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Search for invisible decays of a Higgs boson produced in association with a Z boson in ATLAS
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.ORCID-id: 0000-0003-3867-0336
Vise andre og tillknytning
Rekke forfattare: 29162014 (engelsk)Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 112, nr 20Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A search for evidence of invisible-particle decay modes of a Higgs boson produced in association with a Z boson at the Large Hadron Collider is presented. No deviation from the standard model expectation is observed in 4.5fb-1 (20.3fb-1) of 7 (8) TeV pp collision data collected by the ATLAS experiment. Assuming the standard model rate for ZH production, an upper limit of 75%, at the 95% confidence level is set on the branching ratio to invisible-particle decay modes of the Higgs boson at a mass of 125.5 GeV. The limit on the branching ratio is also interpreted in terms of an upper limit on the allowed dark matter-nucleon scattering cross section within a Higgs-portal dark matter scenario. Within the constraints of such a scenario, the results presented in this Letter provide the strongest available limits for low-mass dark matter candidates. Limits are also set on an additional neutral Higgs boson, in the mass range 110 < mH < 400 GeV, produced in association with a Z boson and decaying to invisible particles.

sted, utgiver, år, opplag, sider
2014. Vol. 112, nr 20
Emneord [en]
Colliding beam accelerators, Electric breakdown, Galaxies, Scattering, Tellurium compounds, ATLAS experiment, Branching ratio, Confidence levels, Large Hadron Collider, Neutral Higgs bosons, Scattering cross section, The standard model, Upper limits, Bosons
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Identifikatorer
URN: urn:nbn:se:kth:diva-150639DOI: 10.1103/PhysRevLett.112.201802ISI: 000339554800003Scopus ID: 2-s2.0-84901405418OAI: oai:DiVA.org:kth-150639DiVA, id: diva2:744343
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QC 20140908

Tilgjengelig fra: 2014-09-08 Laget: 2014-09-08 Sist oppdatert: 2019-12-04bibliografisk kontrollert

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Jovicevic, JelenaKuwertz, EmmaLund-Jensen, BengtMorley, AnthonyStrandberg, Jonas
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