Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13; 8; 7 TeV with the ATLAS detector

Ratios of top-quark pair to Z-boson cross sections measured from proton-proton collisions at the LHC centre-of-mass energies of √s = 13TeV, 8TeV, and 7TeV are presented by the ATLAS Collaboration. Single ratios, at a given √s for the two processes and at different √s for each process, as well as dou...

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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:Inglés
Publicado: 2017
Materias:
Ciencias Exactas
Física
z boson
top quark
hadron-hadron scattering
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82082
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82082
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
z boson
top quark
hadron-hadron scattering
spellingShingle Ciencias Exactas
Física
z boson
top quark
hadron-hadron scattering
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 top-quark pair to Z-boson cross-section ratios at √s = 13; 8; 7 TeV with the ATLAS detector
topic_facet Ciencias Exactas
Física
z boson
top quark
hadron-hadron scattering
description Ratios of top-quark pair to Z-boson cross sections measured from proton-proton collisions at the LHC centre-of-mass energies of √s = 13TeV, 8TeV, and 7TeV are presented by the ATLAS Collaboration. Single ratios, at a given √s for the two processes and at different √s for each process, as well as double ratios of the two processes at different √s, are evaluated. The ratios are constructed using previously published ATLAS measurements of the t¯t and Z-boson production cross sections, corrected to a common phase space where required, and a new analysis of Z → ℓ+ℓ- where ℓ = e,μ at √s = 13TeV performed with data collected in 2015 with an integrated luminosity of 3.2 fb-1. Correlations of systematic uncertainties are taken into account when evaluating the uncertainties in the ratios. The correlation model is also used to evaluate the combined cross section of the Z → e+e- and the Z → μ+μ- channels for each √s value. The results are compared to calculations performed at next-to-next-to-leading-order accuracy using recent sets of parton distribution functions. The data demonstrate signi cant power to constrain the gluon distribution function for the Bjorken-x values near 0.1 and the lightquark sea for x < 0.02
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 top-quark pair to Z-boson cross-section ratios at √s = 13; 8; 7 TeV with the ATLAS detector
title_short Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13; 8; 7 TeV with the ATLAS detector
title_full Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13; 8; 7 TeV with the ATLAS detector
title_fullStr Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13; 8; 7 TeV with the ATLAS detector
title_full_unstemmed Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13; 8; 7 TeV with the ATLAS detector
title_sort measurements of top-quark pair to z-boson cross-section ratios at √s = 13; 8; 7 tev with the atlas detector
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/82082
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