Analysis of the η1(1855) as a KK¯1(1400) molecular state

In this work, we study the radiative and strong decay of S-wave KK¯1(1400) molecular state within the effective Lagrangians approach and find the relation between the KK¯1(1400) molecular state and the newly observed η1(1855) state by comparing with the BESIII observation. The prediction indicates that the decay width can reach up to 195.06−5.13+5.18 MeV, which can be confronted with the experimental data. If the η1(1855) could be S-wave KK¯1(1400) molecular state, the KK¯⁎π three-body decay provides the dominant contribution, not the ηη′ channel found in the experiment. In addition, the partial width for η1(1855)→γϕ can reach up to 17.67−0.62+0.38 KeV. Those results can be measured in future experiments and used to test the nature of the η1(1855).