Role of Form Factor in Relativistic Hartree-Fock Approach for Finite Nuclei

We study the role of the form factor in meson exchange interactions within the relativistic Hartree-Fock (RHF) approach. We calculate finite nuclei properties with different cutoff parameters in sigma and omega exchange interactions, and find that the results are quite sensitive to the choice of the cutoff parameters. It is essential to include the form factors in the one-boson-exchange potential (OBEP) model, also the form factor can change the single-particle spectra of nuclei. We discuss the different treatment of the pi-pseudovector coupling and rho-tensor coupling in the RHF model. It is found that the results with the form factors are different from those without the form factors and with the delta-function pieces, while the removal of the delta-function pieces can dramatically alter the contributions from pi and rho exchanges.