Abstract
We report the first measurement of the inclusive e+e− → \( b\overline{b} \) → \( {D}_s^{\pm } \) X and e+e− → \( b\overline{b} \) → D0/\( {\overline{D}}^0 \) X cross sections in the energy range from 10.63 to 11.02 GeV. Based on these results, we determine σ(e+e− → \( {B}_s^0{\overline{B}}_s^0 \) X) and σ(e+e− → \( B\overline{B} \) X) in the same energy range. We measure the fraction of \( {B}_s^0 \) events at Υ(10860) to be fs = (\( {22.0}_{-2.1}^{+2.0} \))%. We determine also the ratio of the \( {B}_s^0 \) inclusive branching fractions \( \mathcal{B} \)(\( {B}_s^0 \) → D0/\( {\overline{D}}^0 \) X)/\( \mathcal{B} \)(\( {B}_s^0 \) → \( {D}_s^{\pm } \) X) = 0.416 ± 0.018 ± 0.092. The results are obtained using the data collected with the Belle detector at the KEKB asymmetric-energy e+e− collider.
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Acknowledgments
This work, based on data collected using the Belle detector, which was operated until June 2010, was supported by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan, the Japan Society for the Promotion of Science (JSPS), and the Tau-Lepton Physics Research Center of Nagoya University; the Australian Research Council including grants DP210101900, DP210102831, LE230100085; Science and Research (FWF) and FWF Austrian Science Fund No. P 31361-N36; the National Natural Science Foundation of China under Contracts No. 11675166, No. 11975076; No. 12175041; Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS), Grant No. QYZDJ-SSW-SLH011; ZR2022JQ02 supported by Shandong Provincial Natural Science Foundation; the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LTT17020; the Czech Science Foundation Grant No. 22-18469S; Horizon 2020 ERC Advanced Grant No. 884719 and ERC Starting Grant No. 947006 “InterLeptons” (European Union); the Carl Zeiss Foundation, the Deutsche Forschungsgemeinschaft, the Excellence Cluster Universe, and the VolkswagenStiftung; the Department of Atomic Energy (Project Identification No. RTI 4002) and the Department of Science and Technology of India; the Istituto Nazionale di Fisica Nucleare of Italy; National Research Foundation (NRF) of Korea Grant Nos. 2016R1D1A1B02012900, 2018R1A2B3003643, 2018R1A6A1A06024970, RS202200197659, 2019R1I1A3A01058933, 2021R1A6A1A03043957, 2021R1F1A1060423, 2021R1F1A1064008, 2022R1A2C1003993; Radiation Science Research Institute, Foreign Large-size Research Facility Application Supporting project, the Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information and KREONET/GLORIAD; the Polish Ministry of Science and Higher Education and the National Science Center; the Ministry of Science and Higher Education of the Russian Federation, Agreement 14.W03.31.0026, Basic Research Program, Moscow; research grants S-1440-0321, S-0256-1438, and S-0280-1439 (Saudi Arabia); the Slovenian Research Agency Grant Nos. J1-9124 and P1-0135; Ikerbasque, Basque Foundation for Science, Spain; the Swiss National Science Foundation; the Ministry of Education and the Ministry of Science and Technology of Taiwan; and the United States Department of Energy and the National Science Foundation. These acknowledgements are not to be interpreted as an endorsement of any statement made by any of our institutes, funding agencies, governments, or their representatives. We thank the KEKB group for the excellent operation of the accelerator; the KEK cryogenics group for the efficient operation of the solenoid; and the KEK computer group and the Pacific Northwest National Laboratory (PNNL) Environmental Molecular Sciences Laboratory (EMSL) computing group for strong computing support; and the National Institute of Informatics, and Science Information NETwork 6 (SINET6) for valuable network support.
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The Belle collaboration., Zhukova, V., Mizuk, R. et al. Measurement of the e+e− → \( {B}_s^0{\overline{B}}_s^0X \) cross section in the energy range from 10.63 to 11.02 GeV using inclusive \( {D}_s^{+} \) and D0 production. J. High Energ. Phys. 2023, 131 (2023). https://doi.org/10.1007/JHEP08(2023)131
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DOI: https://doi.org/10.1007/JHEP08(2023)131