Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector

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The ATLAS experiment at the LHC has measured the Higgs boson couplings and mass, and searched for invisible Higgs boson decays, using multiple production and decay channels with up to 4.7 fb-1 of pp collision data at √s = 7TeV and 20.3 fb-1 at √s = 8TeV. In the current study, the measured production...

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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: 2015
Materias:
Ciencias Exactas
Física
supersymmetry
hadron-hadron scattering
Higgs physics
dark matter
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/79059
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-79059
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
supersymmetry
hadron-hadron scattering
Higgs physics
dark matter
spellingShingle Ciencias Exactas
Física
supersymmetry
hadron-hadron scattering
Higgs physics
dark matter
Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector
topic_facet Ciencias Exactas
Física
supersymmetry
hadron-hadron scattering
Higgs physics
dark matter
description The ATLAS experiment at the LHC has measured the Higgs boson couplings and mass, and searched for invisible Higgs boson decays, using multiple production and decay channels with up to 4.7 fb-1 of pp collision data at √s = 7TeV and 20.3 fb-1 at √s = 8TeV. In the current study, the measured production and decay rates of the observed Higgs boson in the γγ, ZZ, WW, Zγ, bb, ττ, and μμ decay channels, along with results from the associated production of a Higgs boson with a top-quark pair, are used to probe the scaling of the couplings with mass. Limits are set on parameters in extensions of the Standard Model including a composite Higgs boson, an additional electroweak singlet, and two-Higgs-doublet models. Together with the measured mass of the scalar Higgs boson in the γγ and ZZ decay modes, a lower limit is set on the pseudoscalar Higgs boson mass of mA > 370 GeV in the "hMSSM" simplified Minimal Supersymmetric Standard Model. Results from direct searches for heavy Higgs bosons are also interpreted in the hMSSM. Direct searches for invisible Higgs boson decays in the vector-boson fusion and associated production of a Higgs boson with W/Z (Z → ℓℓ, W/Z → jj) modes are statistically combined to set an upper limit on the Higgs boson invisible branching ratio of 0.25. The use of the measured visible decay rates in a more general coupling t improves the upper limit to 0.23, constraining a Higgs portal model of dark matter.
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 Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector
title_short Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector
title_full Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector
title_fullStr Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector
title_full_unstemmed Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector
title_sort constraints on new phenomena via higgs boson couplings and invisible decays with the atlas detector
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/79059
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