TY  - SER
AU  - Aad,G.
AU  - Abbott,B.
AU  - Chelkov,G.A.
AU  - Khodinov,A.
AU  - Parida,B.
AU  - Tsybychev,D.
AU  - Vaniachine,A.
AU  - Aaboud,M.
TI  - Measurements of b-jet tagging efficiency with the ATLAS detector using tt¯ events at √s=13 TeV
KW  - ATLAS, детектор
KW  - Большой адронный коллайдер
KW  - протон-протонные столкновения
KW  - статьи в журналах
N1  - Библиогр.: 50 назв
N2  - 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
UR  - http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000660740
ER  -