We study tetraquark resonances with lattice QCD potentials computed for a static b̄b̄ pair in the presence of two lighter quarks ud, the Born-Oppenheimer approximation and the emergent wave method. As a proof of concept we focus on the system with isospin I = 0, but consider different relative angular momenta l of the heavy quarks b̄b̄. For l = 0 a bound state has already been predicted with quantu...

In this article, we take the point of view that the charmed scalar meson Ds0(2317) be a tetraquark state and devote to calculate its mass within the framework of the QCD sum rules approach in the heavy quark limit. The numerical values for the mass of the Ds0(2317) are consistent with the experimental data, there must be some tetraquark component in the scalar meson Ds0(2317). Detailed discussi...

In this article, we take the point of view that the charmed scalar meson Ds(2317) be a tetraquark state and calculate its mass within the framework of the QCD sum rules approach in the heavy quark limit. The numerical values for the mass of the Ds(2317) are consistent with the experimental data. There must be some tetraquark component in the Ds(2317) state. PACS number: 12.38.Aw, 12.38.Qk

The recently observed Y(4260) lies far above the decay threshold with a width less than 100 MeV. We argue that it’s very difficult to accommodate Y(4260) as a conventional cc̄ radial excitation or a D-wave state. It can’t be a hadronic molecule. Its production mechanism and special decay pattern do not favor the glueball interpretation. If Y(4260) is a scalar tetraquark, it must be produced by t...

In this article, we assume that the mesons in the πχc1 invariant mass distribution are scalar hidden charmed tetraquark states and study their masses with the QCD sum rules. The numerical result indicates that the mass is about MZ = (4.19 ± 0.17)GeV, which is consistent with the experimental data. The hidden charmed mesons Z1 and Z2 may be tetraquark states, other possibilities, such as hadro-c...

In this article, we interpolate the vector hidden charmed tetraquark state with the Cγ5 − Cγμγ5 type current, and calculate its mass with the QCD sum rules. The numerical result indicates that the mass is about MZ = (4.09 ± 0.11)GeV, while the C − Cγμ type interpolating current leads to the mass aboutMZ = (4.22±0.10)GeV; they are consistent with the experimental data on the πχc1 invariant mass ...

We discuss the likely tetraquark interpretation of the X(1576) KK isovector resonance recently reported by BES with J = 1. We point out that if this interpretation as a four-quark state is correct, the sus̄d̄ tetraquark decays might have striking signatures. We also provide predictions for possible analogous tetraquarks involving heavy quarks – cqc̄q̄ and bqb̄q̄. e-mail: [email protected] e-mail...

Recently it has been argued that a three-body colour confinement interaction can affect the stability condition of a three-quark system and the spectrum of a tetraquark described by any constituent quark model. Here we discuss the role of a three-body colour confinement interaction in a simple quark model and present some of its implications for the spectra of baryons, tetraquarks and six-quark...

The observed mass pattern of scalar resonances below 1 GeV gives preference to the tetraquark assignment over the conventional q̄q assignment for these states. We present a search for tetraquarks with isospins 0, 1/2, 1 in lattice QCD, where the isospin channels 1/2 and 1 have not been studied before. We determine three energy levels in each isospin channel using the variational method. The scat...

In this article, we take the point of view that the charmed scalar meson Ds0(2317) be a tetraquark state and devote to calculate its mass within the framework of the QCD sum rules approach in the heavy quark limit. The numerical values for the mass of the Ds0(2317) are consistent with the experimental data, there must be some tetraquark component in the scalar meson Ds0(2317). Detailed discussi...