Observation of the decays B0 (s) → Ds1(2536)∓K±
This paper reports the observation of the decays B0 (s) → Ds1(2536)∓K± using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1 . The branching fractions of these decays are measured relative to the normalisation channel B0 → D 0K+K−. T...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universitat Ramon Llull (URL) |
| Repositorio: | DAU Arxiu Digital de la Universitat Ramon Llull |
| OAI Identifier: | oai:dnet:dau_________::524d016f2a78bab3b5bbc9d659c16cc7 |
| Acceso en línea: | https://hdl.handle.net/20.500.14342/6449 https://doi.org/10.1007/JHEP10(2023)106 |
| Access Level: | acceso abierto |
| Palabra clave: | B Physics Branching fraction Flavour Physics Hadron-Hadron Scattering Decay Processes Experimental Nuclear Physics Nuclear Physics Gran col·lisionador d'hadrons 51 53 539 |
| Sumario: | This paper reports the observation of the decays B0 (s) → Ds1(2536)∓K± using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1 . The branching fractions of these decays are measured relative to the normalisation channel B0 → D 0K+K−. The Ds1(2536)− meson is reconstructed in the D ∗ (2007)0K− decay channel and the products of branching fractions are measured to be B(B 0 s → Ds1(2536)∓K±) × B(Ds1(2536)−→ D ∗ (2007)0K−) = (2.49 ± 0.11 ± 0.12 ± 0.25 ± 0.06) × 10−5 , B(B 0→ Ds1(2536)∓K±) × B(Ds1(2536)−→ D ∗ (2007)0K−) = (0.510 ± 0.021 ± 0.036 ± 0.050) × 10−5 . The first uncertainty is statistical, the second systematic, and the third arises from the uncertainty of the branching fraction of the B0 → D 0K+K− normalisation channel. The last uncertainty in the B0 s result is due to the limited knowledge of the fragmentation fraction ratio, fs/fd. The significance for the B0 s and B0 signals is larger than 10 σ. The ratio of the helicity amplitudes which governs the angular distribution of the Ds1(2536)− → D ∗ (2007)0K− decay is determined from the data. The ratio of the S- and D-wave amplitudes is found to be 1.11±0.15±0.06 and the phase difference between them 0.70 ± 0.09 ± 0.04 rad, where the first uncertainty is statistical and the second systematic. |
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