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

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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 be B(Ξ+c→pϕ)B(Ξ+c→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.

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Journal of High Energy Physics, 2019, p. 84

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cc-by (c) LHCb Collaboration et al., 2019

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Articles publicats en revistes (Física Quàntica i Astrofísica)

# metadata.dc.title[].value
Observation of the doubly Cabibbo-suppressed decay Ξ c+ → pϕ