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http://bura.brunel.ac.uk/handle/2438/28002| 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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| FullText.pdf | © 2023 CERN, for the CMS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. | 36.44 MB | Adobe PDF | View/Open |
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