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dc.date.accessioned 2019-08-13T18:59:47Z
dc.date.available 2019-08-13T18:59:47Z
dc.date.issued 2015-07-17
dc.identifier.uri http://sedici.unlp.edu.ar/handle/10915/79061
dc.description.abstract Measurements of the ZZ and WW final states in the mass range above the 2mZ and 2mW thresholds provide a unique opportunity to measure the off-shell coupling strength of the Higgs boson. This paper presents constraints on the off-shell Higgs boson event yields normalised to the StandardModel prediction (signal strength) in the ZZ → 4ℓ , ZZ → 2ℓ2ν and WW → eνμν final states. The result is based on pp collision data collected by the ATLAS experiment at the LHC, corresponding to an integrated luminosity of 20.3 fb−1 at a collision energy of √ s = 8 TeV. Using the CLs method, the observed 95 % confidence level (CL) upper limit on the off-shell signal strength is in the range 5.1–8.6, with an expected range of 6.7–11.0. In each case the range is determined by varying the unknown gg → ZZ and gg → WW background K-factor from higher-order quantum chromodynamics corrections between half and twice the value of the known signal K-factor. Assuming the relevant Higgs boson couplings are independent of the energy scale of the Higgs boson production, a combination with the on-shell measurements yields an observed (expected) 95 %CL upper limit on ΓH/ ΓSM H in the range 4.5–7.5 (6.5–11.2) using the same variations of the background K-factor. Assuming that the unknown gg → VV background K-factor is equal to the signal K-factor, this translates into an observed (expected) 95 % CL upper limit on the Higgs boson total width of 22.7 (33.0) MeV. en
dc.format.extent 34 p. es
dc.language en es
dc.subject Higgs boson es
dc.subject ATLAS detector es
dc.subject standard model es
dc.title Constraints on the off-shell Higgs boson signal strength in the high-mass ZZ and WW final states with the ATLAS detector en
dc.type Articulo es
sedici.identifier.doi 10.1140/epjc/s10052-015-3542-2
sedici.identifier.issn 1434-6052 es
sedici.creator.person Alconada Verzini, María Josefina es
sedici.creator.person Alonso, Francisco es
sedici.creator.person Arduh, Francisco Anuar es
sedici.creator.person Dova, Maria Teresa es
sedici.creator.person Monticelli, Fernando Gabriel es
sedici.creator.person Wahlberg, Hernán Pablo es
sedici.creator.person The ATLAS Collaboration es
sedici.subject.materias Ciencias Exactas es
sedici.subject.materias Física es
sedici.description.fulltext true es
mods.originInfo.place Facultad de Ciencias Exactas es
sedici.subtype Articulo es
sedici.rights.license Creative Commons Attribution 4.0 International (CC BY 4.0)
sedici.rights.uri http://creativecommons.org/licenses/by/4.0/
sedici.description.peerReview peer-review es
sedici.relation.journalTitle The European Physical Journal C es
sedici.relation.journalVolumeAndIssue vol. 75, no. 7 es

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