Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 80: Calorimeters
T 80.9: Talk
Thursday, April 2, 2020, 18:35–18:50, H-1.003
New developments on the residual pile-up subtraction for small R jets in ATLAS — •Pablo Rivadeneira1, Michaela Queitsch-Maitland2, and Krisztian Peters1 for the ATLAS collaboration — 1DESY Hamburg — 2CERN
In-time and out-of-time pile-up produce energy deposits in the calorimeters generating a dependence of the reconstructed transverse momentum (pT) of jets on the pile-up. In order to correct for this dependence in the ATLAS calibration workflow, first, a correction based on the area of the jet is applied and later a residual correction is needed. The residual calibrations uses the number of primary vertex (NPV) as an estimator of in-time and the mean number of interactions per bunch crossing (mu) as an estimator of out-of-time pile-up. This correction has the limitation that it does not consider any correlation between mu and NPV. Also, the dependence on the pile-up is dependent on the jet pT. This dependence on the pT is set as an uncertainty. A new method that removes the pile-up dependence considering the correlation between mu and NPV, and the dependence on the pT of the jet has been developed and will be part of the new recommendations provided by the JET/ETMiss group to the ATLAS collaboration.