Selecting the newly observed Ξ b (6227) − by LHCb as a study example, we decode its inner structure by giving the mass spectrum analysis and the investigation of its two-body strong decay behaviors. Our result indicates that the Ξ b (6227) − is a good candidate of the P-wave Ξ ′ b state with J P = 3/2 − or 5/2 − . In addition, we further provide the information of the properties of the partners of the Ξ b (6227) − . These predicted states include three 2S states and the remaining 1P states in the bottom-strange baryon family. The calculated sizable Okubo-Zweig-Iizuka−allowed decay widths of these partners show that the experimental search for them becomes possible via LHCb. We have a reason to believe that the present study can be treated as a start point for constructing the highly excited bottom baryon spectroscopy.
Possible 2S and 1D excited D and D s states are studied, the charmed states Dð2550Þ 0 , D Ã ð2600Þ, Dð2750Þ 0 , and D Ã ð2760Þ newly observed by the BABAR Collaboration are analyzed. The masses of these states are explored within the Regge trajectory phenomenology, and the strong decay widths are computed within the heavy-quark effective theory. Both the mass and the decay width indicate that Dð2550Þ 0 is a good candidate for 2 1 S 0 . The strong decay property of D Ã ð2600Þ and D Ã s1 ð2700Þ AE is described well by pure 2 3 S 1 states. If a mixing between 2 3 S 1 and 1 3 D 1 does exist, the mixing angle is not large and 2 3 S 1 is predominant. D Ã ð2760Þ and D Ã sJ ð2860Þ AE are possibly the 1 3 D 3 D, and D s , respectively. Dð2750Þ 0 and D Ã ð2760Þ seem two different states, and Dð2750Þ 0 is very possibly the 1Dð2 À ; 5 2 Þ though the possibility of 1Dð2 À ; 3 2 Þ has not been excluded. There may exist an unobserved meson D sJ ð2850Þ AE corresponding to D Ã sJ ð2860Þ AE .
Diquarks with J P = 0 ± , 1 ± containing a heavy (charm or bottom) quark and a light quark are investigated using QCD Laplace sum rules. Masses are determined using appropriately constructed gauge invariant correlation functions, including for the first time next-to-leading order perturbative contributions. The J P = 0 + and 1 + charm-light diquark masses are respectively found to be 1.86 ± 0.05 GeV and 1.87 ± 0.10 GeV, while those of the 0 + and 1 + bottom-light diquarks are both determined to be 5.08±0.04 GeV. The sum rules derived for heavy-light diquarks with negative parity are poorly behaved and do not permit unambiguous mass predictions, in agreement with previous results for negative parity light diquarks. The scalar and axial vector heavy-light diquark masses are degenerate within uncertainty, as expected by heavy quark symmetry considerations. Furthermore, these mass predictions are in good agreement with masses extracted in constituent diquark models of the tetraquark candidates X(3872) and Y b (10890). Thus these results provide QCD support for the interpretation of the X(3872) and Y b (10890) as J P C = 1 ++ tetraquark states composed of diquark clusters. Further implications for tetraquarks among the heavy quarkonium-like XYZ states are discussed.
Hadronic decay widths of the newly observed charmed strange baryons, Ωc(3000) 0 , Ωc(3050) 0 , Ωc(3066) 0 , Ωc(3090) 0 and Ωc(3119) 0 have been calculated in a 3 P0 model. Our results indicate that Ωc(3066) 0 and Ωc(3090) 0 can be interpreted as the 1P −wave Ωc2( 3
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