We report measurements of the e+e− → B ¯B, B ¯B∗, and B∗ ¯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∗ ¯B∗ threshold, the e+e− → B∗ ¯B∗ cross section increases rapidly. This may indicate the presence of a pole close to the threshold.
Measurement of the energy dependence of the e+e−→BB¯, BB¯∗, and B∗B¯∗ cross sections at Belle II
F. Bianchi;A. Boschetti;S. Das;M. Destefanis;M. Maggiora;S. Marcello;S. Spataro;
2024-01-01
Abstract
We report measurements of the e+e− → B ¯B, B ¯B∗, and B∗ ¯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∗ ¯B∗ threshold, the e+e− → B∗ ¯B∗ cross section increases rapidly. This may indicate the presence of a pole close to the threshold.
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