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http://bura.brunel.ac.uk/handle/2438/19603
Title: | Search for dark photons in decays of Higgs bosons produced in association with Z bosons in proton-proton collisions at √s = 13 TeV |
Authors: | Sirunyan, AM Tumasyan, A Adam, W Ambrogi, F Bergauer, T Brandstetter, J Dragicevic, M Erö, J Escalante Del Valle, A Flechl, M Frühwirth, R Alves, FL Alves, GA Kyberd, P Correia Silva, G Hensel, C Khan, A Moraes, A Hobson, PR Cole, JE Jeitler, M Krammer, N Krätschmer, I Liko, D Madlener, T Mikulec, I Rad, N Schieck, J Morton, A Schöfbeck, R Spanring, M Spitzbart, D Waltenberger, W Wulz, CE Zarucki, M Drugakov, V Teodorescu, L Mossolov, V Suarez Gonzalez, J Darwish, MR De Wolf, EA Di Croce, D Janssen, X Lelek, A Pieters, M Rejeb Sfar, H Van Haevermaet, H Van Mechelen, P Van Putte, S Van Remortel, N Blekman, F Bols, ES Chhibra, SS D’Hondt, J De Clercq, J Lontkovskyi, D Lowette, S Marchesini, I Moortgat, S Python, Q Skovpen, K Tavernier, S Van Doninck, W Van Mulders, P Beghin, D Bilin, B Brun, H Clerbaux, B De Lentdecker, G Delannoy, H Dorney, B Favart, L Grebenyuk, A Kalsi, AK Popov, A Postiau, N Starling, E Thomas, L Vander Velde, C Vanlaer, P Vannerom, D Cornelis, T Dobur, D Khvastunov, I Niedziela, M Zahid, S Roskas, C Trocino, D Tytgat, M Verbeke, W Vermassen, B Vit, M Zaganidis, N Bondu, O Bruno, G Caputo, C David, P Reid, ID Delaere, C Delcourt, M Giammanco, A Lemaitre, V Magitteri, A Prisciandaro, J Saggio, A Marono, MV Vischia, P Mackay, CK Zobec, J |
Keywords: | beyond standard model;hadron-hadron scattering (experiments);photon production |
Issue Date: | 10-Oct-2019 |
Publisher: | Published for SISSA by Springer |
Citation: | Journal of High Energy Physics, 2019, 2019(10): 139 pp. 1 - 37 |
Abstract: | © The Author(s) 2019. 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. |
URI: | https://bura.brunel.ac.uk/handle/2438/19603 |
DOI: | https://doi.org/10.1007/JHEP10(2019)139 |
ISSN: | 1126-6708 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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