# Observation of the decay Λ b0 → ψ(2S)pπ−

The LHCb Collaboration

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

7 Цитирования (Scopus)

## Аннотация

The Cabibbo-suppressed decay Λb 0 → ψ(2S)pπ is observed for the first time using a data sample collected by the LHCb experiment in proton-proton collisions corresponding to 1.0, 2.0 and 1.9 fb−1 of integrated luminosity at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ψ(2S) mesons are reconstructed in the μ+μ final state. The branching fraction with respect to that of the Λb 0 → ψ(2S)pK decay mode is measured to be ℬ(Λb0→ψ(2S)pπ−)ℬ(Λb0→ψ(2S)pK−)=(11.4±1.3±0.2)%, where the first uncertainty is statistical and the second is systematic. The ψ(2S)p and ψ(2S)π mass spectra are investigated and no evidence for exotic resonances is found.[Figure not available: see fulltext.].

Язык оригинала английский 131 18 Journal of High Energy Physics 2018 8 https://doi.org/10.1007/JHEP08(2018)131 Опубликовано - 1 авг 2018