Observation of New Baryons in the Ξ_{b}^{-}π^{+}π^{-} and Ξ_{b}^{0}π^{+}π^{-} Systems. - Aaij R; Abdelmotteleb ASW; Abellan Beteta C; Abudinén F; Ackernley T; Adeva B; Adinolfi M; Adlarson P; Afsharnia H; Agapopoulou C; Aidala CA; Ajaltouni Z; et al. (Physical review letters, 2023)