Аннотация

The suppressed decay Λb 0 → pπμ+μ, excluding the J/ψ and ψ(2S) → μ+μ resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of 3 fb−1 collected with the LHCb experiment. The Λb 0 → pπμ+μ branching fraction is measured relative to the Λb 0 → J/ψ(→μ+μ)pπ branching fraction givingℬ(Λb0→pπ−μ+μ−)ℬ(Λb0→J/ψ(→μ+μ−)pπ−)=0.044±0.012±0.007, where the first uncertainty is statistical and the second is systematic. This is the first observation of a b → d transition in a baryonic decay.[Figure not available: see fulltext.]

Язык оригиналаанглийский
Номер статьи029
Число страниц16
ЖурналJournal of High Energy Physics
Том2017
Номер выпуска4
DOI
СостояниеОпубликовано - 1 апр 2017

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