We measure the branching fraction of the decay B^- \to D^0 \rho(770)^- using data collected with the Belle II detector. The data contain 387 million B\overline{B} pairs produced in e^+e^- collisions at the \Upsilon(4S) resonance. We reconstruct 8360\pm 180 decays from an analysis of the distributions of the B^- energy and the \rho(770)^- helicity angle. We determine the branching fraction to be (0.939 \pm 0.021\mathrm{(stat)} \pm 0.050\mathrm{(syst)})\%, in agreement with previous results. Our measurement improves the relative precision of the world average by more than a factor of two.
Measurement of the branching fraction of the decay B- →d0ρ (770)- at Belle II
Tenchini, F.;
2024-01-01
Abstract
We measure the branching fraction of the decay B^- \to D^0 \rho(770)^- using data collected with the Belle II detector. The data contain 387 million B\overline{B} pairs produced in e^+e^- collisions at the \Upsilon(4S) resonance. We reconstruct 8360\pm 180 decays from an analysis of the distributions of the B^- energy and the \rho(770)^- helicity angle. We determine the branching fraction to be (0.939 \pm 0.021\mathrm{(stat)} \pm 0.050\mathrm{(syst)})\%, in agreement with previous results. Our measurement improves the relative precision of the world average by more than a factor of two.File in questo prodotto:
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