𝑋(1870) and 𝜂₂(1870): Which Can Be Assigned as a Hybrid State?

Table 4

The masses predicted for 𝜂_𝐻(0⁺0⁻⁺), 𝑓_𝐻(0⁺1⁺⁺) and 𝜂_𝐻(0⁺2⁻⁺) hybrid states in [11–15].

States	𝜂𝐻(0^+0^−+)	𝑓𝐻(0^+1^++)	𝜂𝐻(0^+2^−+)
Bag [11, 12]	1.3	Heavier	1.9
Flux tube [13, 14]	1.7~1.9	1.7~1.9	1.7~1.9
Constituent gluon [15]	1.8~2.2	1.3~1.8	1.8~2.2