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Дата последнего поиска статьи во внешних источниках: 20 ноября 2020 г.
Аннотация:Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9fb−1 of integrated luminosity at the centre-of-mass energies of 7, 8, and 13 TeV, respectively, the decay Λ0b→χc1(3872)pK− with χc1→J/ψπ+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 Λb→ψ(2S)pK− decay mode, where the ψ(2S) meson is reconstructed in the J/ψπ+π− final state, is measured to be:
Λ0b→χc1(3872)pK−Λb→ψ(2S)pK−×B(χc1→J/ψπ+π−)B(ψ(2S)→J/ψπ+π−)=(5.4±1.1±0.2)×10−2,
where the first uncertainty is statistical and the second is systematic.