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

The CMS collaboration

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.].

Original languageEnglish
Article number139
JournalJournal of High Energy Physics
Volume2019
Issue number10
DOIs
Publication statusPublished - 1 Oct 2019

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Higgs bosons
bosons
collisions
protons
photons
decay
cross sections
center of mass
confidence
luminosity
products
energy

Keywords

  • Beyond Standard Model
  • Hadron-Hadron scattering (experiments)
  • Photon production

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

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

In: Journal of High Energy Physics, Vol. 2019, No. 10, 139, 01.10.2019.

Research output: Contribution to journalArticle

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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.].",
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KW - Hadron-Hadron scattering (experiments)

KW - Photon production

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