have widely varying levels of pile-up activity in the calorimeter, as measured by ρ. The use of ρ instead of NPV in the pile-up correction therefore results in significantly reduced fluctuations, or improved energy resolution. | [eps] |
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