Search for new light gauge bosons in Higgs boson decays to four-lepton final states in pp collisions at √s = 8 TeV with the ATLAS detector at the LHC

This paper presents a search for Higgs bosons decaying to four leptons, either electrons or muons, via one or two light exotic gauge bosons Z<sub>d</sub>, H→ZZ<sub>d</sub>→4ℓ or H→Z<sub>d</sub>Z<sub>d</sub>→4ℓ. The search was performed using pp collisi...

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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
proton-proton collisions
ATLAS detector
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86910
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86910
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
Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Search for new light gauge bosons in Higgs boson decays to four-lepton final states in pp collisions at √s = 8 TeV with the ATLAS detector at the LHC
topic_facet Ciencias Exactas
Física
proton-proton collisions
ATLAS detector
description This paper presents a search for Higgs bosons decaying to four leptons, either electrons or muons, via one or two light exotic gauge bosons Z<sub>d</sub>, H→ZZ<sub>d</sub>→4ℓ or H→Z<sub>d</sub>Z<sub>d</sub>→4ℓ. The search was performed using pp collision data corresponding to an integrated luminosity of about 20 fb<sup>-1</sup> at the center-of-mass energy of √s = 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. The observed data are well described by the Standard Model prediction. Upper bounds on the branching ratio of H→ZZ<sub>d</sub>→4ℓ and on the kinetic mixing parameter between the Z<sub>d</sub> and the Standard Model hypercharge gauge boson are set in the range (1-9)×10<sup>-5</sup> and (4-17)×10-2 respectively, at 95% confidence level assuming the Standard Model branching ratio of H→ZZ*→4ℓ, for Z<sub>d</sub> masses between 15 and 55 GeV. Upper bounds on the effective mass mixing parameter between the Z and the Z<sub>d</sub> are also set using the branching ratio limits in the H→ZZ<sub>d</sub>→4ℓ search, and are in the range (1.5-8.7)×10<sup>-4</sup> for 15<m<SUB>Z<sub>d</sub></SUB><35 GeV. Upper bounds on the branching ratio of H→Z<sub>d</sub>Z<sub>d</sub>→4ℓ and on the Higgs portal coupling parameter, controlling the strength of the coupling of the Higgs boson to dark vector bosons are set in the range (2-3)×10<sup>-5</sup> and (1-10)×10<sup>-4</sup> respectively, at 95% confidence level assuming the Standard Model Higgs boson production cross sections, for Z<sub>d</sub> masses between 15 and 60 GeV.
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 Search for new light gauge bosons in Higgs boson decays to four-lepton final states in pp collisions at √s = 8 TeV with the ATLAS detector at the LHC
title_short Search for new light gauge bosons in Higgs boson decays to four-lepton final states in pp collisions at √s = 8 TeV with the ATLAS detector at the LHC
title_full Search for new light gauge bosons in Higgs boson decays to four-lepton final states in pp collisions at √s = 8 TeV with the ATLAS detector at the LHC
title_fullStr Search for new light gauge bosons in Higgs boson decays to four-lepton final states in pp collisions at √s = 8 TeV with the ATLAS detector at the LHC
title_full_unstemmed Search for new light gauge bosons in Higgs boson decays to four-lepton final states in pp collisions at √s = 8 TeV with the ATLAS detector at the LHC
title_sort search for new light gauge bosons in higgs boson decays to four-lepton final states in pp collisions at √s = 8 tev with the atlas detector at the lhc
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/86910
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