Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector

This paper presents a measurement of the top quark pair (t¯t) production charge asymmetry AC using 4.7 fb−1 of proton-proton collisions at a centre-of-mass energy √s = 7 TeV collected by the ATLAS detector at the LHC. A t¯t-enriched sample of events with a single lepton (electron or muon), missing t...

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Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Tripiana, Martín Fernando, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Exactas
Física
hadron-hadron scattering
top physics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/78944
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-78944
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
hadron-hadron scattering
top physics
spellingShingle Ciencias Exactas
Física
hadron-hadron scattering
top physics
Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
topic_facet Ciencias Exactas
Física
hadron-hadron scattering
top physics
description This paper presents a measurement of the top quark pair (t¯t) production charge asymmetry AC using 4.7 fb−1 of proton-proton collisions at a centre-of-mass energy √s = 7 TeV collected by the ATLAS detector at the LHC. A t¯t-enriched sample of events with a single lepton (electron or muon), missing transverse momentum and at least four high transverse momentum jets, of which at least one is tagged as coming from a b-quark, is selected. A likelihood fit is used to reconstruct the t¯t event kinematics. A Bayesian unfolding procedure is employed to estimate AC at the parton-level. The measured value of the t¯t production charge asymmetry is AC = 0.006 ± 0.010, where the uncertainty includes both the statistical and the systematic components. Differential AC measurements as a function of the invariant mass, the rapidity and the transverse momentum of the t¯t- system are also presented. In addition, AC is measured for a subset of events with large t¯t velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
title Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_short Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_full Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_fullStr Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_full_unstemmed Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
title_sort measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 tev using the atlas detector
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/78944
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AT alonsofrancisco measurementofthetopquarkpairproductionchargeasymmetryinprotonprotoncollisionsats7tevusingtheatlasdetector
AT anduagaxabiersebastian measurementofthetopquarkpairproductionchargeasymmetryinprotonprotoncollisionsats7tevusingtheatlasdetector
AT dovamariateresa measurementofthetopquarkpairproductionchargeasymmetryinprotonprotoncollisionsats7tevusingtheatlasdetector
AT monticellifernandogabriel measurementofthetopquarkpairproductionchargeasymmetryinprotonprotoncollisionsats7tevusingtheatlasdetector
AT tripianamartinfernando measurementofthetopquarkpairproductionchargeasymmetryinprotonprotoncollisionsats7tevusingtheatlasdetector
AT theatlascollaboration measurementofthetopquarkpairproductionchargeasymmetryinprotonprotoncollisionsats7tevusingtheatlasdetector
bdutipo_str Repositorios
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