Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/12576
Title: Reconstruction and Identification of Pairs of Collimated τ-Leptons Decaying Hadronically Using S=13 TeV pp Collision Data With the ATLAS Detector
Authors: Zwalinski, L.
Zou, W.
Zormpa, O.
Zorbas, T.G.
Zoch, K.
Zoccoli, A.
Monzani, S.
Publisher: Springer Nature
Abstract: This paper describes an algorithm for reconstructing and identifying a highly collimated hadronically decaying τ-lepton pair with low transverse momentum. When two τ-leptons are highly collimated, their visible decay products might overlap, degrading the reconstruction performance for each of the τ-leptons. A dedicated treatment attempting to tag the τ-lepton pair as a single object is required. The reconstruction algorithm is based on a large radius jet and its associated two leading subjets, and the identification uses a boosted decision tree to discriminate between signatures from τ+τ- systems and those arising from QCD jets. The efficiency of the identification algorithm is measured in Zγ events using proton–proton collision data at s=13 TeV collected by the ATLAS experiment at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139fb-1. The resulting data-to-simulation scale factors are close to unity with uncertainties ranging from 26 to 37%. © The Author(s) 2025.
URI: https://doi.org/10.1140/epjc/s10052-025-14075-3
https://hdl.handle.net/20.500.11851/12576
ISSN: 1434-6044
Appears in Collections:Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

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