Decoding the X (5568 ) as a Fully Open-Flavor s u b ¯ d ¯ Tetraquark State
Abstract
We investigate the recent evidence for a charged X (5568 ) meson as an exotic open-flavor tetraquark state s u b ¯d ¯ with JP=0+/1+ in the framework of QCD sum rules. We use the color antisymmetric [3¯ c]s u⊗[3c]b ¯ d ¯ tetraquark currents in both scalar and axial-vector channels to perform evaluations and numerical analyses. Our results imply that the X (5568 ) can be interpreted as both the scalar s u b ¯d ¯ tetraquark state and the axial-vector one, which are in good agreement with the experimental measurement. We also discuss the possible decay patterns of the X (5568 ) and suggest to search for its neutral partner in the radiative decay into Bs0γ and Bs*γ , which can be used to determine its spin-parity quantum numbers. Moreover, we predict its charmed partner state around 2.55 GeV with the quark content s u c ¯d ¯ and JP=0+/1+.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 2016
- DOI:
- 10.1103/PhysRevLett.117.022002
- arXiv:
- arXiv:1602.08916
- Bibcode:
- 2016PhRvL.117b2002C
- Keywords:
-
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment;
- High Energy Physics - Lattice;
- Nuclear Experiment
- E-Print:
- 6 pages, 2 figures. Accepted by Phys. Rev. Lett