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



Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Brandstetter, J, Dragicevic, M, Eroe, J, Escalante Del Valle, A, Flechl, M
et al (show 2314 more authors) (2019) Search for dark photons in decays of Higgs bosons produced in association with Z bosons in proton-proton collisions at √<i>s</i>=13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2019 (10).

Access the full-text of this item by clicking on the Open Access link.

Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>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<jats:sup> <jats:italic>−</jats:italic>1</jats:sup> 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.</jats:p>

Item Type: Article
Uncontrolled Keywords: Beyond Standard Model, Hadron-Hadron scattering (experiments), Photon production
Depositing User: Symplectic Admin
Date Deposited: 05 Dec 2019 16:40
Last Modified: 14 Oct 2023 08:55
DOI: 10.1007/JHEP10(2019)139
Open Access URL: https://doi.org/10.1007/JHEP10(2019)139
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3065022