First Observation of the Charmless Baryonic Decay B^(+)→Λ[over ¯]pp[over ¯]p. - 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. (Phys Rev Lett, 2025)