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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
Sirunyan, A. M. Sanders, Stephen J. The CMS collaboration
Sirunyan, A. M.
Sanders, Stephen J.
The CMS collaboration
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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.
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This work is licensed under a Creative Commons Attribution 4.0 International License.
Date
2019-10-10
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Springer Verlag
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Keywords
Beyond Standard Model, Hadron-Hadron scattering (experiments), Photon production
Citation
The CMS collaboration., Sirunyan, A.M., Tumasyan, A. et al. Search for dark photons in decays of Higgs bosons produced in association with Z bosons in proton-proton collisions at √𝑠 = 13 TeV. J. High Energ. Phys. 2019, 139 (2019). https://doi.org/10.1007/JHEP10(2019)139