Calibration of the light-flavour jet mistagging efficiency of the b-tagging algorithms with Z+jets events using 139 $\textrm{fb}^{-1}$ of ATLAS proton–proton collision data at $\sqrt{s} = 13$ TeV

• Published in: The European physical journal. C, Particles and fields Vol. 83; no. 8
• Main Authors: Aad, G, Abbott, B, Abbott, D.C, Abeling, K, Abidi, S.H, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Abusleme Hoffman, A.C, Acharya, B.S, Adam Bourdarios, C., Adamczyk, L, Adamek, L, Addepalli, S.V, Adelman, J, Adiguzel, A, Adorni, S, Adye, T, Affolder, A.A, Afik, Y, Agaras, M.N, Agarwala, J, Aggarwal, A, Agheorghiesei, C, Aguilar-Saavedra, J.A, Ahmad, A, Ahmadov, F, Ahmed, W.S, Ahuja, S, Ai, X, Aielli, G, Ait Tamlihat, M., Aitbenchikh, B, Aizenberg, I, Akbiyik, M, Åkesson, T.P. A, Akimov, A.V, Khoury, K.Al, Alberghi, G.L, Albert, J, Albicocco, P, Alderweireldt, S, Aleksa, M, Aleksandrov, I.N, Alexa, C, Alexopoulos, T, Alfonsi, A, Alfonsi, F, Alhroob, M, Ali, B, Ali, S, Aliev, M, Alimonti, G, Alkakhi, W, Allaire, C, Allbrooke, B.M. M, Allendes Flores, C.A, Allport, P.P, Aloisio, A, Alonso, F, Alpigiani, C, Alvarez Estevez, M., Alvarez Fernandez, A., Alviggi, M.G, Aly, M, Amaral Coutinho, Y., Ambler, A, Amelung, C, Amerl, M, Ames, C.G, Amidei, D, Amor dos Santos, S.P, Amos, K.R, Ananiev, V, Anastopoulos, C, Andeen, T, Anders, J.K, Andrean, S.Y, Andreazza, A, Angelidakis, S, Angerami, A, Anisenkov, A.V, Annovi, A, Antel, C, Anthony, M.T, Antipov, E, Antonelli, M, Antrim, D.J. A, Anulli, F, Aoki, M, Aoki, T, Aparisi Pozo, J.A, Aparo, M.A, Aperio Bella, L., Appelt, C, Aranzabal, N, Araujo Ferraz, V., Arcangeletti, C, Arce, A.T. H
• Format: Journal Article
• Language: English
• Published: United States Springer Verlag (Germany) 14.08.2023; Springer Nature
• Subjects: High Energy Physics - Experiment; Physics; muon: pair production; experimental results; jet: associated production; Z0: leptonic decay; particle identification: efficiency; heavy quark; CERN LHC Coll; electron: pair production; particle identification: performance; tracks; Z0: hadroproduction; ATLAS; track data analysis: jet; data analysis method; p p: colliding beams; p p: scattering; calibration; 13000 GeV-cms
• ISSN: 1434-6044; 1434-6052; 1434-6052
• DOI: 10.1140/epjc/s10052-023-11736-z

The identification of b-jets, referred to as b-tagging, is an important part of many physics analyses in the ATLAS experiment at the Large Hadron Collider and an accurate calibration of its performance is essential for high-quality physics results. This publication describes the calibration of the light-flavour jet mistagging efficiency in a data sample of proton–proton collision events at $\sqrt{s}=13$ TeV corresponding to an integrated luminosity of 139 fb$^{-1}$. The calibration is performed in a sample of Z bosons produced in association with jets. Due to the low mistagging efficiency for light-flavour jets, a method which uses modified versions of the b-tagging algorithms referred to as flip taggers is used in this work. A fit to the jet-flavour-sensitive secondary-vertex mass is performed to extract a scale factor from data, to correct the light-flavour jet mistagging efficiency in Monte Carlo simulations, while simultaneously correcting the b-jet efficiency. With this procedure, uncertainties coming from the modeling of jets from heavy-flavour hadrons are considerably lower than in previous calibrations of the mistagging scale factors, where they were dominant. The scale factors obtained in this calibration are consistent with unity within uncertainties.