Speaker
Description
The SuperKEKB colliding-beam accelerator provides e+e− collisions at an energy corresponding to the mass of the Υ(4S) resonance, the products of which are being recorded by the Belle II detector. The mass of the Υ(4S) meson (∼ 10.58 GeV) is just above the threshold for decay into B-meson pairs. We measure the beam energy in the center of mass frame using fully reconstructed neutral and charged B decays from various final states. The measurement is performed using the beam-constrained mass of the reconstructed B decays. An accurate determination of the beam energy is important as a kinematic constraint in many analyses, as well as being an input for calibrations of the momentum and energy scale. We have calculated the average center-of-mass energy along with its uncertainty and the width of the distribution of the center-of-mass energy for the data recorded by the Belle II detector from 2020 to 2022.
| Session | Quark and Lepton Flavour Physics |
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