We measure the branching fraction of the decay B-→D0ρ(770)- using data collected with the Belle II detector. The data contain 387 million BB¯ pairs produced in e+e- collisions at the ϒ(4S) resonance. We reconstruct 8360±180 decays from an analysis of the distributions of the B- energy and the ρ(770)- helicity angle. We determine the branching fraction to be (0.939±0.021(stat)±0.050(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
Gabrielli, A.;Ganiev, E.;Ghosh, D.;Lanceri, L.;Manfredi, R.;Mantovano, M.;Raiz, S.;Vitale, L.;
2024-01-01
Abstract
We measure the branching fraction of the decay B-→D0ρ(770)- using data collected with the Belle II detector. The data contain 387 million BB¯ pairs produced in e+e- collisions at the ϒ(4S) resonance. We reconstruct 8360±180 decays from an analysis of the distributions of the B- energy and the ρ(770)- helicity angle. We determine the branching fraction to be (0.939±0.021(stat)±0.050(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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PhysRevD.109.L111103.pdf
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