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Title

Observation of the Λb0→χc1 (3872) pK− decay

AuthorsLHCb Collaboration; García Martín, L.M.; Henry, L.; Jashal, B.; Martínez-Vidal, Fernando ; Oyanguren, Arantza ; Remón Alepuz, Clara; Ruiz Vidal, Joan; Sánchez Mayordomo, Carlos
Issue DateSep-2019
PublisherInstitute of Physics Publishing
CitationJournal of High Energy Physics 2019, 8: 028 (2019)
AbstractUsing proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9 fb of integrated luminosity at the centre-of-mass energies of 7, 8, and 13 TeV, respectively, the decay Λb0→χc1(3872)pK with χ(3872) → J/ψ ππ is observed for the first time. The significance of the observed signal is in excess of seven standard deviations. It is found that (58 ± 15)% of the decays proceed via the two-body intermediate state χ(3872)Λ(1520). The branching fraction with respect to that of the Λb0 → ψ(2S)pK decay mode, where the ψ(2S) meson is reconstructed in the J/ψ ππ final state, is measured to be:β(Λb0→χc1(3872)pK−)β(Λb0→ψ(2S)pK−)×β(χc1(3872)→J/ψπ+π−)β(ψ(2S)→J/ψπ+π−)=(5.4±1.1±0.2)×10−2, where the first uncertainty is statistical and the second is systematic. [Figure not available: see fulltext.]
Publisher version (URL)http://dx.doi.org/10.1007/JHEP09(2019)028
URIhttp://hdl.handle.net/10261/207791
Identifiersdoi: 10.1007/JHEP09(2019)028
issn: 1029-8479
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