We measure the branching fraction of the decay B0 → J=ψω using data collected with the Belle II detector at the SuperKEKB collider. The data contain ð387 6Þ × 10 6 B ¯B meson pairs produced in energy-asymmetric eþe− collisions at the ϒð4SÞ resonance. The measured branching fraction BðB0 → J=ψωÞ ¼ ð2.16 0.30 0.14Þ × 10−5, where the first uncertainty is statistical and the second is systematic, is more precise than previous results and constitutes the first observation of the decay with a significance of 6.5 standard deviations.
Observation of the decay B0 →j/ψω at Belle II
F. Bianchi;A. Boschetti;M. Destefanis;M. Maggiora;S. Marcello;S. Spataro;
2025-01-01
Abstract
We measure the branching fraction of the decay B0 → J=ψω using data collected with the Belle II detector at the SuperKEKB collider. The data contain ð387 6Þ × 10 6 B ¯B meson pairs produced in energy-asymmetric eþe− collisions at the ϒð4SÞ resonance. The measured branching fraction BðB0 → J=ψωÞ ¼ ð2.16 0.30 0.14Þ × 10−5, where the first uncertainty is statistical and the second is systematic, is more precise than previous results and constitutes the first observation of the decay with a significance of 6.5 standard deviations.File in questo prodotto:
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