Measurement of the B0 lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019–2021 Belle II data

We measure the B0 lifetime and flavor-oscillation frequency using B0 → D ( * ) -π+ decays collected by the Belle II experiment in asymmetric-energy e+e- collisions produced by the SuperKEKB collider operating at the Υ ( 4 S ) resonance. We fit the decay-time distribution of signal decays, where the...

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Veröffentlicht in:	Physical review. D 2023-05, Vol.107 (9)
Hauptverfasser:	Aloisio, A., Asner, D. M., Atmacan, H., Bae, H., Bahinipati, S., Bansal, S., Barrett, M., Baudot, J., Bauer, M., Bernlochner, F. U., Bhuyan, B., Bilka, T., Bodrov, D., Bračko, M., Briere, R. A., Cecchi, C., Chilikin, K., Cho, K., Choi, S. -K., Cochran, J., De Nuccio, M., De Yta-Hernandez, A., Di Canto, A., Dingfelder, J., Doležal, Z., Dujany, G., Epifanov, D., Fillinger, T., Fodor, A., Forti, F., Fulsom, B. G., Garcia-Hernandez, M., Gaur, V., Gellrich, A., Ghevondyan, G., Giakoustidis, G., Glazov, A., Godang, R., Grammatico, T., Greenwald, D., Hara, K., Hara, T., Hayashii, H., Ipsita, N., Iwasaki, M., Jacobs, W. W., Jaffe, D. E., Junkerkalefeld, H., Kaleta, M., Kaliyar, A. B., Karyan, G., Kim, C. -H., Kindo, H., Kowalewski, R., Križan, P., Kuzmin, A., Lacaprara, S., Leboucher, R., Levit, D., Liu, Z. Q., Longo, S., Lueck, T., Maggiora, M., Manthei, A. C., Martini, A., Martinov, T., Meier, F., Miyabayashi, K., Molina-Gonzalez, N., Moneta, S., Mrvar, M., Ogawa, S., Onuki, Y., Oskin, P., Patra, S., Pedlar, T. K., Pestotnik, R., Prim, M. T., Reiter, S., Rostomyan, A., Serrano, J., Shen, C. P., Simon, F., Spataro, S., Stefkova, S., Suzuki, S. Y., Svidras, H., Tanaka, S., Tiwary, R., Uchida, M., Wang, E., Wang, Z., Warburton, A., Won, E., Xu, X. P., Yang, S. B., Yin, J. H., Yoshihara, K., Zani, L., Zhilich, V.
Format:	Artikel
Sprache:	eng
Schlagworte:	ASTRONOMY AND ASTROPHYSICS Bottom quark Hadron mixing Hadronic decays Lifetimes & widths Particle data analysis Particle properties Physics Quark mixing
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Beschreibung
Zusammenfassung:	We measure the B0 lifetime and flavor-oscillation frequency using B0 → D ( * ) -π+ decays collected by the Belle II experiment in asymmetric-energy e+e- collisions produced by the SuperKEKB collider operating at the Υ ( 4 S ) resonance. We fit the decay-time distribution of signal decays, where the initial flavor is determined by identifying the flavor of the other B meson in the event. The results, based on 33000 signal decays reconstructed in a data sample corresponding to 190 fb-1 , are τB0= ( 1.499±0.013± 0.008 ) ps , Δ md= ( 0.516±0.008±0.005 ) ps-1 , where the first uncertainties are statistical and the second are systematic. These results are consistent with the world-average values.
ISSN:	2470-0010
DOI:	10.1103/PhysRevD.107.L091102