Measurements of <i>b</i>-jet tagging efficiency with the ATLAS detector using <i>t¯t</i> events at √s = 13 TeV

The efficiency to identify jets containing <i>b</i>-hadrons (<i>b</i>-jets) is measured using a high purity sample of dileptonic top quark-antiquark pairs (<i>t¯t</i>) selected from the 36.1 fb<sup>-1</sup> of data collected by the ATLAS detector in 20...

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Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Español
Publicado: 2018
Materias:
Ciencias Exactas
Física
hadron-hadron scattering
Medición
ATLAS detector
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/79372
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-79372
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Ciencias Exactas
Física
hadron-hadron scattering
Medición
ATLAS detector
spellingShingle Ciencias Exactas
Física
hadron-hadron scattering
Medición
ATLAS detector
Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Measurements of <i>b</i>-jet tagging efficiency with the ATLAS detector using <i>t¯t</i> events at √s = 13 TeV
topic_facet Ciencias Exactas
Física
hadron-hadron scattering
Medición
ATLAS detector
description The efficiency to identify jets containing <i>b</i>-hadrons (<i>b</i>-jets) is measured using a high purity sample of dileptonic top quark-antiquark pairs (<i>t¯t</i>) selected from the 36.1 fb<sup>-1</sup> 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 = 13TeV. Two methods are used to extract the efficiency from <i>t¯t</i> events, a combinatorial likelihood approach and a tag-and-probe method. A boosted decision tree, not using <i>b</i>-tagging information, is used to select events in which two <i>b</i>-jets are present, which reduces the dominant uncertainty in the modelling of the avour 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.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
title Measurements of <i>b</i>-jet tagging efficiency with the ATLAS detector using <i>t¯t</i> events at √s = 13 TeV
title_short Measurements of <i>b</i>-jet tagging efficiency with the ATLAS detector using <i>t¯t</i> events at √s = 13 TeV
title_full Measurements of <i>b</i>-jet tagging efficiency with the ATLAS detector using <i>t¯t</i> events at √s = 13 TeV
title_fullStr Measurements of <i>b</i>-jet tagging efficiency with the ATLAS detector using <i>t¯t</i> events at √s = 13 TeV
title_full_unstemmed Measurements of <i>b</i>-jet tagging efficiency with the ATLAS detector using <i>t¯t</i> events at √s = 13 TeV
title_sort measurements of <i>b</i>-jet tagging efficiency with the atlas detector using <i>t¯t</i> events at √s = 13 tev
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/79372
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