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Aaij, R, Abdelmotteleb, ASW, Abellan Beteta, C, Abudinén, F, Ackernley, T 
ORCID: 0000-0002-5951-3498, Adefisoye, AA, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C et al (show 1142 more authors) , Aidala, CA, Ajaltouni, Z, Akar, S, Akiba, K, Albicocco, P, Albrecht, J, Alessio, F, Alexander, M, Aliouche, Z, Alvarez Cartelle, P, Amalric, R, Amato, S, Amey, JL, Amhis, Y, An, L, Anderlini, L, Andersson, M, Andreianov, A, Andreola, P, Andreotti, M, Andreou, D, Anelli, A, Ao, D, Archilli, F, Argenton, M, Arguedas Cuendis, S, Artamonov, A, Artuso, M, Aslanides, E, Ataíde Da Silva, R, Atzeni, M, Audurier, B, Bacher, D, Bachiller Perea, I, Bachmann, S, Bachmayer, M, Back, JJ, Baladron Rodriguez, P, Balagura, V, Balboni, A, Baldini, W, Balzani, L, Bao, H, Baptista de Souza Leite, J, Barbero Pretel, C, Barbetti, M, Barbosa, IR, Barlow, RJ, Barnyakov, M, Barsuk, S, Barter, W, Bartz, J, Basels, JM, Bashir, S, Bassi, G, Batsukh, B, Battista, PB, Bay, A, Beck, A, Becker, M, Bedeschi, F, Bediaga, IB, Behling, NA, Belin, S, Belous, K, Belov, I, Belyaev, I, Benane, G, 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Hutchcroft, D ORCID: 0000-0002-4174-6509, Idzik, M, Ilin, D, Ilten, P, Inglessi, A, Iniukhin, A, Ishteev, A, Ivshin, K, Jacobsson, R, Jage, H, Jaimes Elles, SJ, Jakobsen, S, Jans, E, Jashal, BK, Jawahery, A, Jevtic, V, Jiang, E, Jiang, X, Jiang, Y, Jiang, YJ, John, M, John Rubesh Rajan, A, Johnson, D, Jones, CR, Jones, TP, Joshi, S, Jost, B, Juan Castella, J, Jurik, N, Juszczak, I, Kaminaris, D, Kandybei, S, Kane, M, Kang, Y, Kar, C, Karacson, M, Karpenkov, D, Kauniskangas, A, Kautz, JW, Kazanecki, MK, Keizer, F, Kenzie, M, Ketel, T, Khanji, B, Kharisova, A, Kholodenko, S, Khreich, G, Kirn, T, Kirsebom, VS, Kitouni, O, Klaver, S, Kleijne, N, Klimaszewski, K, Kmiec, MR, Koliiev, S, Kolk, L, Konoplyannikov, A, Kopciewicz, P, Koppenburg, P, Korolev, M, Kostiuk, I, Kot, O, Kotriakhova, S, Kozachuk, A, Kravchenko, P, Kravchuk, L, Kreps, M, Krokovny, P, Krupa, W, Krzemien, W, Kshyvanskyi, O, Kubis, S, Kucharczyk, M, Kudryavtsev, V, Kulikova, E, Kupsc, A, Kutsenko, BK, Lacarrere, D, Laguarta 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(2025)
Test of Lepton Flavor Universality with B^{+}→K^{+}π^{+}π^{-}ℓ^{+}ℓ^{-} Decays.
Physical review letters, 134 (18).
181803-.
ISSN 0031-9007, 1079-7114
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Abstract
The first test of lepton flavor universality between muons and electrons using B^{+}→K^{+}π^{+}π^{-}ℓ^{+}ℓ^{-} (ℓ=e, μ) decays is presented. The measurement is performed with data from proton-proton collisions collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb^{-1}. The ratio of branching fractions between B^{+}→K^{+}π^{+}π^{-}e^{+}e^{-} and B^{+}→K^{+}π^{+}π^{-}μ^{+}μ^{-} decays is measured in the dilepton invariant-mass-squared range 1.1<q^{2}<7.0 GeV^{2}/c^{4} and is found to be R_{Kππ}^{-1}=1.31_{-0.17}^{+0.18}(stat) _{-0.09}^{+0.12}(syst), in agreement with the standard model prediction. The first observation of the B^{+}→K^{+}π^{+}π^{-}e^{+}e^{-} decay is also reported.
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