Search for Invisible Decays of a Higgs Boson Produced in Association with a Z Boson in ATLAS
Number of Authors: 2901
2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 112, no 20, 201802- p.Article in journal (Refereed) Published
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 4.5 fb(-1) (20.3 fb(-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 < m(H) < 400 GeV, produced in association with a Z boson and decaying to invisible particles.
Place, publisher, year, edition, pages
2014. Vol. 112, no 20, 201802- p.
IdentifiersURN: urn:nbn:se:uu:diva-231808DOI: 10.1103/PhysRevLett.112.201802ISI: 000339554800003OAI: oai:DiVA.org:uu-231808DiVA: diva2:745245
ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.112.2018022014-09-102014-09-102014-09-10Bibliographically approved