Zcs, Zc and Zb states under the complex scaling method

We investigate the Z(b), Z(c) and Z(cs) states within the chiral effective field theory framework and the S-wave single channel molecule picture. With the complex scaling method, we accurately solve the Schrodinger equation in momentum space. Our analysis reveals that the Z(b)(10610), Z(b)(10650), Z(c)(3900) and Z(c)(4020) states are the resonances composed of the S-wave (B (B) over bar* + B*B (B) over bar)/root 2, B*B (B) over bar*, (D (D) over bar*+D*(D) over bar)root 2 and D*(D) over bar*, respectively. Furthermore, although the Z(cs)(3985) and Z(cs)(4000) states exhibit a significant difference in width, these two resonances may originate from the same channel, the S-wave (D-s(D) over bar*+D-s*(D) over bar)/root 2. Additionally, we find two resonances in the S-wave D-s*(D) over bar* channel, corresponding to the Z(cs)(4123) and Z(cs)(4220) states that await experimental confirmation.

Automated summary

In this study, we investigated the Z(b), Z(c), and Z(cs) states using the chiral effective field theory framework and the S-wave single channel molecule picture. By solving the Schrodinger equation in momentum space with the complex scaling method, we found that the Z(b)(10610), Z(b)(10650), Z(c)(3900), and Z(c)(4020) states are resonances composed of different combinations of particles, while the Z(cs)(3985) and Z(cs)(4000) states may originate from the same channel. Additionally, we discovered two resonances in the S-wave D-s*(D) over bar* channel, corresponding to the Z(cs)(4123) and Z(cs)(4220) states that require experimental confirmation.