First determination of the spin-parity of Ξ_{c}(3055)^{+,0} baryons

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 measurement is performed using proton-proton collision data at a center-of-mass energy of \sqrt{s}=13\,\text{TeV}, corresponding to an integrated luminosity of 5.4\,\text{fb}^{-1}, recorded by the~\text{LHCb} experiment between 2016 and 2018. The spin-parity... Show more