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Measurement of the energy dependence of the $e^+e^- \to B\bar{B}$, $B\bar{B}{}^*$, and $B^*\bar{B}{}^*$ cross sections at Belle~II
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arxiv 2405.18928 v2 pith:6O6W6C3R submitted 2024-05-29 hep-ex
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abstract
We report measurements of the $e^+e^- \to B\bar{B}$, $B\bar{B}{}^*$, and $B^*\bar{B}{}^*$ cross sections at four energies, 10653, 10701, 10746 and 10805 MeV, using data collected by the Belle~II experiment. We reconstruct one $B$ meson in a large number of hadronic final states and use its momentum to identify the production process. In the first $2-5$ MeV above $B^*\bar{B}{}^*$ threshold, the $e^+e^- \to B^*\bar{B}{}^*$ cross section increases rapidly. This may indicate the presence of a pole close to the threshold.
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Emergence of the exotic bottomoniumlike state $Y(10650)$ and support from Belle and Belle II data
hep-ph 2025-05 conditional novelty 6.0 of 10
A coupled-channel meson-exchange calculation predicts P-wave B(*)Bbar(*) states Y(10600) and Y(10650), with Y(10650) matching threshold anomalies in Belle and Belle II data.
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