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Title
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Search for dark photons in decays of Higgs bosons produced in association with Z bosons in proton-proton collisions at =13 TeV
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Author
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Institution/Organisation
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CMS Collaboration
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Abstract
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| A search is presented for a Higgs boson that is produced in association with a Z boson and that decays to an undetected particle together with an isolated photon. The search is performed by the CMS Collaboration at the Large Hadron Collider using a data set corresponding to an integrated luminosity of 137 fb(-1) recorded at a center-of-mass energy of 13 TeV. No significant excess of events above the expectation from the standard model background is found. The results are interpreted in the context of a theoretical model in which the undetected particle is a massless dark photon. An upper limit is set on the product of the cross section for associated Higgs and Z boson production and the branching fraction for such a Higgs boson decay, as a function of the Higgs boson mass. For a mass of 125 GeV, assuming the standard model production cross section, this corresponds to an observed (expected) upper limit on this branching fraction of 4.6 (3.6)% at 95% confidence level. These are the first limits on Higgs boson decays to final states that include an undetected massless dark photon. |
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Language
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English
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Source (journal)
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Journal of high energy physics. - Bristol
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Publication
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Bristol
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2019
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ISSN
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1126-6708
1029-8479
[online]
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DOI
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10.1007/JHEP10(2019)139
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Volume/pages
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10
(2019)
, 37 p.
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Article Reference
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139
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ISI
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000492982300001
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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