Observation of the Λb0→χc1 (3872) pK decay

The LHCb Collaboration

Результат исследований: Материалы для журналаСтатья

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Аннотация

Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9 fb−1 of integrated luminosity at the centre-of-mass energies of 7, 8, and 13 TeV, respectively, the decay Λb0→χc1(3872)pK with χc1(3872) → J/ψ π+π 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 χc1(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 π+π 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.]

Язык оригиналаАнглийский
Номер статьи28
ЖурналJournal of High Energy Physics
Том2019
Номер выпуска9
DOI
СостояниеОпубликовано - 1 сен 2019

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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