Reconstruction and identification of pairs of collimated τ-leptons decaying hadronically using s=13 TeV pp collision data with the ATLAS detector
Journal Article
·
· European Physical Journal C
This paper describes an algorithm for reconstructing and identifying a highly collimated hadronically decaying τ$$$$\tau $$$$-lepton pair with low transverse momentum. When two τ$$$$\tau $$$$-leptons are highly collimated, their visible decay products might overlap, degrading the reconstruction performance for each of the τ$$$$\tau $$$$-leptons. A dedicated treatment attempting to tag the τ$$$$\tau $$$$-lepton pair as a single object is required. The reconstruction algorithm is based on a large radius jet and its associated two leading subjets, and the identification uses a boosted decision tree to discriminate between signatures from τ+τ-$$$$\tau ^+\tau ^-$$$$ systems and those arising from QCD jets. The efficiency of the identification algorithm is measured in Zγ$$$$Z\gamma $$$$ events using proton–proton collision data at s=13$$$$\sqrt{s}=13$$$$ TeV collected by the ATLAS experiment at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139fb-1$$$$139\,\text{ fb}^{-1}$$$$. The resulting data-to-simulation scale factors are close to unity with uncertainties ranging from 26 to 37%.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- US Department of Energy; USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 2586417
- Journal Information:
- European Physical Journal C, Journal Name: European Physical Journal C Journal Issue: 5 Vol. 85
- Country of Publication:
- United States
- Language:
- English
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