Observation of an exotic narrow doubly charmed tetraquark

( 2700 ) a charmed tetraquark state ?

In this article, we take the point of view that the Ds(2700) be a tetraquark state, which consists of a scalar diquark and a vector antidiquark, and calculate its mass with the QCD sum rules. The numerical result indicates that the mass of the vector charmed tetraquark state is about MV = (3.75±0.18)GeV or MV = (3.71 ± 0.15)GeV from different sum rules, which is about 1GeV larger than the exper...

First Observation of Doubly Charmed Baryons The SELEX Collaboration

M.A. Moinester, G. Alkhazov, A.G. Atamantchouk, M.Y. Balatz, N.F. Bondar, P.S. Cooper, L.J. Dauwe, G.V. Davidenko, U. Dersch, A.G. Dolgolenko, G.B. Dzyubenko, R. Edelstein, L. Emediato, A.M.F. Endler, J. Engelfried, I. Eschrich , C.O. Escobar, A.V. Evdokimov, I.S. Filimonov , F.G. Garcia, M. Gaspero, I. Giller, V.L. Golovtsov, P. Gouffon, E. Gülmez, He Kangling, M. Iori, S.Y. Jun, M. Kaya, J. K...

Observation of the Doubly Charmed Baryon Ξ_{cc}^{++}.

A highly significant structure is observed in the Λ_{c}^{+}K^{-}π^{+}π^{+} mass spectrum, where the Λ_{c}^{+} baryon is reconstructed in the decay mode pK^{-}π^{+}. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon Ξ_{cc}^{++}. The difference between the masses of the Ξ_{cc}^{++} and Λ_{c}^{+} states is measured to be 1334.94±0...

Is Ds(2700) a charmed tetraquark state?

In this article, we take the point of view that the Ds(2700) be a tetraquark state, which consists of a scalar diquark and a vector antidiquark, and calculate its mass in the framework of the QCD sum rules approach. The numerical result indicates that the mass of the vector charmed tetraquark state is about MV = 3.75GeV, which is about 1GeV larger than the experimental data. If there are some t...

Spectroscopy of doubly charmed baryons: