First Observation of the B[over ¯]_{s}^{0}→Λ_{c}^{+}Λ[over ¯]_{c}^{-} Decay and Evidence for the B[over ¯]^{0}→Λ_{c}^{+}Λ[over ¯]_{c}^{-} Decay. - Aaij R; Abdelmotteleb ASW; Abellan Beteta C; Abudinén F; Ackernley T; Adefisoye AA; Adeva B; Adinolfi M; Adlarson P; Agapopoulou C; Aidala CA; Ajaltouni Z; et al. (Physical review letters, 2026)