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  • Precise Measurement of the D_{s}^{+} Lifetime at Belle II
    Adachi, I; Aihara, H; Akopov, N; Aushev, V; Babu, V; Bauer, M; Bennett, J V; Bertholet, E; Bilka, T; Branchini, P; Bussino, S; Campajola, M; Cecchi, C; Cerasoli, J; Chang, P; Cheema, P; Chilikin, K; Cho, K; De La Motte, S A; De Pietro, G; Di Capua, F; Dingfelder, J; Dort, K; Dubey, S; Ecker, P; Finocchiaro, G; ti, F; Frey, A; Fulsom, B G; Garmash, A; Gaur, V; Giakoustidis, G; Glazov, A; Gradl, W; Greenwald, D; Hayashii, H; Hazra, S; Hearty, C; Higuchi, T; Iijima, T; Ipsita, N; Jackson, P; Jaffe, D E; Jia, S; Kandra, J; Kawasaki, T; Keil, F; Ketter, C; Kiesling, C; Kim, D Y; Kim, Y-K; Kodyš, P; Kohani, S; Kojima, K; Kowalewski, R; Kraetzschmar, T M G; Kumar, R; Kwon, Y-J; Lewis, P M; Ma, Y; Maggiora, M; Maharana, S P; Mantovano, M; Marinas, C; Martini, A; Merola, M; Metzner, F; Miyabayashi, K; Mondal, S; Moneta, S; Mussa, R; Nazaryan, G; Nishida, S; Pedlar, T K; Peruzzi, I; Peschke, R; Pestotnik, R; Pham, F; Prim, M T; Raiz, S; Remnev, M; Rizzo, G; Schmitt, C; Senyo, K; Shan, W; Shillington, T; Simon, F; Spataro, S; Starič, M; Sumihama, M; Takahashi, M; Takizawa, M; Urquijo, P; Vahsen, S E; Vitale, L; Won, E; Yan, W; Yuan, C Z; Zhukova, V I; Žlebčík, R

    Physical review letters, 10/2023, Letnik: 131, Številka: 17
    Journal Article

    We measure the lifetime of the D_{s}^{+} meson using a data sample of 207  fb^{-1} collected by the Belle II experiment running at the SuperKEKB asymmetric-energy e^{+}e^{-} collider. The lifetime is determined by fitting the decay-time distribution of a sample of 116×10^{3} D_{s}^{+}→ϕπ^{+} decays. Our result is τ_{D_{s}^{+}}=(499.5±1.7±0.9)  fs, where the first uncertainty is statistical and the second is systematic. This result is significantly more precise than previous measurements.

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