Search for charged Higgs bosons through the violation of lepton universality in t ̄t events using pp collision data at √s = 7 TeV with the ATLAS experiment

In several extensions of the Standard Model, the top quark can decay into a bottom quark and a light charged Higgs boson H+, t → bH+, in addition to the Standard Model decay t → bW. Since W bosons decay to the three lepton generations equally, while H+ may predominantly decay into τν, charged Higgs...

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Autores principales: Alonso, Francisco, Anduaga, Xabier Sebastián, Dova, María Teresa, Monticelli, Fernando Gabriel, Tripiana, Martín Fernando, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Física
Higgs boson
leptons
proton-proton collisions
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/79322
https://arxiv.org/abs/1212.3572v2
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-79322
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Higgs boson
leptons
proton-proton collisions
spellingShingle Física
Higgs boson
leptons
proton-proton collisions
Alonso, Francisco
Anduaga, Xabier Sebastián
Dova, María Teresa
Monticelli, Fernando Gabriel
Tripiana, Martín Fernando
The ATLAS Collaboration
Search for charged Higgs bosons through the violation of lepton universality in t ̄t events using pp collision data at √s = 7 TeV with the ATLAS experiment
topic_facet Física
Higgs boson
leptons
proton-proton collisions
description In several extensions of the Standard Model, the top quark can decay into a bottom quark and a light charged Higgs boson H+, t → bH+, in addition to the Standard Model decay t → bW. Since W bosons decay to the three lepton generations equally, while H+ may predominantly decay into τν, charged Higgs bosons can be searched for using the violation of lepton universality in top quark decays. The analysis in this paper is based on 4.6 fb−1 of proton–proton collision data at √ s = 7 TeV collected by the ATLAS experiment at the Large Hadron Collider. Signatures containing leptons (e or μ) and/or a hadronically decaying τ (τhad) are used. Event yield ratios between e+τhad and e+μ, as well as between μ+τhad and μ+e, final states are measured in the data and compared to predictions from simulations. This ratio-based method reduces the impact of systematic uncertainties in the analysis. No significant deviation from the Standard Model predictions is observed. With the assumption that the branching fraction B(H+ → τν) is 100%, upper limits in the range 3.2%–4.4% can be placed on the branching fraction B(t → bH+) for charged Higgs boson masses mH+ in the range 90–140 GeV. After combination with results from a search for charged Higgs bosons in tt ̄decays using the τhad+jets final state, upper limits on B(t → bH+) can be set in the range 0.8%–3.4%, for mH+ in the range 90–160 GeV.
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 Search for charged Higgs bosons through the violation of lepton universality in t ̄t events using pp collision data at √s = 7 TeV with the ATLAS experiment
title_short Search for charged Higgs bosons through the violation of lepton universality in t ̄t events using pp collision data at √s = 7 TeV with the ATLAS experiment
title_full Search for charged Higgs bosons through the violation of lepton universality in t ̄t events using pp collision data at √s = 7 TeV with the ATLAS experiment
title_fullStr Search for charged Higgs bosons through the violation of lepton universality in t ̄t events using pp collision data at √s = 7 TeV with the ATLAS experiment
title_full_unstemmed Search for charged Higgs bosons through the violation of lepton universality in t ̄t events using pp collision data at √s = 7 TeV with the ATLAS experiment
title_sort search for charged higgs bosons through the violation of lepton universality in t ̄t events using pp collision data at √s = 7 tev with the atlas experiment
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/79322
https://arxiv.org/abs/1212.3572v2
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