Study of (W/Z)H production and Higgs boson couplings using H→WW* decays with the ATLAS detector

A search for Higgs boson production in association with a W or Z boson, in the H→WW* decay channel, is performed with a data sample collected with the ATLAS detector at the LHC in proton-proton collisions at centre-of-mass energies √s = 7TeV and 8TeV, corresponding to integrated luminosities of 4.5...

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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 hadron-hadron scattering Higgs physics Higgs boson w boson z boson
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/79212
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-79212
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 hadron-hadron scattering Higgs physics Higgs boson w boson z boson
spellingShingle	Ciencias Exactas Física hadron-hadron scattering Higgs physics Higgs boson w boson z boson Alconada Verzini, María Josefina Alonso, Francisco Arduh, Francisco Anuar Dova, María Teresa Monticelli, Fernando Gabriel Wahlberg, Hernán Pablo The ATLAS Collaboration Study of (W/Z)H production and Higgs boson couplings using H→WW* decays with the ATLAS detector
topic_facet	Ciencias Exactas Física hadron-hadron scattering Higgs physics Higgs boson w boson z boson
description	A search for Higgs boson production in association with a W or Z boson, in the H→WW* decay channel, is performed with a data sample collected with the ATLAS detector at the LHC in proton-proton collisions at centre-of-mass energies √s = 7TeV and 8TeV, corresponding to integrated luminosities of 4.5 fb−1 and 20.3 fb−1, respectively. The WH production mode is studied in two-lepton and three-lepton final states, while two-lepton and four-lepton final states are used to search for the ZH production mode. The observed significance, for the combined WH and ZH production, is 2.5 standard deviations while a significance of 0.9 standard deviations is expected in the Standard Model Higgs boson hypothesis. The ratio of the combined WH and ZH signal yield to the Standard Model expectation, μV H, is found to be μV H = 3.0+1.3 −1.1 (stat.)+1.0 −0.7 (sys.) for the Higgs boson mass of 125.36 GeV. The WH and ZH production modes are also combined with the gluon fusion and vector boson fusion production modes studied in the H → WW* → ℓvℓv decay channel, resulting in an overall observed significance of 6.5 standard deviations and μggF+VBF+VH = 1.16+0.16 −0.15(stat.)+0.18 −0.15(sys.). The results are interpreted in terms of scaling factors of the Higgs boson couplings to vector bosons (KV) and fermions (KF); the combined results are: \|KV\| = 1.06+0.10 −0.10, \|KF\| = 0.85+0.26 −0.20.
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	Study of (W/Z)H production and Higgs boson couplings using H→WW* decays with the ATLAS detector
title_short	Study of (W/Z)H production and Higgs boson couplings using H→WW* decays with the ATLAS detector
title_full	Study of (W/Z)H production and Higgs boson couplings using H→WW* decays with the ATLAS detector
title_fullStr	Study of (W/Z)H production and Higgs boson couplings using H→WW* decays with the ATLAS detector
title_full_unstemmed	Study of (W/Z)H production and Higgs boson couplings using H→WW* decays with the ATLAS detector
title_sort	study of (w/z)h production and higgs boson couplings using h→ww* decays with the atlas detector
publishDate	2015
url	http://sedici.unlp.edu.ar/handle/10915/79212
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bdutipo_str	Repositorios
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Study of (W/Z)H production and Higgs boson couplings using H→WW* decays with the ATLAS detector

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