ATLAS b-jet identification performance and efficiency measurement with $$t{\bar{t}}$$ events in pp collisions at $$\sqrt{s}=13$$ TeV
- G. Aad
- B. Abbott
- D. C. Abbott
- A. Abed Abud
- K. Abeling
- D. K. Abhayasinghe
- S. H. Abidi
- O. S. AbouZeid
- N. L. Abraham
- H. Abramowicz
- H. Abreu
- Y. Abulaiti
- B. S. Acharya
- B. Achkar
- S. Adachi
- L. Adámek
- C. Adam Bourdarios
- L. Adamczyk
- L. Adámek
- J. Adelman
- M. Adersberger
- A. Adıgüzel
- S. Adorni
- T. Adye
- A. A. Affolder
- Y. Afik
- C. Agapopoulou
- M. N. Agaras
- A. Aggarwal
- C. Agheorghiesei
- J. A. Aguilar–Saavedra
- F. Ahmadov
- W. S. Ahmed
- X. Ai
- G. Aielli
- S. Akatsuka
- T. P. A. Åkesson
- E. Akilli
- A. V. Akimov
- K. Al Khoury
- G. L. Alberghi
- Justin E Albert
- M. J. Alconada Verzini
- S. Alderweireldt
- M. Aleksa
- I. N. Aleksandrov
- C. Alexa
- D. Alexandre
- T. Alexopoulos
- A. Alfonsi
- M. Alhroob
- B. Ali
- G. Alimonti
- J. Alison
- S. P. Alkire
- C. Allaire
- B. M. M. Allbrooke
- B. W. Allen
- P. P. Allport
- A. Aloisio
- A. Alonso
- F. Alonso
- C. Alpigiani
- A. A. Alshehri
- M. Alvarez Estevez
- D. Álvarez Piqueras
- M. G. Alviggi
- Y. Amaral Coutinho
- A. Ambler
- L. Ambroz
- C. Amelung
- D. Amidei
- S. P. Amor Dos Santos
- S. Amoroso
- C. S. Amrouche
- F. F. An
- C. Anastopoulos
- N. Andari
- T. Andeen
- C. F. Anders
- J. K. Anders
- Attilio Andreazza
- V. Andrei
- C. R. Anelli
- S. Angelidakis
- Aaron Angerami
- A. V. Anisenkov
- A. Annovi
- C. Antel
- M. T. Anthony
- M. Antonelli
- D. J. A. Antrim
- F. Anulli
- M. Aoki
- J. A. Aparisi Pozo
- L. Aperio Bella
- G. Arabidze
- J. P. Araque
- V. Araujo Ferraz
- R. Araujo Pereira
- EHElias Sideras Haddad
The European Physical Journal C · 2019 · Springer Science+Business Media
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Abstract
Abstract The algorithms used by the ATLAS Collaboration during Run 2 of the Large Hadron Collider to identify jets containing b -hadrons are presented. The performance of the algorithms is evaluated in the simulation and the efficiency with which these algorithms identify jets containing b -hadrons is measured in collision data. The measurement uses a likelihood-based method in a sample highly enriched in $$t{\bar{t}}$$ t t ¯ events. The topology of the $$t \rightarrow W b$$ t → W b decays is exploited to simultaneously measure both the jet flavour composition of the sample and the efficiency in a transverse momentum range from 20 to 600 GeV. The efficiency measurement is subsequently compared with that predicted by the simulation. The data used in this measurement, corresponding to a total integrated luminosity of 80.5 $$\hbox {fb}^{-1}$$ fb - 1 , were collected in proton–proton collisions during the years 2015–2017 at a centre-of-mass energy $$\sqrt{s}=$$ s = 13 TeV. By simultaneously extracting both the efficiency and jet flavour composition, this measurement significantly improves the precision compared to previous results, with uncertainties ranging from 1 to 8% depending on the jet transverse momentum.