Observation of the doubly Cabibbo-suppressed decay ${\Xi }_c^{+}\to p\varphi$

Abstract

The doubly Cabibbo-suppressed decay ${\Xi }_c^{+}\to p\varphi$ with $\varphi \to K^{+}{K}^{-}$ 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 ${\Xi }_c^{+}\to p\varphi$ and the singly Cabibbo-suppressed decay ${\Xi }_c^{+}\to p{K}^{-}{\pi }^{+}$ is measured to be \begin{equation*} \frac{\mathcal{B}(Ξ_{c}^{+}\to pϕ)}{\mathcal{B}(Ξ_{c}^{+}\to pK^{-}π^{+})} = (19.8 \pm 0.7 \pm 0.9 \pm 0.2) \times 10^{-3}, \end{equation*} where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the $\varphi \to K^{+}{K}^{-}$ branching fraction.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2018-040.html

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Cited by in corpus (2)

• First Lattice QCD determination of semileptonic decays of charmed-strange baryons ${\Xi }_c$
• First measurements of the branching fractions for the decay modes ${\Xi }_c^0\to \Lambda \eta$ and ${\Xi }_c^0\to \Lambda {\eta }^{\prime }$ and search for the decay ${\Xi }_c^0\to \Lambda {\pi }^0$ using Belle and Belle II data