Fully open-flavor tetraquark states [Formula omitted] and [Formula omitted] with [Formula omitted]

• Published in: The European physical journal. C, Particles and fields Vol. 80; no. 5
• Main Authors: Wang, Qi-Nan, Chen, Wei
• Format: Journal Article
• Language: English
• Published: Springer 08.05.2020
• Subjects: Specific gravity
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-020-7938-2

We have studied the masses for fully open-flavor tetraquark states [Formula omitted] and [Formula omitted] ( [Formula omitted]) with quantum numbers [Formula omitted]. 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 [Formula omitted] GeV for the [Formula omitted] tetraquark states and [Formula omitted] GeV for the [Formula omitted] tetraquarks. The masses of [Formula omitted] tetraquarks are below the thresholds of [Formula omitted] and [Formula omitted] final states for the scalar and axial-vector channels respectively. The [Formula omitted] tetraquark states with [Formula omitted] lie below the [Formula omitted] and [Formula omitted] 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.