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

Table 3

𝑋(1870) calculated in RTs for different states. The masses of 𝜂^′(1475), 𝑓₁(1420), ℎ₁(1380), and 𝜂₂(1645) are taken from PDG [2].

Four possible states for X(1870)
𝜂^′(3^1𝑆0)	𝑓^′1(2^3𝑃1)	𝜂^′2(1^1𝐷2)	𝜂2(2^1𝐷2)
𝜂^′(1475)	𝑓1(1420)	ℎ1(1380)	𝜂2(1645)
𝜇^2=1.34^+0.04−0.03	𝜇^2=1.38^+0.04−0.03	𝛽^2=1.6^+0.06−0.06	𝜇^2=0.91^+0.04−0.03