Tetraquark states with open flavors

On tetraquark meson states

It is suggested that the narrow meson state seen in the the SELEX experiment is a (cs̄ss̄) tetraquark state. Characteristics of other possible tetraquarks formed out of c and s quarks and antiquarks are considered. SELEX experiment has reported [1] a puzzling narrow meson state at a mass of 2632.6± 1.6 MeV/c which decays preferentially to D s (cs̄) + η(548) rather than to D(cd̄)+K or D(cū)+K. In th...

Quantum Chromodynamics with Many Flavors∗)

We investigate the phase structure of lattice QCD for general number of flavors NF . Based on numerical data combined with the results of the perturbation theory we propose the following picture: When NF ≥ 17, there is only one IR fixed point at vanishing gauge coupling, i.e., the theory in the continuum limit is trivial. On the other hand, when 16 ≥ NF ≥ 7, there is a non-trivial fixed point. ...

Lattice QCD with 2+1 Flavors and Open Boundaries: First Results of the Baryon Spectrum

Mass spectrum of the scalar hidden charmed and bottomed tetraquark states

In this article, we study the mass spectrum of the scalar hidden charmed and bottomed tetraquark states with the QCD sum rules. The numerical results are compared with the corresponding ones from the potential quark model. PACS number: 12.39.Mk, 12.38.Lg

Mass spectrum of the scalar hidden charm and bottom tetraquark states

In this article, we study the mass spectrum of the scalar hidden charm and bottom tetraquark states with the QCD sum rules. The numerical results are compared with the corresponding ones from a relativistic quark model based on a quasipotential approach in QCD. The relevant values from the constituent diquark model based on the constituent diquark masses and the spin-spin interactions are also ...