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Observation of an exotic narrow doubly charmed tetraquark

The LHCb collaboration
CERN-EP-2021-165, 2021.

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.

  • Fig 1

    Fig. 1 of the LHCb-PAPER-2021-031

    10.17182/hepdata.114869.v1/t1

    Distribution of $D^0 D^0 \pi^+$ mass where the contribution of the non-$D^0$ background has been statistically subtracted. Uncertainties on the...

  • Fig 1 unbinned

    Fig. 1 of the LHCb-PAPER-2021-031

    10.17182/hepdata.114869.v1/t2

    Distribution of $D^0 D^0 \pi^+$ mass where the contribution of the non-$D^0$ background has been statistically subtracted by assigning the...

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