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.

Язык оригиналаанглийский
Номер статьи131
Число страниц18
ЖурналJournal of High Energy Physics
Номер выпуска8
СостояниеОпубликовано - 1 авг. 2018


Подробные сведения о темах исследования «Observation of the decay Λ b 0 → ψ(2S)pπ». Вместе они формируют уникальный семантический отпечаток (fingerprint).