Regular Article - Theoretical Physics
Fully open-flavor tetraquark states and with
School of Physics, Sun Yat-Sen University, Guangzhou, 510275, China
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Accepted: 15 April 2020
Published online: 8 May 2020
We have studied the masses for fully open-flavor tetraquark states and () with quantum numbers . We systematically construct all diquark–antiquark interpolating currents and calculate the two-point correlation functions and spectral densities in the framework of QCD sum rule method. Our calculations show that the masses are about GeV for the tetraquark states and GeV for the tetraquarks. The masses of tetraquarks are below the thresholds of and final states for the scalar and axial-vector channels respectively. The tetraquark states with lie below the and thresholds. Such low masses for these possible tetraquark states indicate that they can only decay via weak interaction and thus are very narrow and stable.
© The Author(s), 2020