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Search for dark photons in decays of Higgs bosons produced in association with Z bosons in proton-proton collisions at √s = 13 TeV

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2019
Sirunyan2019_Article_SearchForDarkPhotonsInDecaysOf.pdf (516.4Kb)
Authors
Sirunyan, A M
Tumasyan, A
Adam, W
Ambrogi, F
Adžić, Petar
Ćirković, Predrag
Devetak, Damir
Đorđević, Miloš
Milenović, Predrag
Milošević, Jovan
Stojanović, Milan
Contributors
CMS Collaboration
CMS Collaboration (ukupan broj autora: 2293)
Article (Published version)
,
© 2019, The Author(s)
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Abstract
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. [Figure not available: see fulltext.]. © 2019, The Author(s).

Source:
Journal of High Energy Physics, 2019, 2019, 10

DOI: 10.1007/JHEP10(2019)139

ISSN: 1126-6708

WoS: 000492982300001

Scopus: 2-s2.0-85074147634
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http://vinar.vin.bg.ac.rs/handle/123456789/8639
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