2019/12/31 by Hee-Jin Kim, Hee‐Jin Kim, Hyun-Chul Kim
Physics and Astronomy · #Amplitude #Coupling (piping) #Coupling constant #High-Energy Particle Collisions Research #Lattice QCD #Meson #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #hep-ex #hep-lat #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevd.102.014026
published as Phys. Rev. D 102, 014026 (2020) · 19 pages. 10 figures. Discussion part was revised
openalex created_date 2020/05/29 · arxiv created 2020/06/18 · openalex publication_date 2020/07/16 · arxiv updated 2020/07/22 · openalex updated_date 2026/08/05
We investigate the \ensuremathσ and \ensuremathρ coupling constants for the DD and D*D* interactions, based on correlated 2\ensuremathπ exchange in the DD and D*D* interactions. Starting from the DD\ensuremath→\ensuremathπ\ensuremathπ and D*D*\ensuremath→\ensuremathπ\ensuremathπ amplitudes derived in the pseudophysical region (4m_\ensuremathπ2\ensuremath≤t\ensuremath≤52m_\ensuremathπ2) with the S- and P-wave 2\ensuremathπ correlations considered, we obtain the spectral functions for the DD\ensuremath→DD and D*D*\ensuremath→D*D* amplitude with correlated S- and P-wave 2\ensuremathπ exchanges. Using the pole approximation, we estimate the DD\ensuremathσ, DD\ensuremathρ, D*D*\ensuremathσ, and D*D*\ensuremathρ coupling constants. We extended phenomenologically the present results to the region in t\ensuremath≤0 and compare them with those from lattice QCD. The results are also compared with those of other models. We also present the results of the BB\ensuremathσ, BB\ensuremathρ, B*B*\ensuremathσ, and B*B*\ensuremathρ coupling constants. We observe that it is unlikely that the \ensuremathσ and \ensuremathρ coupling constants for the B and B* mesons are the same as those for the D and D* mesons. On the contrary, they are quite larger than those for the charmed mesons.