Weak decays of stable doubly heavy tetraquark states

Abstract

In the light of the recent discovery of the Ξ ++ cc by the LHCb collaboration, we study the stable doubly heavy tetraquarks. These states are compact exotic hadrons which can be approximated as the diquark-anti-diquark correlations. In the flavor SU(3) symmetry, they form a SU(3) triplet or anti-sextet. The spectra of the stable doubly heavy tetraquark states are predicted by Sakharov-Zeldovich formula. We find that the T − bbūd (3) is about 73MeV below the BB * threshold at SET I. We then study the semileptonic and nonleptonic weak decays of the stable doubly heavy tetraquark states. The doubly heavy tetraquark decay amplitudes are parametrized in terms of flavor SU(3)irreducible parts. Ratios between decay widths of different channels are also derived. At the end, we collect the Cabibbo allowed two-body and three-body decay channels, which are most promising to search for the stable doubly heavy tetraquark states at LHCb and Belle II experiments.

Analyzing doubly heavy tetra- and penta-quark states by variational method

“…Of this Hamitonian, the first term includes the mass and kinetic energy of individual quarks; the second term shows the color Coulomb interaction; the third one is the color linear confining term with an unknown coefficients b i ; the fourth and the fifth ones are spin-dependent and orbital excited terms as in Refs. [32][33][34][35][36]. Therein, the spin-dependent term can be expressed here mean up and down quarks, of which the isospin symmetry is satisfied.…”

Weak decays of the axial-vector tetraquark Tbb;u¯d¯Agaev1, Azizi2, Barsbay3 et al. 2019Phys. Rev. D481401View full textAdd to dashboardCite

“…In light of recent progress made in the physics of double-heavy tetraquarks and the expected stability of the T − bb;ud state, its weak decays are a very interesting subject for a detailed analysis. The semileptonic decays of four-quark systems-when an initial tetraquark transforms into a final tetraquark and lν l or lν l leptons-are a relatively new topic in the physics of exotic mesons [36,37]. In Ref.…”

Weak decays of triply heavy tetraquarks $${b{\bar{c}}}{b{\bar{q}}}$$

“…• For thec quark non-leptonic decays, the groups are given as • For the b quark non-leptonic decays, the groups are classified as The parameters of the tensors above can be found in Ref. [55,[58][59][60], such as (H 6 ) 2 31 = −(H 6 ) 2 13 = 1 for the transition ofc →sdū. In the following, we will study the possible weak decay modes of T {bb} {cq} in order.…”