Search for dark photons in decays of Higgs bosons produced in association with Z bosons in proton-proton collisions at s $$\sqrt{s}$$ = 13 TeV
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.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- The CMS collaboration
- Grant/Contract Number:
- AC02-07CH11359; SC0010005
- OSTI ID:
- 1557450
- Alternate ID(s):
- OSTI ID: 1600511
- Report Number(s):
- FERMILAB-PUB-19-409-CMS; arXiv:1908.02699; CMS-EXO-19-007; CERN-EP-2019-159; oai:inspirehep.net:1748735
- Journal Information:
- Journal of High Energy Physics (Online), Vol. 2019, Issue 10; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Higgs phenomenology as a probe of sterile neutrinos
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journal | December 2019 |
Higgs phenomenology as a probe of sterile neutrinos | text | January 2019 |
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