Published January 1, 2024
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Measurement of the energy dependence of the e<SUP>+</SUP> e<SUP>-</SUP> → <i>B</i>(<i>B</i>)over-bar, <i>B</i>(<i>B</i>)over-bar*, and <i>B</i>*(<i>B</i>)over-bar* cross sections at Belle II
Description
We report measurements of the e(+)e(-) -> B (B) over bar, B (B) over bar*, and B*(B) over bar* 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* B* threshold, the e(+)e(-) -> B*(B) over bar* cross section increases rapidly. This may indicate the presence of a pole close to the threshold.
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