Observation of an exotic narrow doubly charmed tetraquark

The LHCb collaboration
Aaij, Roel , Abdelmotteleb, Ahmed Sameh Wagih , Abellán Beteta, Carlos , Abudinen Gallego, Fernando Jesus , Ackernley, Thomas , Adeva, Bernardo , Adinolfi, Marco , Afsharnia, Hossein , Agapopoulou, Christina , Aidala, Christine Angela
Nature Phys. 18 (2022) 751-754, 2022.

Abstract
Conventional hadronic matter consists of baryons and mesons made of three quarks and quark-antiquark pairs, respectively. The observation of a new type of hadronic state, a doubly charmed tetraquark containing two charm quarks, an anti-$u$ and an anti-$d$ quark, is reported using data collected by the LHCb experiment at the Large Hadron Collider. This exotic state with a mass of about 3875 MeV$/c^2$ manifests itself as a narrow peak in the mass spectrum of $D^0D^0\pi^+$ mesons just below the $D^{*+}D^0$ mass threshold. The near threshold mass together with a strikingly narrow width reveals the resonance nature of the state.

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