2021/09/02 by LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +994 · 1 voice
Physics and Astronomy · #hep-ex
paper · pdf · doi:10.1038/s41567-022-01614-y
arxiv published 2021/09/02 · arxiv updated 2022/06/16
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/c2 manifests itself as a narrow peak in the mass spectrum of D0D0π+ mesons just below the D*+D0 mass threshold. The near threshold mass together with a strikingly narrow width reveals the resonance nature of the state.