Observation of \chi_{cJ} decaying into the p\bar{p}K^{+}K^{-} final state

First measurements of the decays of the three ${\chi }_{cJ}$ states to $p\bar{p}{K}^{+}{K}^{-}$ final states are presented. Intermediate $\phi\to K^{+}K^{-}$and$\Lambda(1520)\to pK^{-}$ resonance states are observed, and branching fractions for ${\chi }_{cJ}\to \bar{p}{K}^{+}\mathrm{\Lambda }(1520)$, $\mathrm{\Lambda }(1520)\bar{\mathrm{\Lambda }}(1520)$, and $\varphi p\bar{p}$ are reported. We also measure branching fractions for direct ${\chi }_{cJ}\to p\bar{p}{K}^{+}{K}^{-}$ decays. These are first observations of ${\chi }_{cJ}$ decays to unstable baryon resonances and provide useful information about the ${\chi }_{cJ}$ states. The experiment uses samples of ${\chi }_{cJ}$ mesons produced via radiative transitions from 106 million ${\psi }^{\mathrm{\prime }}$ mesons collected in the BESIII detector at the BEPCII $e^{+}{e}^{-}$ collider.