Observation of the doubly Cabibbo-suppressed decay Ξ c+→pϕ

LHCb Collaboration

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Abstract

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+→pKπ+ is measured to be

ℬ(Ξc+→pϕ)/ℬ(Ξc+→pKπ+)=(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+ branching fraction.

Original languageEnglish
Article number84
Number of pages18
JournalJournal of High Energy Physics
Volume2019
Issue number4
DOIs
Publication statusPublished - 10 Apr 2019

Keywords

  • Branching fraction
  • Charm physics
  • Flavor physics
  • Hadron-Hadron scattering (experiments)

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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