Evidence for the spin-0 nature of the Higgs boson using ATLAS data

Studies of the spin and parity quantum numbers of the Higgs boson are presented, based on proton-proton collision data collected by the ATLAS experiment at the LHC. The Standard Model spin-parity J P =0 + hypothesis is compared with alternative hypotheses using the Higgs boson decays H→γγ, H→ZZ * →4...

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Autor principal: Aad, G.
Formato: JOUR
Materias:
Higgs boson
Parity
Spin
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03702693_v726_n1-3_p120_Aad
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_03702693_v726_n1-3_p120_Aad
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spelling todo:paper_03702693_v726_n1-3_p120_Aad2023-10-03T15:29:33Z Evidence for the spin-0 nature of the Higgs boson using ATLAS data Aad, G. Higgs boson Parity Spin Studies of the spin and parity quantum numbers of the Higgs boson are presented, based on proton-proton collision data collected by the ATLAS experiment at the LHC. The Standard Model spin-parity J P =0 + hypothesis is compared with alternative hypotheses using the Higgs boson decays H→γγ, H→ZZ * →4ℓ and H→WW * →ℓνℓν, as well as the combination of these channels. The analysed dataset corresponds to an integrated luminosity of 20.7 fb -1 collected at a centre-of-mass energy of s=8TeV. For the H→ZZ * →4ℓ decay mode the dataset corresponding to an integrated luminosity of 4.6 fb -1 collected at s=7TeV is included. The data are compatible with the Standard Model J P =0 + quantum numbers for the Higgs boson, whereas all alternative hypotheses studied in this Letter, namely some specific J P =0 - , 1 + , 1 - , 2 + models, are excluded at confidence levels above 97.8%. This exclusion holds independently of the assumptions on the coupling strengths to the Standard Model particles and in the case of the J P =2 + model, of the relative fractions of gluon-fusion and quark-antiquark production of the spin-2 particle. The data thus provide evidence for the spin-0 nature of the Higgs boson, with positive parity being strongly preferred. © 2013 CERN. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03702693_v726_n1-3_p120_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Higgs boson
Parity
Spin
spellingShingle Higgs boson
Parity
Spin
Aad, G.
Evidence for the spin-0 nature of the Higgs boson using ATLAS data
topic_facet Higgs boson
Parity
Spin
description Studies of the spin and parity quantum numbers of the Higgs boson are presented, based on proton-proton collision data collected by the ATLAS experiment at the LHC. The Standard Model spin-parity J P =0 + hypothesis is compared with alternative hypotheses using the Higgs boson decays H→γγ, H→ZZ * →4ℓ and H→WW * →ℓνℓν, as well as the combination of these channels. The analysed dataset corresponds to an integrated luminosity of 20.7 fb -1 collected at a centre-of-mass energy of s=8TeV. For the H→ZZ * →4ℓ decay mode the dataset corresponding to an integrated luminosity of 4.6 fb -1 collected at s=7TeV is included. The data are compatible with the Standard Model J P =0 + quantum numbers for the Higgs boson, whereas all alternative hypotheses studied in this Letter, namely some specific J P =0 - , 1 + , 1 - , 2 + models, are excluded at confidence levels above 97.8%. This exclusion holds independently of the assumptions on the coupling strengths to the Standard Model particles and in the case of the J P =2 + model, of the relative fractions of gluon-fusion and quark-antiquark production of the spin-2 particle. The data thus provide evidence for the spin-0 nature of the Higgs boson, with positive parity being strongly preferred. © 2013 CERN.
format JOUR
author Aad, G.
author_facet Aad, G.
author_sort Aad, G.
title Evidence for the spin-0 nature of the Higgs boson using ATLAS data
title_short Evidence for the spin-0 nature of the Higgs boson using ATLAS data
title_full Evidence for the spin-0 nature of the Higgs boson using ATLAS data
title_fullStr Evidence for the spin-0 nature of the Higgs boson using ATLAS data
title_full_unstemmed Evidence for the spin-0 nature of the Higgs boson using ATLAS data
title_sort evidence for the spin-0 nature of the higgs boson using atlas data
url http://hdl.handle.net/20.500.12110/paper_03702693_v726_n1-3_p120_Aad
work_keys_str_mv AT aadg evidenceforthespin0natureofthehiggsbosonusingatlasdata
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