Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment

In the pp → tt ̄ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produce...

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Detalles Bibliográficos
Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Monticelli, Fernando Gabriel, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Exactas
Física
charge asymmetry
highly boosted top-quark pair production
pp collision data
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/77618
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-77618
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
charge asymmetry
highly boosted top-quark pair production
pp collision data
spellingShingle Ciencias Exactas
Física
charge asymmetry
highly boosted top-quark pair production
pp collision data
Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment
topic_facet Ciencias Exactas
Física
charge asymmetry
highly boosted top-quark pair production
pp collision data
description In the pp → tt ̄ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produced with a large invariant mass. The analysis is performed on 20.3 fb−1 of pp collision data at √s = 8 TeV collected by the ATLAS experiment at the LHC, using reconstruction techniques specifically designed for the decay topology of highly boosted top quarks. The charge asymmetry in a fiducial region with large invariant mass of the top-quark pair (mtt ̄ > 0.75 TeV) and an absolute rapidity difference of the top and anti-top quark candidates within −2 < |yt| − |yt ̄| < 2 is measured to be 4.2 ± 3.2%, in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three tt ̄ mass bins is also presented.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
title Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment
title_short Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment
title_full Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment
title_fullStr Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment
title_full_unstemmed Measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 TeV pp collision data collected by the ATLAS experiment
title_sort measurement of the charge asymmetry in highly boosted top-quark pair production in √s = 8 tev pp collision data collected by the atlas experiment
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/77618
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AT arduhfranciscoanuar measurementofthechargeasymmetryinhighlyboostedtopquarkpairproductionins8tevppcollisiondatacollectedbytheatlasexperiment
AT dovamariateresa measurementofthechargeasymmetryinhighlyboostedtopquarkpairproductionins8tevppcollisiondatacollectedbytheatlasexperiment
AT monticellifernandogabriel measurementofthechargeasymmetryinhighlyboostedtopquarkpairproductionins8tevppcollisiondatacollectedbytheatlasexperiment
AT wahlberghernanpablo measurementofthechargeasymmetryinhighlyboostedtopquarkpairproductionins8tevppcollisiondatacollectedbytheatlasexperiment
AT theatlascollaboration measurementofthechargeasymmetryinhighlyboostedtopquarkpairproductionins8tevppcollisiondatacollectedbytheatlasexperiment
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