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  • First Measurement of R(X_{τ/ℓ}) as an Inclusive Test of the b→cτν Anomaly
    Adachi, I; Aloisio, A; Aushev, V; Babu, V; Bansal, S; Beaubien, A; Bennett, J V; Biswas, D; Bondar, A; Bozek, A; Budano, A; Cao, L; Casarosa, G; Cheema, P; Chirapatpimol, K; Cho, S-J; Choi, S-K; De La Cruz-Burelo, E; De La Motte, S A; de Marino, G; De Nuccio, M; de Sangro, R; Destefanis, M; Dhamija, R; Dong, T V; Dubey, S; Ecker, P; Epifanov, D; Ferber, T; Fillinger, T; ti, F; Garcia-Hernandez, M; Gaur, V; Gaz, A; Ghosh, D; Ghumaryan, H; Giakoustidis, G; Gradl, W; Grammatico, T; Gruberová, Z; Gu, T; Han, Y; Hara, T; Higuchi, T; Hohmann, M; Ishikawa, A; Itoh, R; Iwasaki, M; Jia, S; Kawasaki, T; Keil, F; Kim, D Y; Kim, Y-K; Korobov, A; Kovalenko, E; Kraetzschmar, T M G; Kumara, K; Lacaprara, S; Le Diberder, F R; Levit, D; Li, L K; Liu, Q Y; Luo, T; Ma, Y; Maity, S; Manfredi, R; Mantovano, M; Marcello, S; Martinov, T; Matvienko, D; McKenna, J A; Meier, F; Merola, M; Molina-Gonzalez, N; Otani, F; Pardi, S; Pedlar, T K; Pestotnik, R; Piilonen, L E; Prim, M T; Rados, P; Rauls, N; Rocchetti, P; Roney, J M; Savinov, V; Shimasaki, T; Simon, F; Stavroulakis, P; Sumisawa, K; Tamponi, U; Tiwary, R; Torassa, E; Uematsu, Y; Urquijo, P; Wallner, S; Wang, M-Z; Wessel, C; Yelton, J; Yin, J H; Zhou, X Y

    Physical review letters, 05/2024, Letnik: 132, Številka: 21
    Journal Article

    We measure the tau-to-light-lepton ratio of inclusive B-meson branching fractions R(X_{τ/ℓ})≡B(B→Xτν)/B(B→Xℓν), where ℓ indicates an electron or muon, and thereby test the universality of charged-current weak interactions. We select events that have one fully reconstructed B meson and a charged lepton candidate from 189  fb^{-1} of electron-positron collision data collected with the Belle II detector. We find R(X_{τ/ℓ})=0.228±0.016(stat)±0.036(syst), in agreement with standard-model expectations. This is the first direct measurement of R(X_{τ/ℓ}).

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