DOE OSTI · 3376140
Estimation of backgrounds from jets misidentified as τ-leptons using the Universal Fake Factor method with the ATLAS detector
Abstract
Processes with τ$$\tau $$-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$$\tau $$-leptons produced in proton–proton collisions only through their decay products. Data analyses involving hadronically decaying τ$$\tau $$-leptons face challenges due to backgrounds from jets misidentified as τ$$\tau $$-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$$\tau $$-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)$$W(\mu u )$$ enriched event sample, ranges from 15 to 35% depending on the τ$$\tau $$-lepton’s transverse momentum and charged-particle decay multiplicity.
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Aad, G, Aakvaag, E, Abbott, B, Abdelhameed, S, Abeling, K, Abicht, N J, Abidi, S H, Aboelela, M, Aboulhorma, A, Abramowicz, H, Abulaiti, Y, Acharya, B S, Ackermann, A, Bourdarios, C Adam, Adamczyk, L, Addepalli, S V, Addison, M J, Adelman, J, Adiguzel, A, Adye, T, Affolder, A A, Afik, Y, Agaras, M N, Aggarwal, A, Agheorghiesei, C, Ahmadov, F, Ahuja, S, Ai, X, Aielli, G, Aikot, A, Tamlihat, M Ait, Aitbenchikh, B, Akbiyik, M, Åkesson, T P A, Akimov, A V, Akiyama, D, Akolkar, N N, Aktas, S, Alberghi, G L, Albert, J, Albicocco, P, Albouy, G L, Alderweireldt, S, Alegria, Z L, Aleksa, M, Aleksandrov, I N, Alexa, C, Alexopoulos, T, Alfonsi, F, Algren, M, Alhroob, M, Ali, B, Ali, H M J, Ali, S, Alibocus, S W, Aliev, M, Alimonti, G, Alkakhi, W, Allaire, C, Allbrooke, B M M, Allen, J S, Allen, J F, Allport, P P, Aloisio, A, Alonso, F, Alpigiani, C, Alsolami, Z M K, Fernandez, A Alvarez, Cardoso, M Alves, Alviggi, M G, Aly, M, Coutinho, Y Amaral, Ambler, A, Amelung, C, Amerl, M, Ames, C G, Amidei, D, Amini, B, Amirie, K, Amirkhanov, A, Dos Santos, S P Amor, Amos, K R, Amperiadou, D, An, S, Ananiev, V, Anastopoulos, C, Andeen, T, Anders, J K, Anderson, A C, Andreazza, A, Angelidakis, S, Angerami, A, Anisenkov, A V, Annovi, A, Antel, C, Antipov, E, Antonelli, M, Anulli, F, Aoki, M, Aoki, T. 2025-01-01. Estimation of backgrounds from jets misidentified as τ-leptons using the Universal Fake Factor method with the ATLAS detector. https://doi.org/10.1140/epjc%2Fs10052-025-14916-1
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