The doubly Cabibbo-suppressed decay Ξ c + → pϕ with ϕ → K + K is observed for the first time, with a statistical significance of more than fifteen standard deviations. The data sample used in this analysis corresponds to an integrated luminosity of 2 fb −1 recorded with the LHCb detector in pp collisions at a centre-of-mass energy of 8 TeV. The ratio of branching fractions between the decay Ξ c + → pϕ and the singly Cabibbo-suppressed decay Ξ c + → pK π + is measured to beℬ(Ξc+→pϕ)ℬ(Ξc+→pK−π+)=(19.8±0.7±0.9±0.2)×10−3, where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the ϕ → K + K branching fraction.[Figure not available: see fulltext.]

Язык оригиналаанглийский
Номер статьи84
Число страниц18
ЖурналJournal of High Energy Physics
Номер выпуска4
СостояниеОпубликовано - 1 апр 2019

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