Reconstruction and identification of pairs of collimated $τ$-leptons decaying hadronically using $\sqrt{s}=13$ TeV $pp$ collision data with the ATLAS detector
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866908381726375936 |
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| author | ATLAS Collaboration |
| author_facet | ATLAS Collaboration |
| contents | 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. This requires a dedicated treatment that attempts to tag it as a single object. 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 $\sqrt{s}=13$ TeV collected by the ATLAS experiment at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 $\mbox{fb}^{-1}$. The resulting data-to-simulation scale factors are close to unity with uncertainties ranging from 26% to 37%. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_09357 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Reconstruction and identification of pairs of collimated $τ$-leptons decaying hadronically using $\sqrt{s}=13$ TeV $pp$ collision data with the ATLAS detector ATLAS Collaboration High Energy Physics - Experiment 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. This requires a dedicated treatment that attempts to tag it as a single object. 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 $\sqrt{s}=13$ TeV collected by the ATLAS experiment at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 $\mbox{fb}^{-1}$. The resulting data-to-simulation scale factors are close to unity with uncertainties ranging from 26% to 37%. |
| title | Reconstruction and identification of pairs of collimated $τ$-leptons decaying hadronically using $\sqrt{s}=13$ TeV $pp$ collision data with the ATLAS detector |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2411.09357 |