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Title: Search for an exotic decay of the Higgs boson into a Z boson and a pseudoscalar particle in proton-proton collisions at √<i>s</i> = 13 TeV
Other Titles: Search for an exotic decay of the Higgs boson into a Z boson and a pseudoscalar particle in proton-proton collisions at $\sqrt{s}$ = 13 TeV
Authors: Hayrapetyan, A
Tumasyan, A
Adam, W
Andrejkovic, JW
Bergauer, T
Chatterjee, S
Damanakis, K
Dragicevic, M
Escalante Del Valle, A
Hussain, PS
Jeitler, M
Lowette, S
Makarenko, I
Müller, D
Sahasransu, AR
Tavernier, S
Tytgat, M
Van Putte, S
Vannerom, D
Clerbaux, B
De Lentdecker, G
Favart, L
Hohov, D
Jaramillo, J
Khalilzadeh, A
Lee, K
Mahdavikhorrami, M
Malara, A
Paredes, S
Pétré, L
Postiau, N
Thomas, L
Vanden Bemden, M
Vander Velde, C
Vanlaer, P
De Coen, M
Dobur, D
Hong, Y
Knolle, J
Lambrecht, L
Mestdach, G
Rendón, C
Samalan, A
Skovpen, K
Van Den Bossche, N
Wezenbeek, L
Benecke, A
Bruno, G
Caputo, C
Delaere, C
Donertas, IS
Giammanco, A
Jaffel, K
Jain, S
Lemaitre, V
Lidrych, J
Mastrapasqua, P
Mondal, K
Tran, TT
Wertz, S
Alves, GA
Coelho, E
Hensel, C
Menezes De Oliveira, T
Moraes, A
Rebello Teles, P
Soeiro, M
Aldá Júnior, WL
Alves Gallo Pereira, M
Barroso Ferreira Filho, M
Brandao Malbouisson, H
Carvalho, W
Chinellato, J
Da Costa, EM
Da Silveira, GG
Reid, ID
De Jesus Damiao, D
Fonseca De Souza, S
Martins, J
Kyberd, P
Mora Herrera, C
Mota Amarilo, K
Khan, A
Mundim, L
Cole, JE
Coldham, K
Krammer, N
Liko, D
Mikulec, I
Schieck, J
Schöfbeck, R
Schwarz, D
Sonawane, M
Templ, S
Waltenberger, W
Wulz, CE
Darwish, MR
Janssen, T
Van Mechelen, P
Bols, ES
D'Hondt, J
Dansana, S
De Moor, A
Delcourt, M
El Faham, H
Keywords: CMS;axion like particles;Higgs
Issue Date: 18-Mar-2024
Publisher: Elsevier
Citation: Hayrapetyan, A. et al. for the benefit of the CMS Collaboration (2024) 'Search for an exotic decay of the Higgs boson into a Z boson and a pseudoscalar particle in proton-proton collisions at √<i>s</i> = 13 TeV', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 852, 138582, pp. 1 - 27. doi: 10.1016/j.physletb.2024.138582.
Abstract: A search for an exotic decay of the Higgs boson to a Z boson and a light pseudoscalar particle (a), decaying to a pair of leptons and a pair of photons, respectively, is presented. The search is based on proton-proton collision data at a center-of-mass energy of √s = 13 TeV, collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 138fb−1. The analysis probes pseudoscalar masses ma between 1 and 30 GeV, leading to two pairs of well-isolated leptons and photons. Upper limits at 95% confidence level are set on the Higgs boson production cross section times its branching fraction to two leptons and two photons. The observed (expected) limits are in the range of 1.1–17.8 (1.7–17.9) fb within the probed ma interval. An excess of data above the expected standard model background with a local (global) significance of 2.6 (1.3) standard deviations is observed for a mass hypothesis of ma = 3 GeV. Limits on models involving axion-like particles, formulated as an effective field theory, are also reported.
Description: Data availability: Release and preservation of data used by the CMS Collaboration as the basis for publications is guided by the CMS policy as stated in “CMS data preservation, re-use and open access policy” (
A preprint version is available at arXiv:2311.00130v2 [hep-ex], . Comments: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures, can be found at (CMS Public Pages). Report number: CMS-HIG-22-003, CERN-EP-2023-223.
ISSN: 0370-2693
Other Identifiers: ORCiD: A. Tumasyan
ORCiD: Joanne E Cole
ORCiD: Akram Khan
ORCiD: Paul Kyberd
ORCiD: Ivan D Reid
arXiv:2311.00130v2 [hep-ex]
Appears in Collections:Dept of Electronic and Electrical Engineering Research Papers

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