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 → D0K+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(B0s → Ds1(2536)∓K±) × B(Ds1(2536)−→ D∗(2007)0K−)= (2.49 ± 0.11 ± 0.12 ± 0.25 ± 0.06) × 10−5, B(B0→ 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 → D0K+K− normalisation channel. The last uncertainty in the B0s result is due to the limited knowledge of the fragmentation fraction ratio, fs/fd. The signifcance for the B0s 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 diference between them 0.70 ± 0.09 ± 0.04 rad, where the frst uncertainty is statistical and the second systematic.

(2023). Observation of the decays B(s)0 → Ds1(2536)∓K± [journal article - articolo]. In JOURNAL OF HIGH ENERGY PHYSICS. Retrieved from https://hdl.handle.net/10446/263649

Observation of the decays B(s)0 → Ds1(2536)∓K±

Lupato, A.;Redi, F.;
2023-01-01

Abstract

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 → D0K+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(B0s → Ds1(2536)∓K±) × B(Ds1(2536)−→ D∗(2007)0K−)= (2.49 ± 0.11 ± 0.12 ± 0.25 ± 0.06) × 10−5, B(B0→ 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 → D0K+K− normalisation channel. The last uncertainty in the B0s result is due to the limited knowledge of the fragmentation fraction ratio, fs/fd. The signifcance for the B0s 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 diference between them 0.70 ± 0.09 ± 0.04 rad, where the frst uncertainty is statistical and the second systematic.
articolo
2023
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou,...espandi
(2023). Observation of the decays B(s)0 → Ds1(2536)∓K± [journal article - articolo]. In JOURNAL OF HIGH ENERGY PHYSICS. Retrieved from https://hdl.handle.net/10446/263649
File allegato/i alla scheda:
File Dimensione del file Formato  
JHEP10(2023)106.pdf

accesso aperto

Versione: publisher's version - versione editoriale
Licenza: Creative commons
Dimensione del file 1.02 MB
Formato Adobe PDF
1.02 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

Aisberg ©2008 Servizi bibliotecari, Università degli studi di Bergamo | Terms of use/Condizioni di utilizzo

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10446/263649
Citazioni
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 2
social impact