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Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/28002
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dc.contributor.authorHayrapetyan, A-
dc.contributor.authorTumasyan, A-
dc.contributor.authorAdam, W-
dc.contributor.authorAndrejkovic, JW-
dc.contributor.authorBergauer, T-
dc.contributor.authorChatterjee, S-
dc.contributor.authorDamanakis, K-
dc.contributor.authorDragicevic, M-
dc.contributor.authorEscalante Del Valle, A-
dc.contributor.authorHussain, PS-
dc.contributor.authorJeitler, M-
dc.contributor.authorKrammer, N-
dc.contributor.authorLiko, D-
dc.contributor.authorMikulec, I-
dc.contributor.authorSchieck, J-
dc.contributor.authorSchöfbeck, R-
dc.contributor.authorSchwarz, D-
dc.contributor.authorSonawane, M-
dc.contributor.authorTempl, S-
dc.contributor.authorWaltenberger, W-
dc.contributor.authorWulz, CE-
dc.contributor.authorDarwish, MR-
dc.contributor.authorJanssen, T-
dc.contributor.authorVan Mechelen, P-
dc.contributor.authorBols, ES-
dc.contributor.authorD'Hondt, J-
dc.contributor.authorDansana, S-
dc.contributor.authorDe Moor, A-
dc.contributor.authorDelcourt, M-
dc.contributor.authorEl Faham, H-
dc.contributor.authorLowette, S-
dc.contributor.authorMakarenko, I-
dc.contributor.authorMorton, A-
dc.contributor.authorMüller, D-
dc.contributor.authorSahasransu, AR-
dc.contributor.authorTavernier, S-
dc.contributor.authorTytgat, M-
dc.contributor.authorVan Putte, S-
dc.contributor.authorVannerom, D-
dc.contributor.authorClerbaux, B-
dc.contributor.authorDe Lentdecker, G-
dc.contributor.authorFavart, L-
dc.contributor.authorHohov, D-
dc.contributor.authorJaramillo, J-
dc.contributor.authorKhalilzadeh, A-
dc.contributor.authorLee, K-
dc.contributor.authorMahdavikhorrami, M-
dc.contributor.authorMalara, A-
dc.contributor.authorParedes, S-
dc.contributor.authorPétré, L-
dc.contributor.authorPostiau, N-
dc.contributor.authorThomas, L-
dc.contributor.authorVanden Bemden, M-
dc.contributor.authorVander Velde, C-
dc.contributor.authorVanlaer, P-
dc.contributor.authorDe Coen, M-
dc.contributor.authorDobur, D-
dc.contributor.authorKnolle, J-
dc.contributor.authorLambrecht, L-
dc.contributor.authorMestdach, G-
dc.contributor.authorRendón, C-
dc.contributor.authorSamalan, A-
dc.contributor.authorSkovpen, K-
dc.contributor.authorVan Den Bossche, N-
dc.contributor.authorWezenbeek, L-
dc.contributor.authorBenecke, A-
dc.contributor.authorBruno, G-
dc.contributor.authorCaputo, C-
dc.contributor.authorDelaere, C-
dc.contributor.authorDonertas, IS-
dc.contributor.authorGiammanco, A-
dc.contributor.authorJaffel, K-
dc.contributor.authorJain, S-
dc.contributor.authorLemaitre, V-
dc.contributor.authorLidrych, J-
dc.contributor.authorMastrapasqua, P-
dc.contributor.authorMondal, K-
dc.contributor.authorTran, TT-
dc.contributor.authorWertz, S-
dc.contributor.authorAlves, GA-
dc.contributor.authorCoelho, E-
dc.contributor.authorHensel, C-
dc.contributor.authorMenezes De Oliveira, T-
dc.contributor.authorMoraes, A-
dc.contributor.authorRebello Teles, P-
dc.contributor.authorSoeiro, M-
dc.contributor.authorAldá Júnior, WL-
dc.contributor.authorAlves Gallo Pereira, M-
dc.contributor.authorBarroso Ferreira Filho, M-
dc.contributor.authorBrandao Malbouisson, H-
dc.contributor.authorCarvalho, W-
dc.contributor.authorChinellato, J-
dc.contributor.authorDa Costa, EM-
dc.contributor.authorDa Silveira, GG-
dc.contributor.authorDe Jesus Damiao, D-
dc.contributor.authorFonseca De Souza, S-
dc.contributor.authorMartins, J-
dc.contributor.authorMora Herrera, C-
dc.contributor.authorMota Amarilo, K-
dc.contributor.authorMundim, L-
dc.date.accessioned2024-01-11T17:13:41Z-
dc.date.available2023-09-01-
dc.date.available2024-01-11T17:13:41Z-
dc.date.issued2023-09-01-
dc.identifierArticle No.: 091903-
dc.identifierORCiD ID: Joanne Cole https://orcid.org/0000-0001-5638-7599-
dc.identifierORCiD ID: Akram Khan https://orcid.org/0000-0002-4597-4402-
dc.identifierORCiD ID: Paul Kyberd https://orcid.org/0000-0002-7353-7090-
dc.identifierORCiD ID: Ivan Reid https://orcid.org/0000-0002-9235-779X-
dc.identifier.citationA. 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.en_US
dc.identifier.issn1079-7114-
dc.identifier.urihttp://bura.brunel.ac.uk/handle/2438/28002-
dc.description.abstractA 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.en_US
dc.description.sponsorshipFunded by SCOAP3en_US
dc.format.extent091903 - ?-
dc.publisherAmerican Physical Societyen_US
dc.rights© 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.-
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/-
dc.subjectMesonsen_US
dc.subjectHadron collidersen_US
dc.subjectParticle decaysen_US
dc.subjectParticles & fieldsen_US
dc.titleObservation of the Rare Decay of the η Meson to Four Muonsen_US
dc.typeArticleen_US
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevLett.131.091903-
dc.relation.isPartOfPhysical review letters-
pubs.issue9-
pubs.publication-statusPublished-
pubs.volume131-
dc.identifier.eissn1079-711-
Appears in Collections:Dept of Electronic and Electrical Engineering Research Papers

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