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

Robert Appleby, Silvia Borghi, Christopher Burr, Stefano De Capua, Deepanwita Dutta, Evelina Gersabeck, Marco Gersabeck, Lucia Grillo, Martha Hilton, George Lafferty, Andrew Mcnab, Christopher Parkes, Gediminas Sarpis, Mark Williams, The LHCb Collaboration

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    The doubly Cabibbo-suppressed decay Ξ c +  →  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 +  →  and the singly Cabibbo-suppressed decay Ξ c +  → pKπ+ is measured to beB(Ξ+c→pϕ)B(Ξ+c→pK−π+)=(19.8±0.7±0.9±0.2)×10−3,B(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.
    Original languageEnglish
    JournalThe Journal of High Energy Physics
    Issue number84
    Early online date10 Apr 2019
    Publication statusPublished - Apr 2019


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