Study of heavy-flavor quarks produced in association with top-quark pairs at √s =7 TeV using the ATLAS detector

Using a sample of dilepton top-quark pair (tt̄) candidate events, a study is performed of the production of top-quark pairs together with heavy-flavor (HF) quarks, the sum of tt̄+b+X and tt̄+c+X, collectively referred to as tt̄+HF. The data set used corresponds to an integrated luminosity of 4.7 fb&...

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Detalles Bibliográficos
Autores principales: 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
proton-proton collisions
ATLAS detector
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85138
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85138
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
proton-proton collisions
ATLAS detector
spellingShingle Ciencias Exactas
Física
proton-proton collisions
ATLAS detector
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
Study of heavy-flavor quarks produced in association with top-quark pairs at √s =7 TeV using the ATLAS detector
topic_facet Ciencias Exactas
Física
proton-proton collisions
ATLAS detector
description Using a sample of dilepton top-quark pair (tt̄) candidate events, a study is performed of the production of top-quark pairs together with heavy-flavor (HF) quarks, the sum of tt̄+b+X and tt̄+c+X, collectively referred to as tt̄+HF. The data set used corresponds to an integrated luminosity of 4.7 fb<SUP>-1</SUP> of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. The presence of additional HF (b or c) quarks in the tt̄ sample is inferred by looking for events with at least three b-tagged jets, where two are attributed to the b quarks from the tt̄ decays and the third to additional HF production. The dominant background to tt̄+HF in this sample is tt̄+jet events in which a light-flavor jet is misidentified as a heavy-flavor jet. To determine the heavy- and light-flavor content of the additional b-tagged jets, a fit to the vertex mass distribution of b-tagged jets in the sample is performed. The result of the fit shows that 79±14(stat)±22(syst) of the 105 selected extra b-tagged jets originate from HF quarks, 3 standard deviations away from the hypothesis of zero tt̄+HF production. The result for extra HF production is quoted as a ratio (R<SUB>HF</SUB>) of the cross section for tt̄+HF production to the cross section for tt̄ production with at least one additional jet. Both cross sections are measured in a fiducial kinematic region within the ATLAS acceptance. R<SUB>HF</SUB> is measured to be [6.2±1.1(stat)±1.8(syst)]% for jets with p<SUB>T</SUB>>25 GeV and |η|<2.5, in agreement with the expectations from Monte Carlo generators.
format Articulo
Articulo
author Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_facet Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
author_sort Alonso, Francisco
title Study of heavy-flavor quarks produced in association with top-quark pairs at √s =7 TeV using the ATLAS detector
title_short Study of heavy-flavor quarks produced in association with top-quark pairs at √s =7 TeV using the ATLAS detector
title_full Study of heavy-flavor quarks produced in association with top-quark pairs at √s =7 TeV using the ATLAS detector
title_fullStr Study of heavy-flavor quarks produced in association with top-quark pairs at √s =7 TeV using the ATLAS detector
title_full_unstemmed Study of heavy-flavor quarks produced in association with top-quark pairs at √s =7 TeV using the ATLAS detector
title_sort study of heavy-flavor quarks produced in association with top-quark pairs at √s =7 tev using the atlas detector
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85138
work_keys_str_mv AT alonsofrancisco studyofheavyflavorquarksproducedinassociationwithtopquarkpairsats7tevusingtheatlasdetector
AT anduagaxabiersebastian studyofheavyflavorquarksproducedinassociationwithtopquarkpairsats7tevusingtheatlasdetector
AT dovamariateresa studyofheavyflavorquarksproducedinassociationwithtopquarkpairsats7tevusingtheatlasdetector
AT monticellifernandogabriel studyofheavyflavorquarksproducedinassociationwithtopquarkpairsats7tevusingtheatlasdetector
AT tripianamartinfernando studyofheavyflavorquarksproducedinassociationwithtopquarkpairsats7tevusingtheatlasdetector
AT theatlascollaboration studyofheavyflavorquarksproducedinassociationwithtopquarkpairsats7tevusingtheatlasdetector
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