# A search for $\Xi_{cc}^{++}\to D^+pK^-\pi^+$ decays

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## Abstract

A search for the $\it{\Xi}^{++}_{cc}$ baryon through the $\it{\Xi}^{++}_{cc} \rightarrow D^{+} p K^{-} \pi^{+}$ decay is performed with a data sample corresponding to an integrated luminosity of 1.7 $\mathrm{fb}^{-1}$ recorded by the LHCb experiment in $pp$ collisions at a centre-of-mass energy of 13 TeV. An upper limit is set on the ratio of branching fractions $\mathcal{R} = \frac{\mathcal{B}(\it{\Xi}^{++}_{cc} \rightarrow D^{+} p K^{-} \pi^{+})}{\mathcal{B}(\it{\Xi}^{++}_{cc} \rightarrow \Lambda^{+}_{c} K^{-} \pi^{+}\pi^{+})}$ with $\mathcal{R} < 1.7 \hspace{2pt} (2.1) \times 10^{-2}$ at the 90% (95%) confidence level at the known mass of the $\it{\Xi}^{++}_{cc}$ state. No significant signal is observed in the mass range 3300-3800 $\mathrm{MeV}/c^{2}$.

## Figures and captions

 The Feynman diagram contributing to the inclusive (left) $\Xi _{ c c }^{++}\rightarrow D ^+ p K ^- \pi ^+$ decay with the analogous (right) $\Xi _{ c c }^{++}\rightarrow \Lambda _ c ^+ K ^- \pi ^+ \pi ^+$ diagram. pub-Dp[..].pdf [20 KiB] HiDef png [138 KiB] Thumbnail [82 KiB] *.C file pub-Lc[..].pdf [20 KiB] HiDef png [145 KiB] Thumbnail [88 KiB] *.C file Invariant-mass distribution of the $D ^+$ candidates after the analysis selection. The black points represent data. Overlaid is the fit to data which is indicated by the continuous (blue) line with the individual signal and background components of the fit represented by the dotted (red) line and dashed (green) line, respectively. pub-Dp[..].pdf [25 KiB] HiDef png [322 KiB] Thumbnail [281 KiB] *.C file Invariant-mass distribution of the $\Xi _{ c c }^{++}$ candidates from the (left) ${\Xi _{ c c }^{++}\rightarrow D ^+ p K ^- \pi ^+ }$ and the (right) ${\Xi _{ c c }^{++}\rightarrow \Lambda _ c ^+ K ^- \pi ^+ \pi ^+ }$ sample with the fit result overlaid. The black points represent data. In the left plot, the two vertical parallel dashed (blue) lines define the region where the signal is expected and the continuous (green) line represents the combinatorial background. In the right plot, the dashed (green) line represents combinatorial background, the dotted (red) line represents the signal contribution and the continuous (blue) line is the total fit. pub-Xi[..].pdf [20 KiB] HiDef png [246 KiB] Thumbnail [216 KiB] *.C file pub-Lc[..].pdf [22 KiB] HiDef png [292 KiB] Thumbnail [244 KiB] *.C file Invariant-mass distributions of right-sign (black) $D ^+ p K ^- \pi ^+$, wrong-sign-plus (red) $D ^+ p K ^+ \pi ^+$ and wrong-sign-minus (blue) $D ^+ p K ^- \pi ^-$ data combinations are shown. The control samples have been normalised to the right-sign sample. pub-co[..].pdf [22 KiB] HiDef png [289 KiB] Thumbnail [245 KiB] *.C file The scores from the \texttt{CLs} method for each value of the assumed ratio of branching fractions $\mathcal{R}$. Observed values are shown by the solid black line. The set upper limits at 90% and 95% CL are indicated by the dotted (blue) line and the dashed (red) line, respectively. pub-Cls-R.pdf [16 KiB] HiDef png [123 KiB] Thumbnail [115 KiB] *.C file Animated gif made out of all figures. PAPER-2019-011.gif Thumbnail

## Tables and captions

 Systematic uncertainties on the single-event sensitivity $\alpha_{s}$. Table_1.pdf [31 KiB] HiDef png [135 KiB] Thumbnail [56 KiB] tex code

Created on 17 August 2019.Citation count from INSPIRE on 20 August 2019.