Studies of charmed baryons at LHCb

TL;DR

This study searches for the doubly charmed baryon $\\Xi_{cc}^{+}$ in proton-proton collisions at 7 TeV but finds no significant signal, setting upper limits on its production rate relative to $\\Lambda_{c}^{+}$.

Contribution

First search for the doubly charmed baryon $\\Xi_{cc}^{+}$ at LHCb with new upper limits on its production cross section ratio.

Findings

No significant signal observed in the mass range 3300-3800 MeV/c^2.

Upper limits on production ratio R are set at 1.5×10^{-2} for 100 fs lifetime.

Upper limits on R are 3.9×10^{-4} for 400 fs lifetime.

Abstract

We report a search for the doubly charmed baryon $\Xi_{cc}^{+}$ through the decay $\Xi_{cc}^{+} \to \Lambda_{c}^{+} K^{-} \pi^{+}$, using a data sample corresponding to an integrated luminosity of $0.65~\mathrm{pb^{-1}}$ of $pp$ collisions at $\mathrm{\sqrt{s}} = 7~\mathrm{TeV}$. In the mass range 3300-3800$~\mathrm{MeV}/c^{2}$ no significant signal is observed. Upper limits at $95\%$ confidence level are set on $R$, the ratio of the production cross section of the $\Xi_{cc}^{+}$ times the relevant branching fraction over the $\Lambda_{c}^{+}$ cross section, as a function of the $\Xi_{cc}^{+}$ mass and lifetime. The largest upper limits on $R$ over the investigated mass range are $R<1.5\times10^{-2}$ for a lifetime of $100~\mathrm{fs}$ and $R<3.9\times10^{-4}$ for a lifetime of $400~\mathrm{fs}$.