TY  - JOUR
AU  - ATLAS Collaboration (Aad, G. et al
AU  - Aikot, A.
AU  - Amos, K. R.
AU  - Aparisi Pozo, J. A.
AU  - Bailey, A. J.
AU  - Bouchhar, N.
AU  - Cabrera Urban, S.
AU  - Cantero, J.
AU  - Cardillo, F.
AU  - Castillo Gimenez, V.
AU  - Chitishvili, M.
AU  - Costa, M. J.
AU  - Didenko, M.
AU  - Escobar, C.
AU  - Fiorini, L.
AU  - Fullana Torregrosa, E.
AU  - Fuster, J.
AU  - Garcia, C.
AU  - Garcia Navarro, J. E.
AU  - Gomez Delegido, A. J.
AU  - Gonzalez de la Hoz, S.
AU  - Gonzalvo Rodriguez, G. R.
AU  - Guerrero Rojas, J. G. R.
AU  - Lacasta, C.
AU  - Marti-Garcia, S.
AU  - Martinez Agullo, P.
AU  - Miralles Lopez, M.
AU  - Mitsou, V. A.
AU  - Monsonis Romero, L.
AU  - Moreno Llacer, M.
AU  - Munoz Perez, D.
AU  - Navarro-Gonzalez, J.
AU  - Poveda, J.
AU  - Prades Ibañez, A.
AU  - Rubio Jimenez, A.
AU  - Ruiz-Martinez, A.
AU  - Sabatini, P.
AU  - Saibel, A.
AU  - Salt, J.
AU  - Sanchez Sebastian, V.
AU  - Sayago Galvan, I.
AU  - Senthilkumar, V.
AU  - Soldevila, U.
AU  - Sanchez, J.
AU  - Torro Pastor, E.
AU  - Valero, A.
AU  - Valiente Moreno, E.
AU  - Valls Ferrer, J. A.
AU  - Varriale, L.
AU  - Villaplana Perez, M.
AU  - Vos, M.
PY  - 2024
DA  - 2024//
TI  - Improving topological cluster reconstruction using calorimeter cell timing in ATLAS
T2  - Eur. Phys. J. C
JO  - European Physical Journal C
SP  - 455 - 42pp
VL  - 84
IS  - 5
PB  - Springer
AB  - 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 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.
SN  - 1434-6044
UR  - https://arxiv.org/abs/2310.16497
UR  - https://doi.org/10.1140/epjc/s10052-024-12657-1
DO  - 10.1140/epjc/s10052-024-12657-1
LA  - English
N1  - WOS:001281877300001
ID  - ATLASCollaborationAad_etal2024
ER  -