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

2013-10-07Journal article Open access
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dc.contributor.authorATLAS collaboration (2923 authors)
dc.contributor.authorAguilar-Saavedra, Juan Antonio
dc.contributor.authorAmor Dos Santos, Susana Patricia
dc.contributor.authorAnjos, Nuno
dc.contributor.authorCantrill, Robert
dc.contributor.authorCarvalho, João
dc.contributor.authorCastro, Nuno Filipe
dc.contributor.authorConde Muiño, Patricia
dc.contributor.authorDa Cunha Sargedas De Sousa, Mario Jose
dc.contributor.authorDo Valle Wemans, André
dc.contributor.authorFiolhais, Miguel
dc.contributor.authorGalhardo, Bruno
dc.contributor.authorGomes, Agostinho
dc.contributor.authorGonçalo, Ricardo
dc.contributor.authorJorge, Pedro
dc.contributor.authorLopes, Lourenco
dc.contributor.authorMachado Miguens, Joana
dc.contributor.authorMaio, Amélia
dc.contributor.authorManeira, José
dc.contributor.authorMarques, Carlos
dc.contributor.authorOliveira, Miguel Alfonso
dc.contributor.authorOnofre, António
dc.contributor.authorPalma, Alberto
dc.contributor.authorPina, João Antonio
dc.contributor.authorPinto, Belmiro
dc.contributor.authorSantos, Helena
dc.contributor.authorSaraiva, João
dc.contributor.authorSilva, José
dc.contributor.authorTavares Delgado, Ademar
dc.contributor.authorVeloso, Filipe
dc.contributor.authorWolters, Helmut
dc.date.accessioned2019-02-03T23:08:13Z
dc.date.available2019-02-03T23:08:13Z
dc.date.issued2013-10-07
dc.date.updated2019-02-03T23:08:13Z
dc.description.abstractStudies 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 $H \to \gamma\gamma, H \to ZZ^* \to 4$ leptons and $H \to WW^* \to l\nu l\nu$, 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 $\sqrt{s}$ = 8 TeV. For the $H \to ZZ^* \to 4$-lepton decay mode the dataset corresponding to an integrated luminosity of 4.6 fb$^{-1}$ collected at $\sqrt{s}$ = 7 TeV is added. 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.
dc.description.versionPeer Reviewed
dc.identifierPhys.Lett. B726 (2013) 120-144; DOI 10.1016/j.physletb.2013.08.026
dc.identifier.urihttp://dx.doi.org/10.1016/j.physletb.2013.08.026
dc.identifier.urihttp://hdl.handle.net/10400.26/26445
dc.language.isoeng
dc.relationEuropean Grid Initiative: Integrated Sustainable Pan-European Infrastructure for Researchers in Europe
dc.titleEvidence for the spin-0 nature of the Higgs boson using ATLAS data
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleEuropean Grid Initiative: Integrated Sustainable Pan-European Infrastructure for Researchers in Europe
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/261323/EU
oaire.fundingStreamFP7
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
rcaap.rightsopenAccesspt
rcaap.typearticle
relation.isProjectOfPublication581c11bf-ae68-4acb-bdae-f350d90cb7f7
relation.isProjectOfPublication.latestForDiscovery581c11bf-ae68-4acb-bdae-f350d90cb7f7

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