@Article{ATLASCollaborationAad_etal2024,
author="ATLAS Collaboration (Aad, G. et al
and Aikot, A.
and Amos, K. R.
and Aparisi Pozo, J. A.
and Bailey, A. J.
and Bouchhar, N.
and Cabrera Urban, S.
and Cantero, J.
and Cardillo, F.
and Castillo Gimenez, V.
and Chitishvili, M.
and Costa, M. J.
and Didenko, M.
and Escobar, C.
and Fiorini, L.
and Fullana Torregrosa, E.
and Fuster, J.
and Garcia, C.
and Garcia Navarro, J. E.
and Gomez Delegido, A. J.
and Gonzalez de la Hoz, S.
and Gonzalvo Rodriguez, G. R.
and Guerrero Rojas, J. G. R.
and Lacasta, C.
and Marti-Garcia, S.
and Martinez Agullo, P.
and Miralles Lopez, M.
and Mitsou, V. A.
and Monsonis Romero, L.
and Moreno Llacer, M.
and Munoz Perez, D.
and Navarro-Gonzalez, J.
and Poveda, J.
and Prades Iba{\~{n}}ez, A.
and Rubio Jimenez, A.
and Ruiz-Martinez, A.
and Sabatini, P.
and Saibel, A.
and Salt, J.
and Sanchez Sebastian, V.
and Sayago Galvan, I.
and Senthilkumar, V.
and Soldevila, U.
and Sanchez, J.
and Torro Pastor, E.
and Valero, A.
and Valiente Moreno, E.
and Valls Ferrer, J. A.
and Varriale, L.
and Villaplana Perez, M.
and Vos, M.",
title="Improving topological cluster reconstruction using calorimeter cell timing in ATLAS",
journal="European Physical Journal C",
year="2024",
publisher="Springer",
volume="84",
number="5",
pages="455 - 42pp",
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{\textquoteright}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 similar to 50{\%} for jet p(T) similar to 20 GeV and by similar to 80{\%} for jet p(T) greater than or similar to 50 GeV, while not disrupting the reconstruction of hadronic signals of interest, and improving the jet energy resolution by up to 5{\%} for 20 < p(T) < 30 GeV. Pile-up is also suppressed for other physics objects based on topo-clusters (electrons, photons, tau -leptons), reducing the overall event size on disk by about 6{\%} in early Run 3 pileup conditions. Offline reconstruction for Run 3 includes the timing requirement.",
optnote="WOS:001281877300001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=6266), last updated on Fri, 04 Oct 2024 08:34:49 +0000",
issn="1434-6044",
doi="10.1140/epjc/s10052-024-12657-1",
opturl="https://arxiv.org/abs/2310.16497",
opturl="https://doi.org/10.1140/epjc/s10052-024-12657-1",
language="English"
}