Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/3618
Title: Measurements of b-jet tagging efficiency with the ATLAS detector using tt¯ events at ?s=13 TeV
Authors: The ATLAS Collaboration
Sultansoy, Saleh
Keywords: Collisions
jets
proton–proton collisions
Issue Date: Aug-2018
Publisher: Springer Verlag
Source: ATLAS collaboration. (2018). Measurements of b-jet tagging efficiency with the ATLAS detector using $$ t\overline {t} $$ events at s= 13$$\sqrt {s}= 13$$ TeV. Journal of High Energy Physics, 2018(8), 89.
Abstract: The efficiency to identify jets containing b-hadrons (b-jets) is measured using a high purity sample of dileptonic top quark-antiquark pairs (tt¯) selected from the 36.1 fb?1 of 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 s=13 TeV. Two methods are used to extract the efficiency from tt¯ events, a combinatorial likelihood approach and a tag-and-probe method. A boosted decision tree, not using b-tagging information, is used to select events in which two b-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. © 2018, The Author(s).
URI: https://link.springer.com/article/10.1007%2FJHEP08%282018%29089
https://hdl.handle.net/20.500.11851/3618
ISSN: 11266708
Appears in Collections:Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü / Department of Material Science & Nanotechnology Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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