# A search for $\it{\Xi}^{++}_{cc} \rightarrow D^{+} p K^{-} \pi^{+}$ decays

## TL;DR

This study searches for the doubly charmed baryon $ ext{ extit{ extXi}^{++}_{cc}}$ decaying into $D^{+} p K^{-} \pi^{+}$ using LHCb data but finds no signal, setting upper limits on decay ratios.

## Contribution

First search for $ ext{ extit{ extXi}^{++}_{cc}}$ decaying into $D^{+} p K^{-} \pi^{+}$ with LHCb data, establishing upper limits on decay ratios.

## Key findings

- No significant signal observed in the mass range.
- Upper limit on decay ratio $rac{ ext{Br}( ext{ extit{ extXi}^{++}_{cc}} o D^{+} p K^{-} \pi^{+})}{ ext{Br}( ext{ extit{ extXi}^{++}_{cc}} o ext{ extLambda}^{+}_{c} K^{-} \pi^{+}\pi^{+})}$ set at $<1.7 imes 10^{-2}$ (90% CL).
- Data sample corresponds to 1.7 fb$^{-1}$ at 13 TeV.

## 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. No significant signal is observed in the mass range from the kinematic threshold of the decay to 3800 $\mathrm{MeV}/c^{2}$. 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.