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Title: Observation of the Rare Decay of the η Meson to Four Muons
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
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
Lowette, S
Makarenko, I
Morton, A
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
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
De Jesus Damiao, D
Fonseca De Souza, S
Martins, J
Mora Herrera, C
Mota Amarilo, K
Mundim, L
Keywords: Mesons;Hadron colliders;Particle decays;Particles & fields
Issue Date: 1-Sep-2023
Publisher: American Physical Society
Citation: A. Hayrapetyan et al. (CMS Collaboration). (2023). 'Observation of the Rare Decay of the η Meson to Four Muons' in Physical review letters, Vol.131 (9)., pp. 1 - 19. DOI:
Abstract: A search for the rare η→μ+μ−μ+μ− double-Dalitz decay is performed using a sample of proton-proton collisions, collected by the CMS experiment at the CERN LHC with high-rate muon triggers during 2017 and 2018 and corresponding to an integrated luminosity of 101  fb−1. A signal having a statistical significance well in excess of 5 standard deviations is observed. Using the η→μ+μ− decay as normalization, the branching fraction B(η→μ+μ−μ+μ−)=[5.0±0.8(stat)±0.7(syst)±0.7(B2μ)]×10−9 is measured, where the last term is the uncertainty in the normalization channel branching fraction. This work achieves an improved precision of over 5 orders of magnitude compared to previous results, leading to the first measurement of this branching fraction, which is found to agree with theoretical predictions.
ISSN: 1079-7114
Other Identifiers: Article No.: 091903
ORCiD ID: Joanne Cole
ORCiD ID: Akram Khan
ORCiD ID: Paul Kyberd
ORCiD ID: Ivan Reid
Appears in Collections:Dept of Electronic and Electrical Engineering Research Papers

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