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In 2002 the SELEX experiment at @Fermilab reported the observation of the doubly charmed Ξ⁺cc (ccd) baryon (red arrow above). They saw it in two independent processes at a mass of 3520 MeV/c². https://t.co/5S4e5x8do0 https://t.co/Fu3wTAyXQW https://t.co/c…