Speaker
Stephen Ogilvy
(University of Glasgow (GB))
Description
An analysis to measure the ratios of the $\Lambda_{c}^{+} \to p^{+} h^{-} h^{+}$, {$h = K, \pi$} $\mathcal{BF}s$ using 2011 LHCb data is presented. Two sources of $\Lambda_{c}^{+}$ are used, those produced promptly and those produced in semileptonic $\Lambda_{b}^{0} \to \Lambda_{c}^{+} \mu^{-} \bar{\nu}$ decays. The analysis includes a search for the hitherto unobserved doubly-Cabibbo-suppressed mode $\Lambda_{c}^{+} \to p^{+} \pi^{-} K^{+}$. The ratios measured are defined as
%\begin{equation*}
$$\frac{\mathcal{BF}_{\Lambda_{c}^{+} \to p^{+} K^{-} K^{+}}}{\mathcal{BF}_{\Lambda_{c}^{+} \to p^{+} K^{-} \pi^{+}}},
\frac{\mathcal{BF}_{\Lambda_{c}^{+} \to p^{+} \pi^{-} \pi^{+}}}{\mathcal{BF}_{\Lambda_{c}^{+} \to p^{+} K^{-} \pi^{+}}},
\frac{\mathcal{BF}_{\Lambda_{c}^{+} \to p^{+} \pi^{-} K^{+}}}{\mathcal{BF}_{\Lambda_{c}^{+} \to p^{+} K^{-} \pi^{+}}}.$$
%\end{equation*}
Aside from the obvious interest in observing a new decay mode, the $\mathcal{BF}s$ of the Cabibbo-suppressed modes are currently poorly constrained, with errors of the order of 50\% on their PDG values. A multivariate $\Lambda_{c}^{+}$ selection and daughter particle identification are used to select candidates. The treatment of efficiencies, systematics and current status of the measurements are presented.
Authors
Patrick Spradlin
(University of Glasgow (GB))
Paul Soler Jermyn
(University of Glasgow (GB))
Thomas Ruf
(CERN)
