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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: https://doi.org/10.1103/PhysRevLett.131.091903. |
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. |
URI: | http://bura.brunel.ac.uk/handle/2438/28002 |
DOI: | http://dx.doi.org/10.1103/PhysRevLett.131.091903 |
ISSN: | 1079-7114 |
Other Identifiers: | Article No.: 091903 ORCiD ID: Joanne Cole https://orcid.org/0000-0001-5638-7599 ORCiD ID: Akram Khan https://orcid.org/0000-0002-4597-4402 ORCiD ID: Paul Kyberd https://orcid.org/0000-0002-7353-7090 ORCiD ID: Ivan Reid https://orcid.org/0000-0002-9235-779X |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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