Measurements of b-jet tagging efficiency with the ATLAS detector using tt¯ events at √s=13 TeV

doi:10.1007/JHEP08(2018)089

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DOI Доступ к ресурсу на сайте издателя				10.1007/JHEP08(2018)089

Title: Measurements of b-jet tagging efficiency with the ATLAS detector using tt¯ events at √s=13 TeV
Creator: Aad, G.
Creator: Abbott, B.
Creator: Chelkov, G. A.
Creator: Khodinov, A.
Creator: Parida, B.
Creator: Tsybychev, D.
Creator: Vaniachine, A.
Creator: Aaboud, M.
Subject: ATLAS, детектор
Большой адронный коллайдер
протон-протонные столкновения
Date: 2018
DOI: 10.1007/JHEP08(2018)089
Description: 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.

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Identifier: vtls:000660740
http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000660740
Type: статьи в журналах
Source: Journal of high energy physics. 2018. № 8. P. 089 (1-46)
Language: eng

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Физический факультет Measurements of b-jet tagging efficiency with the ATLAS detector using tt¯ events at √s=13 TeV