Estimation of backgrounds from jets misidentified as τ-leptons using the Universal Fake Factor method with the ATLAS detector
Processes with τ-leptons in the final state are important for Standard Model measurements and searches for physics beyond the Standard Model. The ATLAS experiment at the Large Hadron Collider observes τ-leptons produced in proton-proton collisions only through their decay products. Data analyses inv...
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| Autores principales: | , , , , , , , , , , , , , , , , , |
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| Autor Corporativo: | |
| Formato: | Article (Journal) |
| Lenguaje: | inglés |
| Publicado: |
19 December 2025
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| In: |
The European physical journal. C, Particles and fields
Year: 2025, Volumen: 85, Número: 12, Pages: 1-36 |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-025-14916-1 |
| Acceso en línea: | Verlag, kostenfrei, Volltext: https://doi.org/10.1140/epjc/s10052-025-14916-1
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| Notas de Autor: | ATLAS Collaboration |
| Sumario: | Processes with τ-leptons in the final state are important for Standard Model measurements and searches for physics beyond the Standard Model. The ATLAS experiment at the Large Hadron Collider observes τ-leptons produced in proton-proton collisions only through their decay products. Data analyses involving hadronically decaying τ-leptons face challenges due to backgrounds from jets misidentified as τ-leptons that are not modelled reliably by Monte Carlo simulations. Data-driven methods such as the fake-factor method allow such misidentified backgrounds to be predicted by measuring transfer factors, known as fake factors, in data from dedicated regions. This paper describes a refined technique for determining the fake factors, the Universal Fake Factor method. It evaluates the fake factors for a signal region by using fake factors from samples enriched in different sources of jets misidentified as τ-leptons (light-quark, gluon, b-quark, and pile-up jets). Each fake factor is calculated as a linear combination of fake factors measured in these different enriched samples. For the full Run 2 data set, the systematic uncertainty of the calculated fake factors, evaluated using W(μν) enriched event sample, ranges from 15 to 35% depending on the τ-lepton’s transverse momentum and charged-particle decay multiplicity. |
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| Notas: | ATLAS Collaboration: G. Aad, A. Ackermann, M.J. Backes, L.M. Baltes, F. Bartels, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrtchyan, L. Sanfilippo, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, L. Vigani, M. Wessels, J. Zinsser [und viele weitere] Gesehen am 22.06.2026 |
| Descripción Física: | Online Resource |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-025-14916-1 |