First determination of the spin-parity of ${\Xi }_c(3055{)}^{+,0}$ baryons

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1112

The ${\Xi }_b^{0(-)}\to {\Xi }_c(3055{)}^{+(0)}(\to D^{+(0)}\Lambda ){\pi }^{-}$ decay chains are observed, and the spin-parity of ${\Xi }_c(3055{)}^{+(0)}$ baryons is determined for the first time. The m…