First observation of the doubly charmed baryon decay $\Xi_{cc}^{++}\rightarrow \Xi_{c}^{+}\pi^{+}$

TL;DR

This paper reports the first observation of the decay of the doubly charmed baryon ^{++} into ^{+}\u03c0^{+}, confirming previous findings and measuring its mass and branching ratios with high statistical significance.

Contribution

The paper provides the first experimental observation of the ^{++} ^{+}c^{+} decay mode, including precise measurements of its mass and decay branching ratios.

Findings

Decay observed with 5.9 sigma significance.

Mass of ^{++} measured as 3620.6 MeV/c^2.

Branching ratio ratio measured as 0.035.

Abstract

The doubly charmed baryon decay $\Xi_{cc}^{++} \rightarrow \Xi_{c}^{+} \pi^{+}$ is observed for the first time, with a statistical significance of $5.9\sigma$, confirming a recent observation of the baryon in the $\Lambda_c^{+} K^{-} \pi^{+} \pi^{+}$ final state. The data sample used corresponds to an integrated luminosity of $1.7\,\mathrm{fb}^{-1}$, collected by the LHCb experiment in $pp$ collisions at a center-of-mass energy of $13\mathrm{\,Te\kern -0.1em V}$. The $\Xi_{cc}^{++}$ mass is measured to be \begin{equation}\nonumber 3620.6\pm 1.5~(\text{stat})\pm 0.4~(\text{syst}) \pm 0.3~(\Xi_{c}^{+})~\text{MeV}/\it{c}^{2}, \end{equation} and is consistent with the previous result. The ratio of branching fractions between the decay modes is measured to be \begin{equation}\nonumber \frac{\mathcal{B} (\Xi_{cc}^{++} \rightarrow \Xi_{c}^{+} \pi^{+}) \times \mathcal{B}(\Xi_{c}^{+} \rightarrow pK^{-}\pi^{+})} {\mathcal{B} (\Xi_{cc}^{++} \rightarrow \Lambda_c^{+} K^{-} \pi^{+} \pi^{+}) \times \mathcal{B}(\Lambda_c^{+} \rightarrow pK^{-}\pi^{+})} = 0.035\pm 0.009~(\text{stat}) \pm 0.003~(\text{syst}). \end{equation}