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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 $B^- \to D^0 ρ(770)^-$ at Belle II / II Collaboration, B., Adachi, I., Aggarwal, L., Aihara, H., Akopov, N., Aloisio, A., Anh Ky, N., Asner, D.M., Atmacan, H., Aushev, V., Aversano, M., Ayad, R., Babu, V., Bae, H., Bahinipati, S., Bambade, P., Banerjee, Sw., Bansal, S., Barrett, M., Baudot, J., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 109:11(2024). [10.1103/PhysRevD.109.L111103]

Measurement of the branching fraction of the decay $B^- \to D^0 ρ(770)^-$ at Belle II

A. Aloisio;M. Campajola;G. De Nardo;F. Di Capua;R. Giordano;M. Merola;
2024

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.
2024
Measurement of the branching fraction of the decay $B^- \to D^0 ρ(770)^-$ at Belle II / II Collaboration, B., Adachi, I., Aggarwal, L., Aihara, H., Akopov, N., Aloisio, A., Anh Ky, N., Asner, D.M., Atmacan, H., Aushev, V., Aversano, M., Ayad, R., Babu, V., Bae, H., Bahinipati, S., Bambade, P., Banerjee, Sw., Bansal, S., Barrett, M., Baudot, J., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 109:11(2024). [10.1103/PhysRevD.109.L111103]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/968143
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