Measurements of b-jet tagging efficiency with the ATLAS detector using t(t)over-bar events at root s=13 TeV uri icon

abstract

  • AbstractThe efficiency to identify jets containingb-hadrons (b-jets) is measured using a high purity sample of dileptonic top quark-antiquark pairs ($$ toverline{t} $$tt) selected from the 36.1 fb1of data collected by the ATLAS detector in 2015 and 2016 from proton-proton collisions produced by the Large Hadron Collider at a centre-of-mass energy$$ sqrt{s}=13 $$s=13TeV. Two methods are used to extract the efficiency from$$ toverline{t} $$ttevents, a combinatorial likelihood approach and a tag-and-probe method. A boosted decision tree, not usingb-tagging information, is used to select events in which twob-jets are present, which reduces the dominant uncertainty in the modelling of the flavour of the jets. The efficiency is extracted for jets in a transverse momentum range from 20 to 300 GeV, with data-to-simulation scale factors calculated by comparing the efficiency measured using collision data to that predicted by the simulation. The two methods give compatible results, and achieve a similar level of precision, measuring data-to-simulation scale factors close to unity with uncertainties ranging from 2% to 12% depending on the jet transverse momentum.

altmetric score

  • 1.25

author list (cited authors)

  • Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abhayasinghe, D. K., ... Zwalinski, L.

citation count

  • 51

complete list of authors

  • Aaboud, M||Aad, G||Abbott, B||Abdinov, O||Abeloos, B||Abhayasinghe, DK||Abidi, SH||AbouZeid, OS||Abraham, NL||Abramowicz, H||Abreu, H||Abulaiti, Y||Acharya, BS||Adachi, S||Adamczyk, L||Adelman, J||Adersberger, M||Adiguzel, A||Adye, T||Affolder, AA||Afik, Y||Agheorghiesei, C||Aguilar-Saavedra, JA||Ahmadov, F||Aielli, G||Akatsuka, S||Åkesson, TPA||Akilli, E||Akimov, AV||Alberghi, GL||Albert, J||Albicocco, P||Alconada Verzini, MJ||Alderweireldt, S||Aleksa, M||Aleksandrov, IN||Alexa, C||Alexander, G||Alexopoulos, T||Alhroob, M||Ali, B||Alimonti, G||Alison, J||Alkire, SP||Allaire, C||Allbrooke, BMM||Allen, BW||Allport, PP||Aloisio, A||Alonso, A||Alonso, F||Alpigiani, C||Alshehri, AA||Alstaty, MI||Alvarez Gonzalez, B||Álvarez Piqueras, D||Alviggi, MG||Amadio, BT||Amaral Coutinho, Y||Ambroz, L||Amelung, C||Amidei, D||Amor Dos Santos, SP||Amoroso, S||Amrouche, CS||Anastopoulos, C||Ancu, LS||Andari, N||Andeen, T||Anders, CF||Anders, JK||Anderson, KJ||Andreazza, A||Andrei, V||Anelli, CR||Angelidakis, S||Angelozzi, I|