Precision measurement of the Ξcc++ mass

Abstract

A measurement of the ${\Xi }_{\mathit{cc}}^{++}$ mass is performed using data collected by the LHCb experiment between 2016 and 2018 in pp collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.6 fb⁻¹. The ${\Xi }_{\mathit{cc}}^{++}$ candidates are reconstructed via the decay modes ${\Xi }_{\mathit{cc}}^{++}\to {\Lambda }_c^{+}{K}^{-}{\pi }^{+}{\pi }^{+}$ and ${\Xi }_{\mathit{cc}}^{++}\to {\Xi }_c^{+}{\pi }^{+}$. The result, 3621.55 ± 0.23 (stat) ± 0.30 (syst) MeV/c², is the most precise measurement of the ${\Xi }_{\mathit{cc}}^{++}$ mass to date.