Please use this identifier to cite or link to this item:
https://hdl.handle.net/20.500.11851/11773
Title: | Improving Topological Cluster Reconstruction Using Calorimeter Cell Timing in Atlas | Authors: | Zwalinski, L. Zou, W. Zormpa, O. Zorbas, T.G. Zoch, K. Zoccoli, A. Živković, L. |
Keywords: | Calorimeters Calorimetry Germanium compounds Hadrons Photons ATLAS experiment Bunch crossings Calorimeter cells Cell clustering Hadronics Noise ratio Pile-ups Signal to noise Signals reconstruction Topo Topology |
Publisher: | Springer Nature | Abstract: | Clusters of topologically connected calorimeter cells around cells with large absolute signal-to-noise ratio (topo-clusters) are the basis for calorimeter signal reconstruction in the ATLAS experiment. Topological cell clustering has proven performant in LHC Runs 1 and 2. It is, however, susceptible to out-of-time pile-up of signals from soft collisions outside the 25 ns proton-bunch-crossing window associated with the event’s hard collision. To reduce this effect, a calorimeter-cell timing criterion was added to the signal-to-noise ratio requirement in the clustering algorithm. Multiple versions of this criterion were tested by reconstructing hadronic signals in simulated events and Run 2 ATLAS data. The preferred version is found to reduce the out-of-time pile-up jet multiplicity by ∼50% for jet pT∼20 GeV and by ∼80% for jet pT≳50 GeV, while not disrupting the reconstruction of hadronic signals of interest, and improving the jet energy resolution by up to 5% for 20<pT<30 GeV. Pile-up is also suppressed for other physics objects based on topo-clusters (electrons, photons, τ-leptons), reducing the overall event size on disk by about 6% in early Run 3 pile-up conditions. Offline reconstruction for Run 3 includes the timing requirement. © The Author(s) 2024. | URI: | https://doi.org/10.1140/epjc/s10052-024-12657-1 https://hdl.handle.net/20.500.11851/11773 |
ISSN: | 1434-6044 |
Appears in Collections: | Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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