Search

Using a relativized diquark model Hamiltonian, we calculate the masses of J PC = 0 + + ground-state tetraquarks in the following systems: b s b ¯ s ¯ , b b n ¯ n ¯ ( n = u , d ), b b s ¯ s ¯ , c c c ¯ c ¯ , b b b ¯ b ¯ , b c b ¯ c ¯ and b b c ¯ c ¯ . We also compute extensive spectra for the fully-heavy quark flavour combinations. Finally, as a test of the diquark model approach, we compute the masses of fully-heavy baryons in the diquark model. Our results may be compared soon to the forthcoming experimental data for fully-heavy three-quark systems. [ABSTRACT FROM AUTHOR]

The observation of five Ω c = ssc states by LHCb [Aaij et al. Phys. Rev. Lett. 118, 182001 (2017)] and the confirmation of four of them by Belle [Yelton et al. Phys. Rev. D 97, 051102 (2018)], may represent an important milestone in our understanding of the quark organization inside hadrons. By providing results for the spectrum of Ω c baryons and predictions for their Ξ c + K - and Ξ c ′ + K - decay amplitudes within an harmonic oscillator based model, we suggest a possible solution to the Ω c quantum number puzzle and we extend our mass and decay width predictions to the Ω b states. Finally, we discuss why the set of Ω c (b) baryons is the most suitable environment to test the validity of three-quark and quark–diquark effective degrees of freedom. [ABSTRACT FROM AUTHOR]

We recall the diquark model of baryons and tetraquark states in both quark models and Schwinger–Dyson equations based on the diquark model. We slightly discuss the connection between quark models and the contact interaction model based on the Schwinger–Dyson and Bethe–Salpeter equations approach. Finally, by adopting the quark models ideas in the tetraquark picture, we calculate a mass value for the b b b ¯ b ¯ of 18.44 GeV. [ABSTRACT FROM AUTHOR]