Ab Initio Approach to the Non-Perturbative Scalar Yukawa Model
Karmanov, V. A.
Vary, J. P.
- Publisher: Elsevier
Physics letters B,
(issn: 0370-2693, eissn: 1873-2445)
Nuclear Theory | Fock sector dependent renormalization | Physics | High Energy Physics - Theory | Light front Hamiltonian | QC1-999 | Scalar Yukawa model | Nuclear and High Energy Physics
We report on the first non-perturbative calculation of the scalar Yukawa model in the single-nucleon sector up to four-body Fock sector truncation (one "scalar nucleon" and three "scalar pions"). The light-front Hamiltonian approach with a systematic non-perturbative renormalization is applied. We study the $n$-body norms and the electromagnetic form factor. We find that the one- and two-body contributions dominate up to coupling $\alpha \approx 1.7$. As we approach the coupling $\alpha \approx 2.2$, we discover that the four-body contribution rises rapidly and overtakes the two- and three-body contributions. By comparing with lower sector truncations, we show that the form factor converges with respect to the Fock sector expansion.