Speaker
Description
We present a lattice QCD study of $DD_s$ scattering in the $J^P = 0^+$ channel employing a newly proposed finite-volume Hamiltonian method using the Lippmann-Schwinger equation formulated in the plane-wave basis. This novel approach provides a direct way to analyze two-hadron interacting systems without relying on the traditional Lüscher formalism formulated in the partial-wave basis. From the extracted finite-volume spectra, we studied the scattering amplitude to look for any hadron pole in the near-threshold region. We observe small, non-zero shifts in the simulated finite-volume interacting energy levels compared to the non-interacting levels, which indicates a nontrivial interaction between D and $D_s$ mesons in the channel of our interest. However, the extracted S-wave amplitude confirms no hadron pole in the near-threshold region. These findings provide new insight into heavy-meson dynamics. Also, they highlight the use of the plane-wave-based formalism as a complementary approach to study multi-hadron spectra in lattice QCD.
