First Observation of a Doubly Charged Tetraquark and Its Neutral Partner. - Aaij R; Abdelmotteleb ASW; Abellan Beteta C; Abudinén F; Ackernley T; Adeva B; Adinolfi M; Adlarson P; Afsharnia H; Agapopoulou C; Aidala CA; Aiola S; et al. (Physical review letters, 2023)