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Regular version of the site

Article

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

Journal of High Energy Physics. 2019. No. 09(2019)28. P. 1-19.
Maevskiy, A., Boldyrev, A, Derkach, D., Hushchyn, M., Kazeev, N., Ratnikov, F., Ustyuzhanin, A., Belavin, V., Borisyak, M., K. Arzymatov.

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 Λ0b→χc1Λb0→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 Λ0bΛb0 → 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(Λ0b→χc1(3872)pK−)𝛽(Λ0b→ψ(2S)pK−)×𝛽(χc1(3872)→J/ψπ+π−)𝛽(ψ(2S)→J/ψπ+π−)=(5.4±1.1±0.2)×10−2,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.